Author's Notes:

Contains: incest, reluctance, teasing, estrus sex, creampie, cum in womb, sappy romantic lovemaking

By this point, there's enough pieces in place to see some things coming. Sappy is good.

Next chapter, there shall be much

Twilight Sparkle paced back and forth in her living room, feeling anxious about meeting with her brother for dinner that evening. There just hadn’t been enough time to sort herself out before the day arrived, and it was incredibly nerve-wracking to feel so out of control of her life.

Her worrying that she couldn’t think clearly on the morning they parted ways, after all the lovemaking they had done, had in fact caused her to make an obvious mistake. She should have told him a full month, or something. Anything. Not just one week.

Once Twilight’s hormones had settled back to normal, her estrus cycle had merrily come back to trouble her as well. Except now, her body had fallen victim to a natural hiccup of her own biology. Namely, teasing her estrus with very real satisfaction from Shining temporarily getting her pregnant, and then her letting it go out of necessity, had made her estrus come back with a vengeance like it was foal mad over stolen cookies. Tea had no effect on her now, and estrus suppression spells burned out a lot faster than normal. To make matters worse, because of how they worked, the estrus suppressor spells had to run their course before being recast. Unlike the thankfully fully refreshed three contraceptive spells she made sure remained intact just for her peace of mind, themselves designed to last a minimum of two weeks even without being re-energized.

She sighed, again pausing in her endless nervous pacing to stare at the floor at her forehooves. Studying had been increasingly difficult over the course of the week as the urge for sex had grown. Princess Celestia had at least been kind enough to give her a reduced lesson plan so Twilight had more time to tend to her personal needs. Even if my suppressor spell burns out even faster than the last one while Shining Armor is still here, and I get to have him one last time, feeling him shaking in the ecstasy I gave him, pulsing inside me as my womb fills with every warm drop of his… Gah! No! I can’t think like that right now! I need to keep my head clear so we can make logical, smart decisions about us accidentally falling in love and how we should deal with it!

It didn’t help, that in addition to her estrus running rampant, the suppressor spells had been behaving erratically on how long they’d last. With times running anywhere from eight hours, down to less than one hour, it was a frustrating predicament. As it was, she’d just endured over two hours of her full overactive estrus just so she could use the spell shortly before Shining’s expected arrival for dinner. Her cheeks warmed as she recalled how furiously she’d been masturbating for most of that time, unable to stop picturing her brother working her over instead of a rubber fake. Twilight knew that if he’d shown up right then, he would have been her dinner. She couldn’t help the flash of guilt the knowledge gave her, even though she knew it wasn’t even logical to be guilty for it.

Back and forth she went in her head, sometimes pacing and sometimes just staring at her hooves, until the dreaded time finally arrived with a modest knock on her front door.

Steeling herself before pulling it open, Twilight blinked in confusion and suddenly found herself at a loss for words to the sight before her eyes.

For lack of a nicer way of putting it, she thought her brother looked half dead, haggard and worn out. He had his left foreleg in a sling, and there were serious bags under his oddly vacant eyes. Even his usually well-kept mane seemed very frazzled. “Um, Shiny? Are you ok?”

Shining Armor gave her a weak, sheepish smile. “I’m fine. Just kind of tired is all.”

Privately, Shining gave a small shudder inside. Twenty. Seven. Hours. All without stopping. Even when I needed to eat, Cady was gulping down a load or two with her lips around the base… Yeesh, if it wasn’t for bathroom breaks, I probably wouldn’t have even a single moment’s rest. Unbelievably amazing as it was while she was in action, this hangover from excessive sex is gonna kill me if it happens again anytime soon, but at least she confirmed she burned off nearly all of her pent-up lust. Been a fun day, stuck waking up at the crack of dawn to get the missed day of duty. She might have given me a royal order to remain with her for the day, but it doesn’t mean the work stopped coming in. And having General Hardass laugh himself to tears when I privately admitted why Cady suddenly ordered my temporary leave was just embarrassing. It’ll be really nice to just spend some quiet time with Twily for a while as we sort our situation out. She’s far less crazy than Cadence.

“Work out too hard for PT week?” Twilight questioned, glancing at his left foreleg in the sling as he limped past her so she could close the door.

He coughed lightly, grumbling out, “Something like that, yeah. The dislocated shoulder is from a sparring accident a few days ago.” He paused, deciding to just be honest as he glanced down before looking at his sister again. “Actually… I, uh, kinda let myself get lost in working out for the week because I kept worrying about things between us. Things have changed forever, no matter what we do about it from here, Twily. I worry it’ll mess something up between us, and we will never find a way to fix things again.”

Giving him a soft smile as she stepped close and nuzzled his cheek, there was comfort in the warm familiarity of his scent. Twilight spoke in a quiet voice. “I know. We’ll talk after we eat. It’ll give us a little time to think of what we want to say, now that we’re here together.”

The two of them soon settled at the dinner table to eat without fanfare. Ordinary small talk and banter, much like they’d shared their whole life as siblings, passed back and forth as they ate their meal of ordinary penne pasta and sauce. It was one of the few things Twilight felt comfortable making, and between the food and banter, it all felt surprisingly normal. When dinner was over, both of them left the table feeling that, just maybe, not quite everything had to change as they went down new paths.

Sitting quietly together on the couch, Twilight snuggled up against Shining’s right side, his foreleg around her shoulders. Nothing was said for the first few minutes as they stared off into space, having no need to rush as they thoroughly relished being close. The simple comfort of being together in the moment further helped ease their worries, as the idea that they could find a comfortable solution gradually seemed more attainable. And having made arrangements for Spike to spend the night at the castle again like the previous weekend, they were free to talk without risk of him hearing or interrupting, once the moment was right.

“So…” They both started at the same time, glancing at each other with small chuckles.

Shining gave his sister’s soft cheek a gentle nuzzle. “You go first, Twily.”

Twilight returned the nuzzle and wiggled just a little closer to her brother, enjoying the warmth of his body next to hers, and how despite his muscle, he was so completely comfortable to rest against. A lavender hoof rubbed idly against the fur of his chest as she spoke. “I… I still haven’t really decided on what I want to do, Shiny. I tried listing the pros and cons of everything, even came up with a scoring system to help me identify the risk and reward factors of this thing between us. I, I keep feeling like I have the wrong answer because I can’t separate myself from the emotions involved. It’s hard to objectively figure out the best course of what to do.

“I love you. I somehow love you so much it hurts inside. But at the same time, I have to think of other factors, like how it would affect Spike. He’s still so young and innocent, and I can only imagine the kind of stuff he’d be exposed to from other ponies if you and I decided to pursue our love out in the open. I might have Princess Celestia’s favor in a lot of ways too, but she could probably only get involved if things got really bad first.”

Giving her a gentle squeeze, Shining sighed with a deep frown. Tucking her head under his chin, the scent of her mane was wonderfully familiar as he held her tight. “I wish I could just make this all better, Twily. I really wish I could, but I can’t this time. BBBFF powers or not. Maybe the question just comes down to how much we’re willing to suffer to be together? I know Cadence would fully support us, no matter what. Or maybe we’re thinking about it wrong and we could be together without anypony unpleasant ever knowing? I tried to think it through this week and kept getting more and more frustrated, which is part of why I look so worn out. And you’re right about needing to consider how this would affect Spike, too. I can’t believe just how much I love you, and yet still feel so trapped that I can’t just act on my love for you without serious thought. Sometimes I toy with the idea of just forgetting it happened. That maybe giving you a chance at finding a stallion that can openly love you like you deserve is best, but it kills me to think of anypony else getting to have you.”

Twilight felt herself tremble from an ache in her heart before she rolled herself around to hug him fully, chest to chest as she held him tight. She often did it when they were younger, always feeling secure against her big and strong older brother. Burying her face in his neck, she forced away the feeling of her estrus teasingly reminding her that she was now straddling his lap. Instead, she just focused on the soft warmth he radiated. The comforting feeling of his right forehoof gently rubbing her back chased away much of the heartache at least. For several quiet minutes, they didn’t move or speak, simply appreciated the mutual comfort the other was giving.

Eventually, Twilight lifted her head after placing a soft kiss on his neck before meeting his eyes. “Shiny, I think we need more time to think. There are a lot of factors that are going to take a lot of time to process. Especially since I’m still in estrus, and not really able to keep my head consistently clear right now.”

Shining stared at his sister, momentarily frozen when her nose stopped an inch from his and he swore he saw desire flit briefly across her face. A mirrored desire of his own flashed through him, knowing he couldn’t hide at first either. “Not much I can say there. Whatever you need though, just ask and I’ll do it. How much time do you want?”

The longer she stared into his eyes, the closer Twilight felt herself getting, the feel of his breath playing across her lips wasn’t doing anything to dissuade her, even as she kept reminding herself it shouldn’t happen, that they needed to have clear heads before anything happened between them again. “I, I don’t know yet. Maybe I just need some distance until I have a handle on it and I could tell you. I… W-we…”

Twilight’s resistance broke just then, and she knew what she was going to do, even as she continued to question and doubt herself. I really can’t tell if I’m doing this because my estrus suppressor spell might be wearing out early or not, but do I even care when I love him this much?

Shining’s eyes widened as hers fell shut, Twilight’s lips pressed against his as she held him tighter. Despite knowing they weren’t in the clearest of minds, he couldn’t deny her a kiss, pressing back as their lips moved together with slow burning passion.

It wasn’t until Shining felt her starting to rock her hips against him that he snapped out of the daze, realizing she’d put herself in a risky position. Her faint rocking motions were pressing her marehood right against his sheath, causing him to push her back as he kept himself in check, both of them breathing a little faster than before. “Twily, what are you doing?”

Twilight bit her bottom lip for a moment, still making faint rocking motions as she kept her eye on him. She felt herself tingle from anticipation when she felt his sheath shift and swell slightly beneath her. “Shiny, I… I need to know what it’s like when we’re not lost in the moment and just going with it. I love you so much, and I need to know what it’s like to be with you just because we wanted to make love. No shock, no panic. No haze of lust keeping us almost trapped. Just feeling each other intimately again after we’ve been together before.”

Swallowing despite his dry mouth, Shining held onto his composure, even as her rocking motions gradually got more insistent and he had to restrain himself more. He could feel the heat of her pressing against his sheath, and the dampness she was rubbing against him. “Twilight, I want to as well, but neither of us is thinking straight right now. Maybe we should hold off until we have this figured out.”

She could feel herself getting wetter as she pressed herself against him more firmly, a small shiver running down her spine from knowing his gradually swelling sheath was starting to be smeared with her own arousal. She held his gaze as she rocked against him, biting her bottom lip again as she didn’t even bother trying to hide her need from reaching her eyes anymore.

Shining knew he wasn’t really resisting very much, feeling a particular liquid warmth spreading around the opening of his sheath and making restraining his cock more difficult. Her aroused scent was a heady, enticing thing as it filled the air. The look in her eyes and the way she bit her lip as she sat on his lap was doing nothing to help him resist. “We, we really shouldn’t…”

Twilight’s horn lit up as her brother watched her, not knowing she quickly cast the spells to open her cervix for his seed at orgasm, and to keep it all locked deep inside, unsure if her estrus suppression spell had faded or if she just needed him that badly. She knew what she wanted now, what she needed, and how much he’d put inside her. She saw his eyes widen at the part of her magic he would be able to notice, when she used her magic to spread open her marehood right against his sheath, the tip of his cock now peeking at the edge as her entrance was spread open against it. She only gave him a heated stare as she continued to grind against him.

He tried to say something, to deny how much he wanted her, maybe even claim how utterly exhausted he was from his time with Cadence, yet nothing came to his lips. Twilight’s softly panting breaths were like desperate pleas that called out to him. He knew he was going to lose this fight if he couldn’t express why they should hold off, but was losing all desire to do so as he kept getting more aroused, gradually overcoming his reluctance with each beat of his pulse making him swell up just a fraction more. The way her spread marehood slipped against the leading edge of his tip told him she was soaking wet. For me, or from her estrus? Does that even matter when I’m was the only one she wants to begin with?

Leaning just a little closer, the fur of their lips brushing against each other with feather-light touches, Twilight felt her brother’s arousal finally reach high enough that the head of his cock stuck out sufficiently for her to make her move. As she pressed herself down again, still holding herself wide open, a circle of her hips spread more of her own copious arousal around the head of his shaft. The lips of her open core glided against him with a tingling smoothness, before she centered herself and let herself rest directly over his sheath again. The edge of his flare rubbed between her spread vaginal lips slightly before she released them, feeling herself close behind his warm flare and trapping his tip fully inside. A shudder ran up her body as she let her marehood tug encouragingly at his slowly growing length, knowing she’d get to feel him harden inside her body until he touched her cervix again.

Her voice was a sultry, desperate whisper. “You’re inside me again, Shiny. Stop holding back and let me feel your love again. Make love with me. I need you big brother. Please…”

Shining gasped when he felt her close around the head of his cock and her inner passage began to tug gently at him to go deeper as they both went still. Giving in to his own need, his unrestrained arousal was a like a sudden surge as he smoothly spread her open. As his shaft speared slowly upwards through her core, he heard her let out a long shuddery gasp, then a soft whimper when he finally touched her cervix again. When her lips found his, he had no resistance left. His tongue met hers readily as her body quivered around him.

Twilight felt a happy tear escape and roll down her cheek as she kissed him, starting to rock herself gently on his buried length again. In some ways, this time felt even better than before. She still had her worries, but for the moment she could put them away. Her world felt complete and right with her BBBFF physically joined with her in the oldest dance. While tempted to move more urgently, to let his whole shaft slide in and out of her body until she came to the feeling of him spraying his own climax inside her, the moment of gentle, tender passion felt too good for her to interrupt.

The pair worked their bodies against each other in small motions, feeling a certain desperation that demanded he remain deep inside her and not pull away very far. It was similar to the first couple of hours where they’d been stuck together after they learned each other’s real identity. Yet, even without being stuck, the feeling of being so joined kept resonating through them. They were making love together with each passionate gasp or slippery grind that let his tip press straight against her cervix. It was unhurried, loving passion.

At some point along the way, Twilight finally felt his flare starting to spread her open deep within. Time meant nothing to her, and knowing she was going to bring her brother to release made her feel somehow even warmer. Breaking their deep kiss to nibble at one of his ears again, she panted her faint, whispered words right into his ear. “Inside, big brother. Every drop will go right in my womb again. Aaah~... Please, give me your love where I need it most.”

Shining never stopped his steady rocking motions, only an inch of his length slipping out before pushing fully back inside her, his right foreleg pulling her down with each push. He could feel the tingles of a powerful climax building, ignoring the urge to go faster and just letting it rise at it’s own pace. He whispered back to her, a desperate need in his voice. “Y-you’re still in estrus. Twily, if I do that…”

Twilight struggled to keep her breathing under control as she panted, feeling her own orgasm nearing and meeting every push inside her, pressing him as deep as she could. It was moments later that she felt her cervix getting pulled and spread open as his flare grew close to it’s widest. “A-and if I-I said I want you to get me p-pregnant again? That maybe m-my uterus is unprotected because I want you to gift me with a foal b-because I love you s-so much?”

Pulling away just enough so he could press his nose to hers, Shining met her eyes. For a moment, nothing scared him, and he only gave her a loving smile. Pulling her more firmly onto his shaft as their impending peak grew, he gave her a hoarse whisper. “I’d say to look into my eyes as I put all the love I have inside you…”

She tried to make a sound as she saw the lack of hesitation in his eyes, but her voice was snatched away as their mutual orgasm finally took hold. As she struggled to even breathe, pulses of intimate warmth began to flow deep within her trembling body, passing through her inner gate to rest in her most sacred of spaces. Their eyes remaining locked on each other as they watched and shared each other’s pleasure breaking over them like a long-lasting wave of electric ecstasy.

Neither was entirely sure when their shared climax ended, as they didn’t move a muscle, just remaining still as they stared into each other’s eyes. Whether seconds or minutes had passed by then, neither could tell.

All they knew right then came bubbling out of them at the same time, tears welling in their eyes from their total conviction and absolute certainty.

“This love is for life.”

They needed no more discussion than that. They were going to love each other as lovers for the rest of their lives. And they would never have to worry that it would somehow change, no matter what happened down the road.

Eventually, Twilight curled in against him and held him tight, feeling him hold her close in return. She could easily have fallen asleep right where she was, his shaft staying fully inside her, and the feel of liquid warmth now securely held inside her womb. She felt completely comfortable right where she was, but didn’t want him to feel uncomfortable by staying in his upright position too long. She knew he’d let her sleep all night right here if she ask, but letting him be uncomfortable was not going to happen.

Once she felt it was time, Twilight sat back up and gave him a warm, loving smile. “Shiny, do you think you can stay the night?”

He returned her smile with relaxed ease, though there was a faint note of resigned acceptance. “Thankfully, tomorrow is a partial day off for me after PT week, so yes, I can. I do have to get back around noon, but that leaves me all yours for the whole morning. So, we’re, uh, probably going to have a foal, huh?”

For a moment, Twilight was confused. And then her mind registered what she’d done.

Twilight’s face exploded with a brilliant blush and she initially only managed a horribly embarrassed squeak, forehooves covering her face. It took her a minute to find her voice, feeling more than a little ashamed as she slowly lowered her hooves, ears folded back against her head as she looked down. “Shiny, I… I don’t know what came over me in that moment. Please don’t be mad, but I still have the same contraceptive spells in place on my womb from before. W-we, well, I could drop the spells if you really want me to. I could even apply a fertility spell if we want to be even more sure… Um, I--mmf…!”

Shining’s hoof touching her lips made her go silent, though relieved at seeing he was still smiling. “Ok, no. No need to go down that road, sis. Honestly, while I was completely ready to, if that wasn’t obvious enough from my filling you up without a single regret in doing so, I’m kinda relieved it was really just a question and it’s not actually going to happen. And before you even respond, I will say this…”

He took his hoof away from her lips before capturing them with his own for several seconds, then pulled away to meet her eyes again. “That only means ‘not yet’ for us. We’re not really ready to have a foal right now, but I think I’d really like to someday. When we’re ready.”

Twilight stared at him in surprise for several seconds, then the emotional dam simply burst. She crashed against his chest and half laughed, half cried into his coat as she held him tight. Her happy tears soaked into his fur as she let the feel of just how much he accepted them being together wash over her with a deluge of joy.

A wide smile beamed back at him when she finally lifted her head, wiping her eyes with a fetlock. “I’m so happy to hear that, Shiny. I know it will probably be a long time from now, but no matter what happens between us and whatever we decide to do with our relationship, I would love give you a foal when the time is right. I want that someday. I want that so much.” But I still don’t have any idea what to do long term. Maybe I can ask Cadence for advice. I know you have a thing for her, and I hope you get her so somepony worthy can love you openly, but I also hope she wouldn’t mind you and I being together, at least in some way. Not like my crush on her is ever going to lead anywhere. She’s just never been interested in mares.

Shining simply smiled back, briefly glancing at a clock. “Well, while we still might not know what we should do about us yet, do you feel ready to go to bed now? In one way or another? It’s already after ten.” And I’ll have to tell you about things with Cadence soon. She did give me explicit permission to be with you, but maybe I’ll hold onto that until we figure things out between us. Heh, never thought my special forces endurance training would be useful for sex, but I can keep going a while longer if you want me to, Twily. So long as you’re happy.

Twilight gave him a nod as she slowly lifted herself off of his half-hard length, a delighted shiver of satisfaction passing through her as he slipped free. “I think that sounds like a good idea. I’m honestly not sure if I want to make love again or not just yet. You managed to satisfy my estrus surprisingly well with that one orgasm. If nothing else, I’ll get to snuggle against you under the covers and sleep very, very well.”

She saw him smile mischievously for a second, then could only give a playful yelp in surprise before she started giggling when he lifted her in his magic and set her on his back. Twilight wrapped her forelegs around his neck as he carried her off to her bed with a casual air that made her eyes mist, even if he was limping on three legs and could be mistaken for being nearly dead on his hooves at first glance.

The two of them felt confident that no matter what might come up as they figured it all out, no matter how hard it might get if they became open about it, at least they knew for certain they would hold tight to their love. Whatever else, they would always be able to share that now.