Chris sighed heavily as he plodded down the path leading out of Hollow Shades, a heavy rucksack over his shoulder. The books inside shifted about as he walked, causing the bag to swing slightly side to side.

Large trees lined the path, their thick foliage high above blocking out most of the sunlight. This left the undergrowth in a constant state of gloom, some parts of the forest so dark that one could not see unassisted. Luckily for Chris, however, his path was illuminated by tall luminescent mushrooms that grew around the bases of some of the older trees.

The strange fungi loomed overhead, their caps glowing softly in the dark in a variety of colors such as differing shades of greens, blues, purples, and pinks. They were the natural street lights of Hollow Shades, and unique to the area—this was the only place in Equestria where they grew naturally.

Chris eyed them as he walked, but it was clear by the glazed look in his eyes that he was zoning out. His gaze drifted absentmindedly over the glowing caps, looking but not really seeing. There was an exhausted air about him, accentuated by the faint bags under his eyes. He swayed slightly as he walked, occasionally stumbling over a stray root or stone.

Of course, that was understandable seeing as he had just finished with several exams at school, all of which he had spent the past few nights studying for. Very little sleep and the stress of passing them had taken its toll on the young man, but now it was over and he had a week off to relax and unwind.

And the first thing on his list was to go home, collapse upon his bed, and become one with the mattress.

Trudging along the path for a few more minutes, Chris made his way towards the outskirts of town. He passed by several homes that were carved into the trunks and lower branches of the trees. Branches were used as walkways between parts of the homes, or, if there wasn’t a branch large enough to support the weight of a pony, a rope bridge was used instead.

The tree houses became more scarce the further he journeyed from town. Soon enough, the buildings stopped as Chris approached a turn in the path. Rounding the bend, the last house on the lane came into view.

Nestled amongst the trees and curtained by branches, the large structure materialized from the darkness. Carved partially into a large steelwood tree, extra rooms had been added here and there until it looked more house-like than a tree. Ivy covered the building in a thick blanket. Rope bridges led into the upper branches, where the branches had been warped and twisted into enclosed living spaces. Dimly lit lanterns hung from the lower branches, casting dancing shadows upon the garden that rested off to the side. Two chimneys framed the structure, jutting out at an angle from the tree.

The house sat on the other side of a small, babbling brook. A simple stone bridge, covered in moss, was the only way across for those who couldn’t fly. A small rock wall ran around the edge of the yard, the short barrier almost completely hidden from view behind the creeping ivy. A few white flowers poked through the sea of creepers.

Chris paused on the far side of the bridge and stared up at the house. It was his home, and had been since he had arrived in Equestria seven years ago. He couldn’t remember how he ended up in this world of talking ponies. All he knew was that he was found wandering the foothills of the Foal Mountains by a woodcutter. Scared, confused, and dressed in only a pair of flimsy pajamas, he was taken to Hollow Shades where, once it was determined by the Princesses that they couldn’t return him to his home, he was adopted into a local family.

For seven years, he had grown up with his new mother and sisters, going to school, and learning about Equestria. Now, at age eighteen and with his last year of school almost over, he had to figure out what exactly he was going to do with his life.

But that was something to worry about later. Right now, he could practically hear his bed calling his name. The sweet siren of sleep was singing to him, and he couldn’t ignore it for long.

Giving the house one last look over, Chris crossed the bridge and headed for the front door. He fished his keys out of his pocket as he climbed the steps to the porch, the old wood creaking beneath his feet. It took a moment for him to get the key in the lock, but when he finally managed to unlock the door, he used his shoulder to push it open. Immediately, the scent of fresh pine and spices wafted from within, followed by a cool breeze from the interior of the house. A small smile touched his lips as he inhaled the aroma—the smell of home.

Chris slipped through the open door before nudging it closed with his foot. Dropping his bags off beside the door, he proceeded to kick off his shoes before shuffling across the living room.

The interior of the house had an earthen feel to it. It was dark, with very little light creeping in through the few windows carved into the trunk. Instead, the rooms were illuminated by flickering lanterns that dangled from the walls and ceilings. The wooden floors bore the distinct concentric rings of a tree’s insides.

The living room itself was circular in shape, with several steel bars running the diameter of the room just below the ceiling. Multiple small bookshelves had been carved into the wall, and were packed full of books of various topics. The rest of the walls were covered in odd drapings, such as tapestries, animal furs, and other odd knickknacks.

A winding staircase ran along the far wall of the room, heading up further into the tree’s interior. Underneath the stairs, an archway led into a small alcove that split into several different directions. One path led into the kitchen, a second opened into a large eating area, and the third spiraled downwards towards the lower levels dug beneath the roots of the tree.

The wooden floor gave way to carpet as Chris headed for the kitchen. He shuffled along, well aware of the static shock that was building up from his socks, but too tired to really care at the moment. After a quick stop in the kitchen to grab a snack, he moved towards the stairs, intending to head up to bed.

He was passing through the alcove out of the kitchen when a sound reached his ears, making him pause. It took him a moment to figure out what it was, but when he did, a puzzled look crossed his face.

From the lower levels, the faint sound of a cello drifted up. Chris listened to it for a moment before slowly making his way down the steps leading to the basement. As he descended, the air got noticeably cooler, which was a nice perk of having your basement dug out of the ground itself. Instead of wood, the walls below were made of weathered stones.

The stairs opened out to a circular room. Roots ran across the ceiling, trailing down the walls to the floor below. Several doors lined the walls, leading to different rooms such as bedrooms, a bathroom, and a cellar. Most were closed, but the door to the den was open a crack, an orange glow issuing forth from within. The music was coming from the other side.

Placing his eye to the crack, Chris peered inside.

The den was a small, cozy room with thick ornate carpets covering the earthy floor. In the corner sat a heavy-set desk with several packed bookshelves resting behind it. A chandelier made of twisted black wood hung from the ceiling. Situated along the far wall was a stone fireplace, though no fire was currently lit. Dozens of picture frames dotted the mantle. The various pieces of carved wooden furniture—chairs, couches, coffee tables—had been pushed along one of the walls, leaving a wide space in the center of the room.

And there, in the middle of the open space, was a batpony filly.

With a coat of light blue, she was one of the rarer batponies born without a dark coat color. Her wavy mane hung down to her shoulders, the silver hair glinting in the light of the flickering lamps. A cutie mark of a moon behind some clouds adorned her flank. Standing on her hind legs, she held a cello in her forehooves. Her tiny wings were spread wide, helping her to keep her balance as she played. A music stand was positioned in front of her, its surface covered in sheet music. However, she wasn’t looking at them, her eyes closed tight.

Swaying side to side, she pulled the bow across the strings with conviction. Music filled the room with each swipe of the hairs, causing the very air to practically thrum. The piece was a slow yet powerful one, the deep notes accentuated by quick flicks to the upper octaves. As the piece continued, the long notes steadily grew faster, but still retained their presence. After a while she started to hum along with her own melody, letting the music consume her.

Chris paused and smiled as he listened to his youngest sister, letting himself get lost in the enchanting music. He was always quite fond of her talents, even if the rest of his ‘unique’ family didn’t appreciate the free concerts as much. It was never really an issue for him, though. Even when she was first discovering her place in life, he would often let her perform for him as an impromptu audience so she could practice and get some honest feedback. However, she was pretty talented in his eyes and his criticisms always seemed to come out as praise, for which she would scold him, as she could never really take a compliment well.

Still, it was strange seeing her home at this hour. He could have sworn she was supposed to be tutoring a few of the new musicians at Eventide’s Elementary School.

The wonderful melody continued for several more measures before one of her hind legs gave an involuntary shiver. The sudden movement broke her from her trance. She gasped and the bow slipped, the action producing a horrible screeching noise.

With that, the music abruptly ended.

“Ugh… not again,” the filly huffed. Her wings fluttered softly as she adjusted her stance. She didn’t start playing again right away, instead taking a few seconds to look over the sheet music before her.

Chris took the moment of silence to make his presence known. Pushing the door open further, he opened his mouth to speak, only for a loud ‘ppppsszzzrt’ to be heard as his finger brushed against the metal door handle.

“Ouch!” Chris yelped, startled as he instinctively cradled his shocked finger.

His sister let out surprised shriek and whirled around, nearly falling over her cello in the process. Upon seeing Chris standing in the doorway, she put a hoof to her chest and breathed a sigh of relief. “Oh, brother. It’s just you.” she huffed, an angry and somewhat frustrated pout crossing her face. “Don’t scare me like that!”

“Sorry, Moonie,” Chris said as he walked into the room, nursing his finger. “Didn’t mean to sneak up on you like that.”

“You almost made me drop my cello,” Blue Moon grumbled as she turned back to her sheet music. “What are you doing home so early anyways?” she asked as she started to play again. The music was soft and gentle, nothing at all like it had been earlier.

Chris raised an eyebrow. “I was actually going to ask you the same thing. I thought you were tutoring somepony after school.”

“It’s the Friday before Estrus Break, dummy. All afterschool activities were cancelled,” Blue Moon said with a hint of venom in her voice. The notes were deeper now, slowly returning to the force and presence they were at when Chris first arrived. Opening a cyan eye, she peered sideways at him. “You still didn’t answer my question.”

“I’m not home early,” Chris said. “I had to stay late to help clean up the science lab. It’s after four.”

This caused Blue Moon to pause in her playing and give him an odd look, but only for a second.

“Is it really that late already?” she asked softly, almost to herself before shrugging. “Time flies, I guess.”

“I was actually going to ask where everypony is,” Chris continued, looking back behind him into the empty house. “I didn’t think the house would be desolate when I got home.”

“Well, I’m here,” Blue Moon told him, smiling slightly. “I believe Moondrop is spending some time with her weird friends. I’m not sure where Dawn is, probably at that... ‘gothic’ store she always goes to. Nocturne and Evening are at the movies, and Penumbra and mother are at work.” She fell quiet as she became more engrossed in her music. Eyes closed, she began to sway again in time with the strokes of her bow.

Chris stood off to the side and watched her play, a small smile touching his lips. Blue Moon was the youngest of the household, a full four years younger than him. However, despite her age, she was one of the more mature members of his adopted family. Or at least she always carried herself that way.

He listened for a few moments before moving to peer over her shoulder in an attempt to see what the name of the piece was. The Reins of Castamare? Never heard of it before.

As he studied the piece, Blue Moon suddenly stiffened, her nostrils flaring. Her eyes snapped open as—once again—one of her hind legs gave an involuntary shiver. And like before, her strokes faltered, causing the bow to drag awkwardly across the strings, producing a high-pitched screeching noise.

“G-gah! Not again!” she growled. A light blush adorned her cheeks, turning the blue fur pink.

Taking a step back, Chris gave her a confused look. “What happened? You were doing so well.”

Blue Moon continued to glare at the music sheets, but her blush deepened.

“I believe I’m currently experiencing my first heat,” she mumbled in frustration, “and I’m finding it rather… distracting.”

“You’re experiencing your fir—” Chris began, only to blink when a faint, spicy scent touched his nose, confirming what she had previously claimed. “O-oh… I, um…” He trailed off, a blush of his own spreading across his face.

“It doesn’t exactly help that you’re here, either. You know, the scent of an adult male and all… it’s making it rather hard to concentrate on my music,” Blue huffed, her tail lashing back and forth in agitation. Taking a steadying breath, she placed the bow back on the strings, only for her leg to give another, more violent twitch. This caused her to groan and hang her head in defeat before grunting angrily, exposing her tiny fangs. “This day has been a complete and total disaster! At this rate I’m never going to be ready for the concerto!”

Having dealt with this before with all his other sisters, Chris knew it was best to just leave them to themselves until they… calmed down. He headed for the door, calling back over his shoulder as he went. “Right, I’ll just go then. If you need me, I’ll be napping in my room. Good luck with your practicing!”

“Right...” Blue said flatly as she tried to set herself up again. She was just about to start playing when something went off in her head, causing her eyes to widen suddenly. “H-hey, wait a second!”

Chris paused with his hand on the door handle. He turned to glance back.

“You know...” She started to say, turning her head slightly, but then pausing.

Chris waited for her to continue for moment before replying with a raised eyebrow. “I know... what?”

“I, umm…” Blue tried to continue as she turned back to her music sheets. She kept up a calm facade, but was obviously struggling to get the words out. “Well, it just occurred to me that... What I mean to say is...” After another pause she sighed and shook her head before straightening herself out again. Her leathery wings quivered, the individual fingers flexing and twitching on their own before she finally managed to collect herself enough. “I might need your help.”

“Help with what?” he asked curiously, not quite following.

“Well, according to Dawn, this isn’t going to go away for a while... at least not by itself.” she said matter-of-factly, still facing away from him. “However, she told me there was a way to… relieve myself faster, but I... I need your help to do it.”

This caused Chris to stiffen and his eyes to widen. He stood there, staring at his younger sibling for a while before starting to laugh. “Oh, good one! You had me going for a second!”

She didn’t respond, her back still facing him as her wings twitched and her tail flicked in annoyance.

“Y-you’re serious?” Chris asked when he didn’t get the laugh he was expecting from her. All thoughts of the bed waiting for him upstairs left his mind completely as he stared incredulously at his little sister. “You… do know what you’re asking of me, right? You know... your big brother?”

Blue sniffed the air again, her body shivering slightly. “Of course I do. Do you really think I would be so careless?”

“But you can’t be serious... I’m your brother!”

“Adopted brother,” she snapped, an ear twitching. “We aren’t related by anything more than paperwork, so is it really that big of a deal that I would ask you for help with this?”

Chris’s brow furrowed at her words. He knew she didn’t mean it in a negative way, especially when she was this emotional thanks to it being her first estrus, but it still stung slightly. “That might be true, but... I mean... we grew up togeth—”

“Look, I need your help!” Blue Moon snapped, finally turning to glare at him over her shoulder. Her eye narrowed, the pupil nothing more than a sliver of black against the iris. “This is one of the few chances I get to play at home when the others aren’t around. You know how they are when I try to practice at home, and I would like to take advantage of this peace and quiet and finish practicing before they return. But I can’t do that with this accursed heat! That’s why I need your help to take care of this—” she flicked her tail aside just in time for him to catch a small drop of moisture dripping down onto the floor from between her legs “—so that I can concentrate properly. Now, are you going to be a good big brother and help, or am I just going to have to suffer through this?”

“Okay, now hold on a second,” Chris said quickly, throwing his hands up in a defensive manner. Memories of him and his youngest sister playing a game of tag in the woods flooded his mind, reminding him of a more innocent and simpler time. He couldn’t go through with this, could he? They might not be blood-related, but she was still family to him and one of his best friends. This was not how he pictured the day ending. “I just feel like you’re not thinking this through, Moonie. I mean, we used to—”

“What are you? A gelding?” Blue growled, interrupting him with a challenging scowl.

Chris closed his mouth with a ‘click’ and glared at his younger sister. Something about the way she said that sparked something deep within him, something that he might have been trying to repress for a while. It wasn’t like he hadn’t thought about Blue Moon in that way before. Being stuck in a house with seven other occupants of the opposite sex made things rather difficult for him, especially when they were all admittedly attractive in their own way. Not only that, but with such a full house, it was hard for him to find the time to… relieve some stress. It was even more frustrating given that the thin walls of their home let him hear just how vocal all his siblings could be when they were relieving their own stress during estrus. In a lot of ways, he was experiencing his own type of heat, having a lot of pent up frustration that had accumulated over the years.

Am I seriously considering this? Chris thought to himself, gazing at his irritated but attractive sister as her tail continued to swish from side to side, teasing him with what lay beneath. He had to put himself in her hooves, and given the situation, it was a somewhat logical and effective solution to her problem. Plus, she was right. They were technically not related even though he had just grown up beside her and watched her develop into a young and beautiful filly. He was even there for her when she finally got her cutie mark.

…

Oh sweet Luna...

Chris felt as though his heart was being split in two, but he couldn’t just let his sister suffer, especially after she asked him for help that only he could provide. She probably trusted him more than anypony and that’s why she felt she could ask him in the first place.

He had to do it. He had to help his sister.

Chewing on the inside of his cheek, Chris gave one last glance at the door before sighing and shaking his head.

“Okay, okay… fine…” he said, stepping away from the door. He closed it before turning the lock, the action helping to put his mind at ease even though the house was empty. His heart raced with each step he took towards his sibling.

“Thank you,” Blue said softly with a small sigh of relief, a smile touching her lips.

“J-just... just don’t tell Mom about this,” Chris begged softly as he came to a stop behind her.

This caused her to blink. “Why? We aren’t technically doing anything wrong. I have my cutie mark, so I’m of legal age.”

“Yeah, but...” Chris tried to protest, chewing on the inside of his cheek for a moment. “It’s just… weird, okay?” he huffed. “I don’t think Mom will... understand...”

She was silent for a moment before shrugging. “Very well. If you insist, I will not tell Mother of how you assisted me.”

“T-thanks,” Chris said awkwardly before sighing. He rubbed the bridge of his nose with his thumb and index finger. “Okay, let’s just… get this over with.”

“Yes, let’s,” she agreed with a nod, then waited.

Chris stood next to her, his blush deepening as an awkward silence filled the room. It was so quiet he could actually hear his heart trying to pound its way out of his chest.

“Well?” Blue asked after a few seconds more of waiting impatiently, some irritation creeping back into her voice. “What are you waiting for!?”

“I just...” Chris started to explain, tapping the tips of his index fingers together as his stomach twisted into a nervous knot. “I’m not exactly sure what to... W-well, what do you want me to do, exactly?”

Blue turned her head to look back at Chris, giving him an incredulous stare, as if he was supposed to know. “What do you mean? You’re the big brother here! Didn’t you use to have a marefriend? And don’t you watch porn, like... all the time?”

Chris’s blush deepened at her words and his mouth grew extremely dry. He couldn’t believe he was having this conversation with his sister.

“N-no, not exactly,” he replied weakly, reliving some of his more awkward memories of his past when he tried to court another mare his age. “We weren't really a, uhh, steady couple...” He didn’t want to answer her second question, not wanting to admit his porn viewing habits to his sibling. Although that suggestion did spark some ideas, and he figured he could take some inspiration from a few of his favorite scenes.

“Alright, here... let me just...” With that, he slipped his arm around her, then pressed her back against his chest. The sudden embrace caused Blue to squeak and her wings to flap in surprise, the leathery appendages brushing against Chris’s sides. He could feel her whole body trembling, demonstrating just how much she really needed this.

“Uhh, what are you doing?” she asked curiously, peering up at him over her shoulder.

“Helping you out,” he muttered nervously, not knowing what else to say. “Just, um... hold still.” He hesitated briefly before placing his hand on her surprisingly fluffy chest. Blue looked down to where he was touching her before he slowly started to trail his hand down her stomach, running his fingers through her silky coat.

“H-hey, hang on a second, idiot!” Blue shouted, her face contorting as she tried to hold back a giggle from his ticklish touch. “At… at least let me put my cello down first!”

“Oh, right. Here, let me do it,” Chris said with a slight waver in his voice. Keeping his arm around her, he took the cello from her trembling hooves and placed it gently in its stand off to the side. With that done, he returned to what he was doing before and started to caress her stomach with his hand.

Blue shivered in his arms as his fingers slowly wandered along her underside. She instinctively spread her forelegs out for him, giving him more room to explore as she idly watched him rubbing her belly.

“You know, this feels really nice and all, but it's not exactly helping,” Blue pointed out flatly after a while of him doing the same thing. She squirmed slightly as her heat symptoms started to intensify.

Chris bit his lip, knowing that he was just delaying the inevitable. “J-just hold on, I’m not done yet!” Swallowing the lump in his throat, he closed his eyes and got himself ready to get this over and done with. With that, he let his hand fall towards her almost fully developed teats, letting his fingers lightly brush over her erect nipples, drawing out a suppressed stutter from her.

“W-whoa,” Blue whispered softly. “That felt...”

Chris didn’t wait for her to finish that sentence and quickly took one of her delicate nipples between his fingertips, giving it a firm twist.

“G-gaaah!” Blue cried out at the strange and new sensation. Her hind legs quivered beneath her, threatening to send her crashing to the floor if Chris hadn't been holding onto her so tightly.

“C-Chris!” she called out as he continued to play with her sensitive teats. He could feel her body melt into a trembling mess in his arms, encouraging him to keep going.

Feeling only slightly braver, Chris hunched down lower, letting his chin rest between his sister's ears. He was getting ready to move into the next phase he had often seen in his favorite video erotica.

Blue gasped as his hand started to trail even further south, drawing closer to her burning loins where she instinctively wanted his touch the most. Pressing her back against his body, she groaned hotly as her arousal began to drip down her inner thighs. The heavy scent of a filly in heat quickly filled the room.

Almost reflexively, Blue’s left foreleg reached up and wrapped around the back of Chris’s shoulder for added support, being the only place she could really reach. Her hind legs continued to buckle under her own weight, growing too weak to support her any longer. Without even knowing it, her body started to act on its own, grinding her supple flank against the fabric hiding his hardening length as she whimpered helplessly in his grasp.

Chris bit his lip, trying his best to keep calm and in control of the escalating situation. Even though it was a little hard for him to reach, his fingers brushed against the soft and smooth furred skin of her pubic mound, causing her to shiver. He could feel the intense heat emanating from his sister’s body as she desperately tried to grind her hips against his fingers, but could do little as he held her in place.

Blue stood up on the tips of her hooves, trying desperately to get Chris to move even farther down as her head leaned back. Her soft and curly mane pressed into his nose, tickling him as a few silvery strands brushed against his cheeks. She was close enough now that he could smell the spearmint-scented shampoo she liked to use, which excited him even more. He briefly remembered helping her pick out that exact same scent when she started taking her own baths.

It suddenly struck him like a bolt of lightning that it was his sweet and innocent little sister he was currently molesting as she moaned and whimpered in his arms. The thought nearly caused him to stop, but the little mewling moans she was making were causing a stirring inside him. Despite the awkwardness of the situation, he could feel himself growing more and more aroused. He tried to move back so he could make some distance between them, but she followed, keeping her flank against him as much as possible.

“Could you, um... ease up a little?” Chris asked, wanting to make this situation less awkward.

“W-what? No!” Blue grunted, pressing her butt even harder into his erection. “Not until you help me!”

“But, I um…”

“Don’t worry about your little problem! I-I don’t mind,” she breathed, grinding against his trapped member. “I like it, okay? Now just keep going!”

Swallowing thickly at her words, Chris tried to take a calming breath in hopes that it would help his little friend go down. With no success, he continued onward, reaching even farther down until his arm was completely stretched out, his fingertips brushing over her heated entrance.

The effect was immediate. Finally getting some attention to the place she needed it the most, Blue let out a loud cry of pleasure, making him thank his lucky stars the rest of the family was not home.

“B-brother!” Blue cried again before a wave of pleasure shot through her body, causing her to flinch and arch her back against him. Unable to hold onto the cello bow she was still holding on to, it began to slip from her grasp.

Seeing the bow slowly drift from his sister’s hoof, Chris caught it before it could fall to the floor. Eyeing the long, thin piece of finely polished wood, an idea came to him that could help with their size difference problem. Feeling creative and experimental, he guided the smooth side of the bow down to her heated marehood and pressed it against her soft pubic mound.

With wide and worried eyes, Blue jerked her sight down to where her bow was now touching the very top of her marehood. “H-hey, what do you think you’re doing? Be careful with that!”

Chris ignored her and tilted the bow at more of an angle before moving it down some more, letting the smooth, polished wood run over her winking clit.

Squeaking in surprise at the new sensation, a sharp shiver ran down Blue’s spine while her body tensed in her brother’s arms. She whimpered helplessly as her mouth opened and closed, as if she was trying desperately to protest what her expensive and high-quality bow was being used for, but no coherent words could be formed.

Chris continued to work the bow up and down, deliberately slowing his movements as he lightly pressed the smooth wood against her clit, driving her insane with his teasing.

“P-please,” she whimpered. Having given up all concerns about ruining her bow, she pushed her hips outwards in an attempt to find even more relief.

“Please… what?” Chris asked as his confidence grew, breathing softly in her ear. “What do you want, Moonie?”

“D-don’t... don’t make me beg,” she breathed between her soft panting, still trying to grind her heated marehood against the thin wood.

Smiling slightly and enjoying the power, Chris stopped all his movements, lifting the bow just a few centimeters away from her aching sex. “Please... what?”

Blue whimpered helplessly, biting her lower lip with her fangs, almost hard enough to draw blood. She clenched her eyes shut and scrunched up her muzzle in a desperate attempt to maintain her dignity, but failed.

“Please play me like a bucking cello!” Blue shouted at the top of her lungs, only to cry out a moment later when he slid the bow back between her legs. Her hips began to flex and buck as the smooth wood brushed between her soft folds. It parted her lips, the entire length of the bow dragging hard across her winking clit in the process. The feeling sent shockwaves up her spine, her body twitching and spasming as she gasped for breath.

“Oh, s-sweet Luna,” she panted.

As his sister squirmed about in this arms, Chris continued to rub the bow back and forth against her wet folds in long, fluid motions. He felt it easier and easier to move as her natural lubricant continued to flow and cover the polished wood, which in turn let him move even faster and harder. He might not have known how to play an actual cello properly, but years of watching his sister had given him some idea of how to handle the bow. Sure enough, Blue Moon practically melted against him as he continued, her head falling against his chest and her eyes remaining tightly shut.

Her convulsions grew in intensity as she drew closer to the end. However, there was a problem: the sensation of the bow against her clit—while pleasurable in ways she couldn’t have imagined before now—was not enough to push her over the edge. Even as she ground herself against the bow, the sweet release eluded her. The teasing was driving her insane, leaving her teetering back and forth over the abyss.

Opening her mouth, she was just about to plead for her brother to do more and let her find the release she so desperately needed when his teeth suddenly found their way to the sensitive tip of her tufted ear. She froze immediately, and before she could even begin to protest, in one deft movement, he bit into her tender flesh. His sharp canines gently snagging her ear before closing his lips around it and then suckling gently.

“W-wait, don’t do thaaaAAAA—EEEEEEEEEEEEEEE!” Blue’s body locked up as she finally reached her peak, a wave of pleasure washing over her. Throwing her head back, a high-pitched screech emanated from her lips as her body convulsed and trembled in his grasp. Her hips clamped down on the bow, holding it firmly in place as she soaked it and her thighs in a tide of her own natural juices.

Chris held onto her tightly as she rode out her climax. Even after her high-pitched screech—which left his ears ringing—died down into a low moan and her body collapsed into a quivering pile, he supported her and kept her close to his body.

Holding her up, he tried hard not to look at the cute faces his little sister made as she reveled in her afterglow. Painfully aware of his own arousal currently straining at his pants, he planned on taking advantage of the empty house as well. Once he was done here, he’d run upstairs and take a quick shower while also tending to his own needs.

Eventually, Blue began to relax again, her body becoming completely limp. Her thighs’ grip on the bow loosened and he was able to carefully pull it from between her legs. A thin line of her arousal linked her to the bow for a short moment before thinning out and breaking apart. The highly polished piece of wood was completely soaked and dripping with her juices, the liquid glinting in the lamplight. Placing it carefully off to the side, he turned back to check on Blue, only to suddenly be pushed backwards. With a yelp, he was pushed all the way back to the wall until he fell back onto the couch that had been moved off to the side earlier.

Before he had a chance to recover, Blue was between his legs, pawing desperately like a wild animal at the clasp to his pants.

“Hey! What are you doing!?” he shouted in surprise as she continued to fiddle with his pants.

“That didn’t help at all!” she practically shouted with anger, her body still trembling from her earlier climax. “Stupid Dawn lied to me! How do you even get these damned things open!?”

“Whoa, hold on! What are you even trying to do!?” Chris cried, moving to stop her by grabbing at her hooves.

Blue growled, flashing her full set of fangs at him before batting his hands away with a hoof. “You said you’d help me!”

“And I did help you!”

“That didn’t help at all! If anything, you just made everything worse! My body feels like it's on fire, I can’t think about anything except you, and it feels like there’s a big empty hole inside me that needs something inside it!” Blue growled. “Now hold still, dummy, while I get these stupid things open.” Bending down, she began to gnaw on the strap with her dull fangs.

This is so wrong, Chris thought as the situation quickly escalated into dangerous territory, even as he sat there and watched his sister ripping apart the buckle of his pants. A part of him felt like he should stop this now before it reached the point of no return. However, another part—a part far more persuasive at the moment—told him to let her do as she pleased and see how far she was willing to go: a deeper and darker part of him that actually wanted this to continue.

Soon enough, she finally managed to gnaw through his belt. Ripping it off with her teeth, and threw it away into the room. Without wasting another second, she quickly gripped the hem of his pants the best she could with her hooves and pulled them apart, sending the buttons keeping it together flying as well.

“Whoa, Moonie!” Chris said in shock, taken aback by his sister’s determination. He didn’t have time to do much else as she had his pants undone and was now tugging them down with all her might. She only stopped and gasped once his member suddenly burst free, slapping lewdly against his lower abdomen before standing straight up before her.

“That’s… that’s a…” she breathed, staring wide-eyed at the twitching appendage, watching as a small pearl of his pre leaked out from his tip. Tentatively, she leaned forward, her hot breath washing over the exposed flesh as she studied it. “I’ve... I’ve never seen one in real life before.” After a moment of hesitation, she pressed her nose against his groin.

“Ehh, what… what are you doing?” Chris asked, raising a curious eyebrow at his sister while trying to suppress his blush and racing heart.

Blue said nothing as she kept her nose pressed against the underside of his exposed manhood, letting it twitch against her muzzle. Timidly, she took in a quick breath through her nostrils, taking in his masculine scent directly from the source for the first time.

His blush deepened at her sister's actions. He wanted to say something else, but the sound of her taking an even bigger whiff gave him pause. He shuddered as she released her breath, feeling the warm air tickling his sensitive member.

“Your scent. It… it just smells… so…” Blue trailed off. Humming softly, she closed her eyes and took in another whiff. “I can’t place it... It’s just so...”

“So... what?” Chris asked somewhat worriedly, not sure what to make of her ramblings.

Just then, Blue dropped her head down, burying her snout into the small space between his balls and twitching shaft then took in another deep breath through her nose. She held it in, humming as her eyelids fluttered and her tail whipped back and forth eagerly.

Chris’s embarrassment skyrocketed as he watched his sister take in his natural musk, which he was sure would be overbearing since he hadn’t had a chance to shower yet. It wasn’t like he wasn’t enjoying what she was doing, as strange as it was, it was just a little... odd.

He was about to voice his bemusement about her actions when he instead let out a surprised gasp as his sister lightly licked the base of his shaft.

“H-hey!” he tried to protest, but could only watch in amazement as his sister sat in between his knees, getting herself comfortable as she continued to lightly lap at his sensitive flesh. Her licks traveled lower to his testicles, her tongue slowing its movement as she dragged it over his sack. She then paused and let her tongue slip back into her muzzle and hummed.

“Its taste is good, too...” she whispered softly.

“Good?” Chris questioned, but gasped in surprise once again as Blue pressed her lips to one of his orbs, then started suckling at his flesh, slathering it in her drool. She let her tongue roll around the tender orb trapped between her lips before sucking harder, taking his ball into the warm confines of her mouth. He could do nothing but throw his head back and moan, having never experienced a feeling like that before.

“S-sis...” he groaned just as she released him, only to take the other, neglected orb into her mouth. She continued to nurse on his testicles, swirling her tongue around them so she could get the full flavor.

The sensation caused Chris’s legs to tremble.

Once Blue had her fill, she let his now glistening testicles slide from her maw and instead shifted her focus to his tall, twitching length.

All of Chris’s previous reluctance was now gone as Blue once again started to lap gently at his member, all while staring innocently up at him. Slowly, she worked her way up his shaft, her tiny fangs scraping against his length, just enough to send little jolts of ticklish pleasure through his body. The dull teeth did no harm, but the feeling caused him to involuntarily buck his hips. Precum began to bead up at his tip again.

Upon noticing it, Blue eyed the glistening liquid for a moment before leaning up and popping the head into her mouth. Chris’s legs jerked as she began to suckle on him gently.

“S-sis... Have you... have you done this before?” he asked weakly through gritted teeth, flexing the muscles in his legs to keep them from trembling.

“Nuh-uh,” Blue hummed, sending tiny tremors through the cock in her mouth as she took in more of his length. She made it about halfway down before pulling off of him. “I’ve never done this before… but Moondrop has me pre-read some of her more, umm… I forget what she called them... not comics. Let’s just say, detailed fanfictions.”

A small smile crossed Chris’s lips. He understood exactly what Blue was suggesting about their sibling, but he was broken from his thoughts as she brushed the tip of her muzzle against his cock. She continued to kiss and lick up and down his heated flesh, seeming to do it for her own enjoyment more than his. She lingered on his balls for a few more seconds before slipping his member back into her mouth.

Keeping eye contact with her brother, she began to bob her head up and down, sucking softly as she went. It wasn’t perfect, but what Blue lacked in experience she made up for in enthusiasm. Before long, Chris was writhing about as he quickly neared his climax.

“M-moonie… I’m… I’m getting close,” he grunted, scrunching up his face.

Blue Moon’s eyes widened and she immediately pulled her mouth of his length. Ignoring Chris’s confused look, she gave him one last kiss on the tip of his dick before suddenly pulling herself up onto his lap.

Chris’s own eyes widened once he realized what she was about to do, and he put his hands on her shoulders to stop her. “Wait, Moonie, we… we can’t.”

Blue Moon looked up at him with confused, but pleading eyes, her body giving an involuntary shiver.

“Please, Chris. We can’t stop now,” she begged, taking on a much kinder and loving tone than when they first started. Panting heavily, she continued. “I… I need this.”

“Masturbating and blowjobs are one thing,” Chris argued, keeping his hands on her shoulders, “but this… this is too far! We’re siblings, for Luna’s sake!”

“Not by blood!” Blue shot back, some anger creeping back into her demeanor.

“W-well…” Chris started to say, trying desperately to think of a counter argument. “You’re... you’re just too young for this!”

“I have my cutie mark now, you know this! You were there when I first got it!” Blue growled as she stared at him, her wings flaring as wide as they could go.

Chris visibly winced at her statement, reminding him even more of who was currently asking him for sex.

“Please, Chris,” she started to say softly, going back into her more loving tone. “I know this might be awkward for you, but I need this. I promise, this won’t change anything between us. You’ll always be my big brother, and I’ll still be your little sister, but for now, please… let’s do this together.”

Chris was starting to visibly sweat. He tried to look away but he couldn’t break his gaze from her beautiful ice-blue eyes.

“But…” he continued to protest lamely. “Don’t you want to do this with somepony special? Somepony that you love dearly?”

Blue Moon smiled and with a sudden force, she pushed herself forward and quickly pressed her lips to his, catching Chris completely off guard.

His eyes widened as their lips touched, his hands slipping away from her shoulders and rested at her sides. She lingered there, letting their lips embrace each other way longer than a normal sibling kiss should have lasted.

The naughtiness of the act caused Chris’s heart to skip a beat.

Before he could even begin to process what was happening, Blue started to pull back, breaking their intimate connection. He stared at her with wide, shocked eyes as he tried to form words, but nothing came.

Blue smiled down at her dumbfounded brother, a small blush touching her cheeks.

“Chris,” she said calmly, being the one to speak up first. “You are somepony special to me, and I do love you dearly. You mean more to me than you truly know.”

Chris sat there, blinking up at his sister. He was seeing a side of her that he had never before experienced. It wasn’t a bad thing in the slightest, just... uncharacteristically loving and honest.

With a soft giggle, Blue pressed her forehead against his before continuing. “And I’d gladly experience this with you.”

Chris looked into his sister's eyes for a moment, his heart beating out of his chest, but her words seemed to help his nerves. Something about the way she said it told him it she was being genuine and, truth be told, he felt the same.

He smiled tentatively before nodding, his head rubbing against hers. “Alright.”

“Thank you,” Blue breathed. Placing her forehooves on his shoulders for added support, she pulled herself up onto his lap and aligned her burning sex with his length. Small drips of her arousal fell onto his manhood, causing him to shiver. Slowly, she lowered her hips until his tip brushed against her folds. She tried to take him into her warm embrace, but his smooth and rounded tip kept slipping between her lips, rubbing up against her pulsating clit. Looking down between her legs, she grunted in frustration as she kept trying to get him to enter her with no success.

Seeing her struggle, Chris reached down with his hand and steadied himself, aiming his member directly at her winking marehood.

Blue looked back to her brother and smiled before lowering herself again. This time his tip parted her delicate petals with ease and prodded against her now clenching love tunnel.

The sudden feeling of intense heat and dampness caused Chris to gasp.

“Bear with me,” Blue grunted in a soft whisper. Pressing down, she began to ease his head into her small, tight tunnel. Inch by inch, his cock stretched her inner walls as she worked him even deeper into her heated depths with surprising ease, thanks to how wet she was. Groans of pleasure escaped the pair as they slowly became one, Blue’s flank finally coming to rest on Chris’s hips.

Now fully hilted inside his sister, Chris marveled at the sensation of her warm folds squeezing and clenching down upon him with surprising force. Her velvety walls rippled around him, as if trying desperately to coax him into releasing his seed, which he was already very close to doing.

They stayed like that for a moment, both of them adjusting to each other as they reveled in the new sensations.

Once she felt adjusted to her brother’s shape and size, Blue slowly began to raise her hips off his cock. She didn’t wait long before letting herself drop back down again, her hips slapping wetly against his. There was a brief pause as her forelegs shook with pleasure before she rose again.

Chris bit his lip and curled his toes as she lifted off him once more. He could feel every muscle in her marehood clench down on his escaping length, as if she was trying to keep him deep within her. Almost out of instinct, he let his hands fall to her hips and gently guided her as she picked up a steady rhythm, moving up and down. He could already feel a familiar pressure being milked out of him to an unbearable degree, but he flexed his stomach and did his best to fight it. He didn’t want this moment to end just yet.

The room soon filled with the wet slapping sounds of their lovemaking as Blue continued to hump away at her brother. The smell of sex hung heavily in the air, sending both siblings’ heads spinning with lust and dizzying pleasure. Neither said anything, the pair too focused on their forbidden act to speak properly. Instead, they continued to stare into each other's eyes, their foreheads pressed firmly together. Their breaths mingled as they panted heavily.

Chris could feel Blue’s insides convulse tightly against his girth, rippling and flexing in time with each of her shaky thrusts. Soon he was matching her movements, pushing his own hips up to meet hers. Her dripping arousal flowed freely, lessening the friction between them so they could both push harder and faster into each other. The excess of her essence ran down from their union and pooled in his lap before continuing on its journey, soaking into the couch cushion, and possibly staining it forever.

Neither sibling noticed nor cared.

“B-brother...” Blue breathed, her hips moving slightly faster.

Chris could feel her internal muscles spasming around his member every time their hips slapped together, tipping him off to her incoming climax. His own was just around the corner as well, but he held fast. Instead, he started to piston his hips harder, wanting to bring his sister to her peak before he lost all control.

“Gahh!” Blue Moon cried out, reacting to his increase in speed almost immediately. Her hooves dug into his shoulders as she pleaded, “Don’t stop! Sweet Luna, don’t you dare stop!”

Gritting his teeth, Chris kept up his pace until Blue’s body suddenly tensed. She threw her head back, crying out in a high-pitched screech that filled the whole house. Her marehood squeezed down on his member almost hard enough to stop his movements completely. In the same moment, a powerful gush of fluids splashed against his lap. The added lubricant helped him to keep moving despite her walls using all their strength to keep him held in place in order to prolong her climax.

Her screech quickly died down as she fell onto his chest and wrapped her forelegs around him. She latched onto him tightly as she rode out the last of her climax, her vaginal muscles doing all they could to milk him of his seed. She bit down on the collar of his shirt, muffling her small shrieks of delight as he continued to piston his member through her now overly-sensitive folds.

The feeling of her marehood enthusiastically milking his member sent Chris over the edge as well. Hugging his sister tight, he made one final thrust before burying himself as deep as he could inside her welcoming depths. He cried out to the heavens as he finally reached his end. His cock throbbed, spurting hot seed up against her deepest barrier, coating her insides in his genetic essence.

Blue mewled helplessly as a searing wave of relief burned its way into her core, causing her whole body to quiver once before she collapsed into a limp pile of pure satisfaction. She laid there, drooling slightly on her brother's shirt as his throbbing length continued to send multiple jets of liquid relief where she needed it most. It pooled just at the tip of his member, helping her to feel the certain emptiness inside her slowly slip away, being replaced instead with a glowing warmth.

“Chris...” she panted as her belly started to feel all tingly and her mind melting into a blissful mush.

His member continued to twitch and pulse, sending the last of his seed into her body as he buried his face in her mane, inhaling her scent.

The pair remained locked together for a few moments longer, basking in their individual bliss as Chris’s length gave one final throb. The sound of their combined panting filled the room as they held each other, enjoying their afterglow.

“That was…,” Blue Moon panted, being the first to speak.

“That was... what?” Chris asked between his heavy pants after she went silent for a while.

Blue said nothing, then weakly pulled her foreleg up and let it fall right onto Chris’s lips. “Just... just give me a second...”

He laughed weakly as he ran his fingers through her sweaty mane, pampering her even as he let her compose herself. After a short while, Blue finally managed to lift herself up slightly so she could give her answer.

“That was... satisfactory.”

“Just satisfactory?” Chris asked with a bemused chuckle as he rubbed a spot on her back, just between her wings.

Blue Moon shivered at the contact, but quickly composed herself again, reverting to the filly he knew and loved so well.

“Yes,” she said calmly, doing her best to keep up her cool and collected facade, despite the fact his member was still buried inside her used marehood. “I feel better, if that’s what you're referring to.”

Seeing through her act, Chris smirked and gave a small thrust of his hips, pushing his slightly wilted member back into her still sensitive marehood.

“A-ahh!” Blue cried out with a bright blush, losing all her composure and falling back onto his chest. “Okay, okay! It was amazing! I’ve never felt so good in my life and you quelled my heat!”

“Good,” Chris said with a victorious smile as he brought his hand back to her messy mane, letting his fingers run in between her silvery curls. “It was really good for me too.”

“Yeah, well...” Blue started to say, letting her head rest on her brother's chest. “We have a new problem now.”

Chris gave her a tired, yet confused, look. “What do you mean?”

Blue shifted about again before replying. “My heat might be gone, but now...” She paused and gingerly lifted herself up, wincing as his limp member slipped free from her used sex, slapping wetly against his lower belly. The pair looked down between themselves, revealing they were still connected by several sticky, thick strands of their combined essence.

“We need a bath,” Blue said flatly, her muzzle scrunching up in disgust.

Huffing softly, Chris made sure his grip around her was secure before slowly getting to his feet.

Blue didn’t protest, wrapping her hooves around the back of his neck and letting her head rest against his cheek.

Chris’s pants fell around his ankles, and he carefully stepped out of them. Carrying his blissful sister in his arms, he made his way out of the den and turned towards their mother’s room where he knew her shower would be big enough for both of them.

“Come on, you,” he said softly. “Let’s go get cleaned up before anypony else gets home.”

Blue tightened her grip and nuzzled her cheek against his before sighing deeply. “So much for getting some practice done today,” she muttered, but he could feel her smiling.

“Yeah, yeah,” he said good-naturedly. “Quit your complaining. Now, let’s get this over with. I don’t know about you, but I could really go for a nice, long nap.” He chuckled as he walked, but just then, something came crashing into his mind. Something that he hadn’t thought about until just now.

Something that sent a small chill down his spine.

Oh sweet Luna’s suckable tits... My little sister took my virginity!

After the shock passed, he simply sighed and shrugged his shoulders. If anything, he was happy it was with her, and never gave it a second thought.

With his sister in his arms, Chris climbed the basement stairs, quietly humming the tune that had drawn him down to the basement to begin with. After a moment, Blue joined in, and the pair continued to hum along together as they ascended the steps.

Author's Notes: