The next morning found Twilight still in bed, and it wasn’t until the early afternoon that she awoke. As her eyes opened and the sunlight ushered her into consciousness, Twilight noticed the stickiness of her bed-sheets. She’d gotten to bed later than she’d intended, upon remembrance.

                    Today, there was work to be done. Tossing her blankets to the side with a flash of violet from her horn, Twilight raised herself from the bed and carefully lowered her hooves into the detritus of research materials.

                    Something had gone wrong with the spell, whether in its initial construction or the repeat casting. It’s possible the original design was intended to deliver continuous impulse direction through a longer duration – Twilight wasn’t sure, not being the constructer of the original incantation. Either way, it was effective, but stronger than she wanted. A healthy appetite or interest in romance while not being completely sex-obsessed was the perfect compromise, and Twilight hoped dearly that she could find some way to engineer the result properly. So, there was studying to be done.

                    Deciding to forgo breakfast, Twilight made her way to the stack of study journals and notes she’d made several nights previous. She leafed through them absent-mindedly for several minutes, letting her eyes wander over the pages in the hopes that an immediate solution might jump out at her. She didn’t expect any such thing, but it would be nice to save herself the day’s work. Several pages into a likely looking dissertation, Twilight caught herself reading over the sentence three times in a row. Something was keeping her from focusing. She sighed and shifted her hind legs, then gasped as she immediately realized the source of her distraction. She was still soaking wet.

                    But, I… three times before I went to bed… For someone with no interest in sex, Twilight had set her first personal record for masturbation before she finally fell asleep, sweaty but content. So why was she still…

                    Her hoof moving on its own again drew a sharp gasp as she began to fondle her clit again, not wasting any time. No matter how many times she touched it, each one felt as amazing as the last. She shut her eyes, grinding her hoof down hard as her hips gyrated. “Oh, fuck,” she whispered to herself. The profanity felt good. She never would have imagined swearing with any regularity two days ago, but now the word felt natural. She thought it to herself again. Fuck. It was a word with implications.

                    Fuck. Fuck. I’d love to get some colt to fuck me, Twilight thought, surprising herself with her own vulgarity. But the thoughts made her body feel hotter, and the touch of her hoof so much better, so she continued. “If there was somepony here right now, a great big stallion, I’d lay him down and take his… c-cock into my mouth,” Twilight’s hips jutted forward as the word escaped her lips, and she gasped before continuing. “and I’d like it up and down, and let him… let him f-f-fuck my f-face…” Twilight’s legs were moving wildly now, her hoof a lilac blur at the top of her pussy, which was leaking a steady stream of her juice onto the papers underneath her. It felt even better when she said it. Dirtier, more real. And she meant every word of it, oh Celestia did she mean it, she’d been thinking about it all night, slobbering all over Lucky’s penis, anyone’s penis, getting it all wet and hard before she lowered herself onto it, letting it slide inside her dripping wetness-

                    Twilight’s orgasm surprised her, and she let out a high-pitched moan as her body shivered, spraying a violent splash of girlcum onto the papers and bedroom floor. She panted heavily for several breaths while leaning on her desk, trying to collect herself. Her body was tingling, as though somepony had pricked every inch of her skin with tiny electric needles. Why did it feel so good, why couldn’t she stop thinking about what she wanted to do with somepony, anypony with a hard cock to pound inside her-

                    “No! Twilight, focus, come on. You need to do this, or…” her sentence trailed off as the possibility of some unforeseen consequence drifted through her thoughts. She needed to do this, or… she’d spend the rest of her life obsessing over the thought of some stallion’s cock? That wasn’t what she wanted, no matter how good the thought made her feel. With a staunch effort of determination, Twilight cemented her eyes on the page in front of her, levitating her pen from its well and beginning another entry of scribbled notes. She stood like that the next ten minutes, reading and writing frantically, before, on its trip back from the inkwell, her pen floated somewhere other than the page of notes in front of her. The words on the page in front of her disappeared as her eyes closed and the feather floated below her body, hovering back and forth just between her legs.

                    “Oh…” she moaned, planting her forehead on the desk and rocking her hips back and forwards.

                    She was sure she could do this, finish whatever research she needed to – it just might require longer than she had anticipated.

                    Spike had committed the majority of his afternoon running errands, and he was surprised to find the hands on the clock at eight and fifteen as he closed the door to the library behind him. As he lowered his package of groceries and other assorted items collected during the day onto the kitchen table, he called out up the stairs.

                    “Twilight, are you home?” He hadn’t seen the unicorn all day, and given the events of yesterday, he was more than a little worried about her. The groceries could wait a moment to be put away while he checked up on his closest friend.

                    As Spike made his way up the stairs, he yelled towards the bedroom again. “Twilight, are you in there? I haven’t seen you all day. I just wanted to check to make sure you’re okay-“ Spike’s coughed before finishing his sentence. He was half-way up the stairs when the smell hit him, almost strong enough to make his eyes water. It was a scent he couldn’t place, a mix of sweat, and… something else. Where had he smelled that before? Whatever it was, it was very, very strong. Curious, he sniffed for a moment. The smell still didn’t reveal itself, and his mind reeled to describe it. Strong, salty, like unwashed clothes, but a little more… Like somepony had just run a marathon and forgotten to shower for days afterwards, but with something else, like…

                    Spike noticed something pulling him out of his train of thought, something he hadn’t expected to bother him out of nowhere. Even though no one else was around, he began to blush, and instinctively lowered his claws to his waist, trying to shield his awakening erection from sight. Though, as he turned his head in the narrow staircase, he realized there wasn’t anypony around to witness his spontaneous arousal. He couldn’t think of anything that would have provoked that kind of reaction, other than that smell…

                    Taking a couple deep breaths to calm himself down, Spike smiled as his stiffness lowered, returning to its normally recoiled posture. Properly composed, he continued his journey up the stairs, finally reaching the door to Twilight’s bedroom. Figuring she must surely be awake at this time of the day, Spike knocked once before opening the door. “Twilight, I hope you’re awake, there’s no reason you should be sleeping in this late-“

                    Spike chocked on the last of his sentence as the smell he had caught a whiff of on the stairs hit him like a truck, a thousand times stronger. The sight in front of him made the unplaceable element immediately evident.

                    Twilight was sprawled out on the side of her bed, her forelegs in front of her with her hindquarters hanging over the edge of her mattress. Her face was buried in a pile of haphazardly scattered bedsheets, and her horn was glowing brightly, though Spike couldn’t see the focus of its magic. What he did see, however, was Twilight’s hindquarters splayed out in front of him, her legs parted obscenely. Her legs were slick with fluid, and the ground below her was practically a small puddle, covered in  what looked to be the results of several orgasms in the same spot, resulting in repeated gushes of moisture from subsequent climaxes. Twilight’s hindquarters were gyrating back and forth, and Spike heard her moaning into the fabric of her sheets, apparently clenched between her teeth as she groaned and rocked her hips. She hadn’t even heard him come in.

                    Spike’s cock immediately sprang to attention, but he ignored it for the moment.

                    “Twilight? What on earth are you doing?”

                    This finally seemed to catch Twilight’s attention. She turned her head wearily, spitting out the mouthful of fabric as she did so. Her body stopped moving as well, and her horn’s glow vanished as she slowly opened her eyes to find the startled dragon staring at her from the entrance to her bedroom.

                    “Spike?” she mumbled hazily. “What are you… I was…”

                    Spike stood open mouthed as Twilight groggily assembled the pieces of her sentence. Her thoughts felt so blurry. What had she been doing? All she could remember was the thought of bending over for some imaginary stallion to mount her, and how good it had felt to touch herself, using her magic instead of her hooves as she had envisioned that thick cock pistoning in and out of her aching pussy…

                    Spike. Spike was there, her assistant Spike, and he had just seen her masturbating. Twilight’s pleasure subsided as the embarrassment emerged, flushing her face even brighter red than it had been a moment ago.

                    “Oh, no, Spike! Oh, I’m so sorry, I was just…” What could she tell him? That she had spent the entire day flitting back and forth between fruitless research and pleasuring herself? Even on her own body, Twilight could smell how powerful the aroma was. It permeated her entire room, the mingling scent of sweat and her day’s worth of soaking self-pleasure. Her mane was a mess, frazzled in most places and slick with natural oils in sweat and others. Her whole body felt like she’d been rolled through a giant pool of sticky liquid, and the floor was soaked in random places where she had stopped abruptly, needing to cum before doing anything else. Her bed was a catastrophe, pillows and blankets drenched with her juice, and torn up from their properly made places in the fury of her fantasies. And now, Spike was staring at her dripping slit, still soaked from her half-finished session that he had walked in on.

                    The mix of embarrassment and still lingering arousal left Twilight searching for words. She didn’t know what to say. Her brain felt fuzzy again, starting to hurt, like before at the restaurant. She shut her eyes as the pain increased, and her legs gave out spontaneously, sending her falling to the floor.

                    “Unnhh…” Twilight let out a groan, grasping her hooves to her forehead in an attempt to alleviate the sudden onset headache. The fireworks were starting again, electric fireworks, her head felt like it was going to explode.

                    Spike rushed to her downed figure immediately, his erection still at full size as he ran forward, paying it no attention. “Twilight!” he yelled, kneeling down and placing his claws on Twilight’s head as she clenched her jaw, slowly moving her head back and forth. “You’re burning!” he exclaimed, drawing his hand back. Twilight simply groaned in response. Her head, it hurt too much, she had to make it stop.

                    Suddenly, like a damn breaking, the pain was gone, replaced again by the sensation of awakening, a hundred times in an instant. Twilight gasped as the absence of agony replaced itself with the strange feeling of half-aware lucidity. Anything would feel good after the pain of the headache’s sudden impact.

                    “Twilight, answer me. Are you okay?” Spike pressed his claws to either side of Twilight’s face, lifting her head up off the ground. Twilight opened her eyes partially, vision blurring in front of her. She saw Spike’s green eyes staring back with a face of utter concern. “Do you need me to go get somepony, or a doctor?”

                    Did she need him to get somepony… was she alright? Twilight’s gaze floated downward slightly. She saw the piles of books behind Spike, toppled into various wet spots on the carpet… and lower down, what was that?

                    A tingle shot up Twilight’s spine, and she clenched her hind legs instinctively.

                    There was Spike’s hard cock, pointing straight at her only inches away from her face.  Instinctively, she licked her lips.

                    She’d been thinking about that all day, spreading her legs and taking some stallion’s cock inside, getting pounded until she couldn’t stand up, cumming again and again until she passed out. It was always a stallion in her fantasies, a faceless colt ravaging her and sending her body into throes of pleasure beyond belief. But why had she restrained herself when there was a perfectly able-bodied suitor just downstairs?

                    Spike could sense the change in Twilight’s demeanour, at least a shift away from her distress. As long as she was okay, he was happy.

                    “No, Spike, I’m fine... actually, I’m really happy to see you.”

                    “Are you sure?” Spike asked, missing the sultry edge to Twilight’s voice as she lifted her head on her own. Her eyes floated hungrily over the young dragon’s body, lingering especially long on his still painfully obvious erection. Spike was still too concerned for Twilight’s well-being for it to occur to him that his cock was sticking straight towards Twilight’s face. Though he was still just a baby dragon, his member was an impressive length for his frame – not as long as a proper stallion’s, but more than anything Twilight had felt before. She wanted it, badly.

                    “Yes, I’m very sure, Spike. I’m fine. And, I’m about to be even better…”

                    Twilight lunged forward without warning, planting her mouth firmly on Spike’s proudly standing erection. Spike gasped, his body suddenly overcome with a pleasurable sensation unlike anything he’d ever felt before. Despite the overwhelming feeling of Twilight’s mouth wrapped around his dick, he pulled his hips back instinctively, to surprised to let Twilight’s action go without response. “Twilight, what-“ he started, but found his sentence cut off as Twilight shoved him forwards, landing on his back on the carpet and assortment of papers and books with a small ‘oof’.

                    “Hush, Spike. I know you must be hurting, with such a big, wonderful cock like that not getting any attention. Let me make it feel all better.”

                    Before the dragon could respond, Twilight opened her mouth and took the whole of Spike’s length inside it, slurping obscenely as she wrapped her tongue around his shaft. Spike could only groan in response, rolling his head back in pleasure.

                    Twilight didn’t know where any of those words had come from. She was sucking a cock, Spike’s cock. The young dragon she’d raised from birth as her assistant and closest friend, and she had thrown him to the ground and gobbled down his erection like it was a morsel to a dying pony. Something in the back of her head nagged at her, trying to force some kind of remorse, or at the very least an awareness of what she was doing, and how it might be wrong – but the forefront of her consciousness ignored every word. She was in heaven. The first cock she’d ever sucked, and it felt so good. She could feel her juices pouring down her legs again, soaking the carpet below her. So good, she thought to herself, bobbing her head up and down just the way she’d seen the pegasus outside her window do the night before. The feeling of the stiff rod in her mouth was incredible. It was hard, but yielding, and soft on her tongue when she pressed it into the base of Spike’s shaft, nuzzling her nose into his scales as she pushed her head forward, deep-throating him repeatedly. Spike continued groaning, the high-pitch of his still young voice bouncing off the walls of Twilight’s bedroom. He breathed deeply as Twilight continued to suck, and the scent of her overpowering musk hit him again, making his cock twitch in Twilight’s throat.

                    The sensation of his first blowjob was too much. Spike started to thrust his hips upward, clenching his claws into the carpet beside him.

                    “Twilight, if you don’t stop, I’m gonna-“

                    Twilight moaned onto Spike’s dick, prompting him to interrupt his own sentence with a uncontrolled groan. True to his word, Twilight bobbed her head for a few more seconds before feeling the young dragon’s organ twitch, followed by a spray of cum right into the back of her throat. She practically came from the sensation, and didn’t stop moving her head for a second as she swallowed every drop of Spike’s sperm, moaning continuously onto his throbbing erection as she guzzled it down. Spike’s orgasm lasted longer than any he’d had before, which had mostly consisted of the odd errant self-pleasuring session on a night when thoughts of Rarity kept him awake. This was a hundred times better, a million.

                    Finally, the spurts of cum in Twilight’s mouth subsided, and she withdrew her mouth from Spike’s dick with a pop. A tiny dribble of white liquid trickled out over her lower lip, and she licked it up hungrily, giggling to herself.

                    Spike propped himself up on his shoulders. His face was a mixture of concern and utter surprise. Before he could speak, Twilight took the initiative, shoving him back to the ground with one of her hooves. His cock was still hard and bright red, standing up straight as Twilight pressed herself onto it, grinding her chest and stomach up its hard length. Spike groaned again, his eyes closing as the sensation of Twilight’s body made him twitch again.

                    “Spike, I want you, so badly. I’ve been needing someone, anyone to fuck me, all day, and now you’re here, and it’s so perfect.” Twilight whispered the words into Spike’s ear as she pressed herself into him continually, nipping at his ears and neck with each thrust of her frame. Spike could feel the wetness on her lower stomach and the top of her slit as she reached the apex of each movement, and he groaned as the tip of his cock touched Twilight’s moist lips for just an instant each time.

                    “Twilight, what’s gotten into you? This isn’t… we shouldn’t…”

                    “Smell me Spike. Smell how wet I am, for you.” Twilight pressed her body into Spike’s face, and he inhaled deeply, taking in a huge wave of her scent. The unwashed musk of a day’s fervent masturbation floated into his nostrils, and his cock twitched again, now poking against the entrance to Twilight’s hole as she raised herself even higher to give him a full compliment of her smell. “Don’t you want to fuck me, Spike?” she continued, her eyes closed, head rolling around in ecstasy. Even the anticipation of Spike’s cock inside her was driving her wild, she felt like she might die from the thought alone. “Taste me, I want you to taste me, and then let me fuck you. I’ll do all the work, you don’t have to move a muscle, just let me get that delicious cock inside me.”

                    Twilight sounded delirious. She grabbed Spike’s face between her hooves, and he opened his mouth as directed, his long forked tongue hanging out as Twilight continued to rub her sweat body all over the helpless dragon’s face. The taste of sweat and feminine musk drifted over his tastebuds. His cock was now practically swimming in Twilight’s juices as she slid her lips up and down it over and over. The dragon opened his mouth again, perhaps to utter one last feeble protest, but Twilight cut him off with the presence of her own mouth, grinding her lips against his. Her tongue quickly followed suit, and Spike caught himself meeting the motions involuntarily, snaking his long tendril like appendage around Twilight’s warm hot mouth. Twilight was panting, breaking the kiss every few seconds for air, all the while grinding herself up and down Spike’s body, teasing the head of his cock just outside the entrance to her waiting pussy, over and over again, almost in. So good, it felt so good, Twilight’s eyes were rolling in the back of her head, the anticipation was too much, she needed it, needed Spike’s cock inside her.

                    Spike gasped as the wetness finally enveloped his shaft, plunging his head deep inside Twilight’s vagina and bottoming out immediately. Twilight screamed as her hips met Spike’s, and she started to grind herself against the dragon beneath her, aching for as much of as cock inside her as she could get.

                    “Oh, fuck!” She cried out loud enough to shake the walls of her bedroom, sending a stack of papers tumbling off the desk nearby. “Oh, Spike, yes, so good, it feels so good, I need you so much, need you to fuck me, need your cock…” Twilight was babbling frantically now, slamming her hips up and down taking the whole of Spike’s cock inside her as she did so. The dragon’s scales were soaked from Twilight’s moisture, and his claws were digging holes in the carpet as Twilight road him, her frazzled sweat mane swaying back and forth as her head turned with each slam of her body downward. Even though he had cum just moments ago, Spike could feel an ache in his testicles brewing again. The feeling of Twilight’s hot and wet insides wrapped around his dick was too much to bear. Coupled with Twilight’s insane passion and almost detached screaming, Spike didn’t feel like he’d last much longer.

                    If Twilight noticed, she gave no sign. She was in her own world, running her hooves over her own body and screaming out louder and louder with each bob of her flank on Spike’s cock. His hips were thrusting up to meet her, and every time Twilight felt the base of his shaft against her body she felt like she might die. The pleasure was unbelievable. Nothing was in her mind anymore, there was only enough room for focus on the ecstasy of Spike inside her. This was the best thing she’d ever felt. Heaven, bliss, she only wanted it to last for eternity, to go on forever, the most amazing feeling-

                    “Ahhhhhhh!” Twilight felt herself cum without warning, and her world exploded into fireworks again, this time in her eyes, flashes of light streaking across the blackness as she clenched them shut tight. She ground her body into Spike’s with unrelenting force, pressing the young dragon into the carpet with enough strength to move him backward several inches. The clenching of Twilight’s pussy around his dick was too much for Spike to take, and before he could give warning he exploded inside the screaming unicorn riding on top of him. Spike’s orgasm was relatively silent, at least drowned out by the force of Twilight’s cries. Despite his earlier climax, his second load was just as impressive, if not more so, as though his body could sense the nature of the situation. Twilight’s moan turned into a drawn out gasp as she felt Spike’s cock twitch and surge as it filled her with what felt like a gallon of cum. It was enough to trickle out of her entrance, sliding down the length of Spike’s cock and pooling on his stomach as Twilight finished riding out the last of her climax. She grit her teeth furiously, pressing herself into Spike a few more times before finally pulling herself off. Her pussy dropped a small puddle of his cum as she moved, falling backwards onto the floor, now soaked with three different fluids: her sweat, juice, and now Spike’s cum.

                    The pony and dragon both lay on their backs for a minute, panting and gasping for air after their vigorous fuck session. Twilight was the first to move, propping herself up on her forelegs behind her back and staring at Spike’s body, arching with each long breath he took in an effort to collect himself.

                    “More,” she whispered to herself, and moved towards the dragon again.