"Twilight this is your first time, right? Shouldn't I go slow to avoid hurting you when I...well...'pop your cherry'? Spike asked as he stood mounted on Twilight, his members pressed against her winking vulva, with the drake barely restraining himself from plugging her to the hilt at once.

Twilight shook her head, "No Spike it's OK, you don't need to worry about that. Like most mares, I lost my hymen during my first estrus. And besides that, your tongue would have already have done the job even if I were physically a virgin, as far as you put it in me..." Seeing Spike's confused look, she continued; "When I turned ten, Princess Celestia knew I was going to be going into my initial estrus soon, and also knew how intense the first would always be for an inexperienced young mare. So, on my tenth birthday, she not only provided me with all the books to learn all about pony reproduction and multiple masturbation techniques to relieve a mare in estrus' 'sexual needs' for as long as possible, she...well she also provided me with a small...artificial phallus with which to do so with."

"...and when it came she...kinda taught me how to use it....personally."

Spike's eyes widened at that. "Woah, Celestia gave you a DILDO for your birthday, and showed you how to use it?!" he asked, feeling himself throb at even the thought of Twilight using one on herself, let alone Celestia 'helping' her with her first heat! "Do you...still have it?" he asked, a very suggestive tone in his voice.

Twilight giggled and shook her head, virtually reading his mind. "No Spike, that was a small model intended for young fillies experiencing their first estrus..." She then paused and turned to look at him, meeting his eyes; "...I've got a much bigger, full-sized model now. Maybe we can play with it later..." she virtually growled, making Spike's cocks throb against her slit again. "But for now, we need to continue this experiment...I mean lovemaking. Lovemaking!"

Feeling his breeding instincts prodding him on, Spike felt his need rise, feeling Twilight still winking against him. "Uh Twi, can we....y'know...?" he asked, feeling butterflies in his stomach and a burn in his cheeks and loins as he asked.

"...breed?"

Twilight only nodded as she then faced forward and rested her head on the bed, not verbalizing it but her body more than showing she was beyond ready herself. Moments later, she moaned quietly as she slowly felt Spike starting to spread her.

"The d-drake is starting to p-penetrate me with both penes and by Celestia does it feel goooooood!" Twilight moaned out loudly, her clinical tone gone and now replaced by a lustful one, her need finally winning out as she felt Spike entering her and spreading her open; being penetrated by her first real male ever.

Twilight gasped in pleasure as seconds later she felt Spike's tapered penes slowly spreading her wider, so much different then how her stallion dildo felt; the one she had kept well-hidden from Spike and only used when she really, really needed to sate herself during her heats. As she felt him slowly spread her, she realized that while she didn't feel as utterly full all at once as she did with the stallion dildo, the slow and gradual stretching in its place was actually better to her. Twilight kept winking constantly, her clit being rubbed as Spike pressed in, Spike himself moaning softly as he felt her constant ripples and motions around him.

"A d-drake's penis feels v-very different than a stallion, sloooooooowly spreading me open unlike a stallion instantly filling a mare's vagina, a m-more gradual spreading as he sinks sooooo deeeep in me". Twilight couldn't help but moan again during her reporting of what she was experiencing, her over-sensitive passage sending bursts of pleasure through her as her body rewarded her for accepting a stallion to breed her. Though it wasn't truly a stallion, it didn't care: all her body cared about was that her marehood finally had something warm and pulsing inside of it, eagerly clamping down on it and pulling it deeper to prevent it from getting away.

Twilight was not at all unhappy however at being only slowly spread like she was, not at all displeased at the gradual spreading as opposed to being so suddenly full, especially as he got deeper and his taper started to grow larger. By the time Spike had nearly hilted her, he'd surpassed the depth that her ten-inch dildo could reach, with him seeming much longer and thicker than he looked once he'd first entered her.

"The dragon's penes have undoubtedly s-swelled further and increased in diameter and length at least s-slightly since initial penetration, the warmth of my vagiiiiina apparently setting off something we haven't seen before; extensive s-swelling of the penes in reaction to a-actual penetration! He has inserted at least twenty centimeters and is still going!" Twilight reported, feeling herself being slowly filled more and more as his lengths swelled within her. As she finally felt the lumps at the bases pass her vulva and enter her, Twilight felt the spines rise suddenly, feeling them press again her inner walls; not being sharp at all and indeed quite flexible, but instead making her sharply gasp in pleasure at the sudden, intense sensation.

As Spike pulled out the next time, both he and Twilight cried out suddenly and simultaneously, both experiencing extreme pleasure and Twilight some minor pain as his sensitive spines softly raked her foal-passage. Twilight felt those nubs now rubbing deeply into her hyper-sensitive walls as she clamped down in reaction and sending a mind-blowing amount of sensation through her, that one rub feeling nearly orgasmic in intensity and making Twilight yelp again.

"T-the rear-facing spines on the penes have -mmmm- expanded outward upon full penetration, s-strongly stimulating my....ooooooh Celestia...vaginal canal. I-It seems they are a-at least p-partially used in dragon b-breeding to f-further stimulate both the drake and d-dragoness during mating, m-much like the m-medial ring in p-ponies." Twilight said staccaic, her head tilted back as she felt Spike softly nibbling on her neck now, slowly licking with the ticklish tip of his tongue as well and making her alternately giggle and moan at the combined sensations. She felt herself wetter than ever before, Spike making a loud, wet slap against her each time he thrust in, feeling herself winking near-constantly now with her muzzle buried into the pillow.

"T-Twi, you feel....REALLY good inside. T-tight and so hot!" Spike finally spoke for the first time since they'd started, feeling the same intense sensations as Twilight did as he felt his sensitive spines and rods being rubbed by Twilight's tight, ribbed passage as he pulled out. The sensations made him instinctively clench her hips tighter and ram himself right back in upon pulling out some, feeling his penises being stimulated that much more and making him throb constantly now as he felt her inner muscles constantly working over him, milking him strongly.

"Oh C-Celestia the d-drake is...so...uuuugh." Twilight finished with a moan, her rational mind shutting down as she was overwhelmed with so much pleasure, wave after wave washing through her; each push in filled her so full of her Spike, and each pull out making his spines pleasantly rake against her walls. Twilight decided the reporting could wait until after, now simply giving in as Spike fully entered her once more, relaxing and raising her rump higher as she let her 'stallion' breed her, feeling him go deeper as a result.

As Spike pulled out to his tip again, he instantly plunged back into Twilight, his breeding and hoarding instincts both taking hold now as he hilted in her again. He wanted Twilight more and faster, and he was going to take her. As he started to hump harder, he let his greed take over, intending to take her as hard and as long as he wanted, and quite sure she wouldn't protest.

The swellings at Spike's bases were increasing and his tapered tips were now tapping against her cervix as he apparently swelled even further, the depth and speed he was going causing Twilight's mouth to be wide open but nothing to come out. She was speechless, in a world of ecstasy she'd never known before as those tens of tiny ridges rubbed deeper into her sensitive insides with each thrust and pull out, stimulating her beyond anything a stallion could ever even dream of as she felt them growing ever-so-slightly more ridged as Spike grew closer to climax.

Spike constantly pounded into Twilight, each throb of his penes causing his spines to flare slightly more for a second, with it not un-noticed by either. Both were quiet except the occasional grunt, gasp or moan from either or pillow-muffled whinny from Twilight, both too overtaken by their actions to even think let alone speak, only their instincts driving them now.

Spike's urges took over more as the seconds of pure ecstasy ticked by, each more and more rapid hump into her feeling like a mini-orgasm to Twilight as her passage constantly spasmed and winked around Spike, the extreme stimulation of his spines gently scraping inside her every time he pulled out nearly too much pleasure for her body to handle.

At about the one minute mark, Twilight felt Spike's knots growing more each time the lumps passed her lips, making it harder and harder for Spike to pull out each time. After he barely pulled out the last time it had entered her, Spike came-to enough to realize that his knots were starting to get huge and his pulses more insistent...and knew what that meant. "T-Twi, I'm close." Spike told his mare as he stayed only partially buried within her, knowing that his next full thrust in would likely be his last.

Twilight was already pleased beyond all belief at her dragon's heavenly members, having felt countless mini-orgasms during his thrusts and now more than ready for a real one; ready to receive his seed. "Spike, i-it's OK. You can finish...inside...f-for science. For m-me." she panted encouragingly, reaching back to give him a kiss on the forehead as he leaned over and held her tight to him, her marehood's near-constant winking and clenching letting him know that she was ready too.

With a few rough final thrusts, Spike gave his all to the last one and forced himself into her for that last time, pressing his lips tightly to hers in a kiss as he did and making both of their mind promptly explode when his knot was forced inside her with a quiet pop.

Twilight came so hard that it made the previous powerful orgasms Spike had given her with his tongue seem like twinges of pleasure in comparison; the pure, white-hot tsunami of an orgasm overtaking her as she not only felt Spike's spines flaring out further and seemingly into every sensitive point her vagina had, but also his large lower spines expanding as they spread her wider and dug deeply into the very sensitive first few inches of her vagina. His knot meanwhile grew too big to pull out, locking them together until his orgasm was finished.

Twilight couldn't help it as a high-pitched squeal of pure pleasure pealed out of her, followed by a loud whinny as her brain was saturated with a massive flood of endorphines, feeling Spike's knot swelling even further inside her now that he was fully buried. Twilight was unable to hear anything, see anything, feel anything except those wonderful, wonderful penises buried in her as she squeezed and clenched over them, feeling the spines pressed firmly into her walls as they grew ridged, his length then starting to swell and pulsate more. She felt him growing thicker and longer still, moving even deeper into her until his now-not-so-thin tips were pressed very tightly against what must have been her cervix, before slipping painlessly just into the relaxed sphincter and filling her entire tract with dragon cock.

Twilight was still spasming in her orgasmic throes as Spike starting to twitch within her, before soon feeling a very strong series of pulses from his members. Her second whinny was joined by a deep, dominant growl from Spike as his own orgasm started. His first jets of very hot semen rocketed through her penetrated cervix and into her womb, making her cry out again. Feeling each powerful impact slam against the top of her foal-oven, that sensation of extreme heat so deep inside her body, sent her careening off again into yet another explosive orgasm.

Twilight's mind literally blanked as she started her second orgasm within thirty seconds, all the while feeling those wonderful spines still lodged against her walls, each pulse of his lengths inside of her or clench and wink of her passage making them dig slightly deeper for a moment and send another nerve-wracking surge of ecstasy through her.

After Spike's first four huge gushes coated her womb from the top down in his extremely thick, sticky, and hot dragon cum, Twilight felt as Spike's penes continued to pulse within her, but now more softly and at a lower frequency. His knots both kept him trapped within her, still filling her with pleasure beyond belief as his smaller squirts of semen filled her further. She could feel the small, hot spurts pass her cervix then start to ooze down along her womb, starting to pool at the bottom.

Twilight cooed as Spike held her closely and remained knotted in her, both in a state of perpetual bliss as she felt that soft squirt squirt squirt deep within her accompanied with a small twitch each time, every gentle throb making his spines rub inside her each time and making another surge of strong pleasure ride her spine, her body responding with a wink and a tight clench in return. She then felt his lips and tongue working along her neck as he seeded her, showing his affections for his mare as she merely lay there limply, exhausted and happily accepting it all.

About five minutes of softly pumping more of his seed into Twilight, having been cuddling and kissing during the tie, Spike's knot finally reduced enough to pull out...but instead of pulling out for long, he swiftly got to work on round two.

"S-Spike?! What are you...?" Twilight asked in surprise as Spike then flipped her over on her back after pulling out of her, positioning his still-hard cocks between her legs before he swiftly started pounding into her again, making Twilight squeal in ecstasy as she felt his spines flare out again when he hilted her. Twilight couldn't take the feeling of him filling her so full at once and his spines scraping against her now-extremely hypersensitive passage again, the over-stimulation sending another intense wave of orgasmic pleasure through her as she came again, now feeling one of his top ridges of spines rubbing deep into her G-spot with every pull out in this position.

Twilight could only think back to the recounting of the dragoness observed by that one pony, and how she had a very pleased expression and smile on her face. Twilight could now say DEFINITELY that dragoness was mostly cumming her womb—or more likely oviduct, as in the case of other reptiles—out just like Twilight was as that dragon pumped her full, as Twilight had what must have been an exact copy of that expression as she was held tight by her drake's loving claws, filled full of him and clenching once more on all he had to offer in orgasmic bliss.

Spike continued to mate his mare roughly for another minute, constantly ramming Twilight hard and making her climax and writhe beneath him frequently as his spines worked their magic on her clenching walls, this position allowing him to get very deep within her even before he started swelling more. Spike himself clenched his eyes shut as he felt himself softly pulsing within his mare with each rough thrust in, feeling his spines being so slightly, deliciously bent and his swollen lengths gripped so tightly as her tight passage caressed his dragonhoods, sending shockwaves of pleasure through him as well.

It wasn't long before Spike felt himself nearing his peak again, aided by Twilight's constantly spasming pussy as she kneaded his further-swelling length, with her more often than not riding another intense orgasm, her sounds and whinnies of extreme pleasure revealing all. He gave her all he could as he felt himself at his limit, giving another few very rough humps before moments later hilting himself again. He could feel himself tensing as his knot swelled, his spines fully flaring again as he gave another dominating growl, biting down softly on Twilight's ear as he started pulsing in her and his own pleasure exploded again.

As she felt Spike climax inside her again, Twilight came once again as she felt his spines press deep into her passage and his knot seal them together as his tips once more passed her cervix, another few strong pulses of his extremely hot cum blasting directly against the top of her womb again, followed by countless small gushes as she could only lay there squirming and crying out, cumming again and again to her number-one assistant, drool trailing down her face and neck as her mind virtually blanked out. Whether the drool was his or hers was not known to either, both too spaced out in orgasmic bliss to know anything other than their pleasure.

~

After a short while, Spike pulled out of Twilight this time when his knot deflated enough, both panting as his fluids-covered members still stood hard, his mare-cum-soaked lengths now getting another good looking over from his mare, with Twilight observing that they'd grown at least twice as large in diameter and half more in length than before they'd had sex, his knots still swollen huge and making her scarcely believe they were even bigger inside of her mere moments ago! "By Luna Twilight, that was..." Spike started but could only give a soft shudder to finish, no words able to describe accurately what he'd just experienced.

Twilight could only lay there as she looked blankly up to the ceiling, still dazed and panting, feeling so lovely and perfect now with her love's hot cum deep inside her again. After a moment of cuddling with Spike on her side, she finally turned over on her back again, shuddering lightly as she felt the cum that leaked into her passage slide a bit deeper again, with Spike's post-ejaculate thinner and more watery than his main loads that were still coating her womb, using some spare pillows to boost her rear even higher to encourage his seed deeper into her body.

Instead of saying anything in return to Spike's earlier partial-statement, Twilight simply reached over and pulled the young drake on top of her, meeting her muzzle with his again in the passionate kiss they'd left off. After a few minutes, Spike finally broke the kiss again, now simply laying on top of her, loving the feeling of her soft fur and warm body against his chest.

"Well, I don't know about you, but I need a drink." Twilight finally mumbled out, sitting up and concentrating her magic down to the kitchen, retrieving something from the refrigerator. Moments later, Twilight levitated in a pitcher of cold lemonaid and two glasses, pouring one for each.

After their short break and drink, Spike stood and looked down at Twilight, whom was still laying on her back on the bed; his eyes trailing from her eyes to her muzzle, down her neck and underbarrel, down to her teats, and finally ending at her sticky, still-soaked marehood. As he felt his breeding instincts kick in again, he himself still hard from earlier, his erections having never died down even through the break they took.

As if on cue, Twilight felt as her belly started that slight burning itch again, wincing at the sensation of her heat slightly flaring. "Hey Spike?" Twilight asked, with the drake quickly looking up from her crotch and meeting her eyes again; "You think we can go again?"

Spike quickly responded with a large smile and rapid nods, quickly climbing onto the bed and mounting Twilight as she still lay on her back, lining himself up as Twilight slightly squirmed in anticipation. A second later Spike slowly started to insert himself again, earning Twilight's forehooves wrapping around his long neck and a deep moan from her, finding her pulling him into another kiss as he started to sink deeply once more.

~

Spike had proceeded to breed Twilight twice more before he could no longer get erect again, cumming the same huge, hot amount in her each time and making her climax countless more times herself as he'd fully bred her to his body's content. After he'd pulled out the last time, Spike lay beside Twilight as she reluctantly drained of his post-emission, with her body simply too full to hold all of his thin post-cum. But all that truly mattered to Twilight was that her entire womb was thickly coated and filled with the sticky globs of his main load, with that centralized sensation being all she could really focus on.

Kissing and cuddling his mare, Spike rubbed her now-domed belly from behind, shuddering as he felt that lightly-swollen globe and realizing that he'd filled her beyond normal capacity the last two times he'd climaxed in her. That he'd made her expand to accommodate the massive amount of dragon cum he'd pumped straight into her womb, knowing that its sticky composition would have coated the eggs inside a dragoness, or kept it there until it ensured conception when she ovulated, then eventually would be absorbed by Twilight's body. At least that's how it would have worked in a dragoness...

"Spike, I love you so much." Twilight said in her post-coitus daze, utterly exhausted but beyond satisfied as she felt her heat completely quelled now, not even a trace of it anywhere to be felt. All she felt was her dragon's hot cum stretching her belly out and the thinner post-ejaculate oozing out of her marehood onto the bed, the feeling of utter fullness and creamy wetness throughout her whole tract and on her rump satisfying her on a very deep level.

"I love you too...Mom..." Spike said, patting her belly affectionately, Twilight now knowing that him calling her 'mom' could possibly have a double meaning. As she lay there, Twilight could only wonder what her heat now being gone meant, wondering what this breeding may have caused as the legends of the kirins came back to her; legends of that species born long ago from the love of a dragon and a pony, but for so long lost that it was just assumed as myth now.

Did Spike just get me pregnant? Twilight wondered, but as she cuddled up to him, she realized that she was totally OK with any results of this. She loved him and would be proud to bear his child or children, if such a thing was even physically possible. Twilight soon after reported exactly what she'd felt during and after the mating aloud for the camera, with Spike also putting his two Bits in about it, giving both sides of the story for documentation.

After finishing and shutting off the camera, Twilight yawned and stretched out, her eyes hooded as she gave Spike a dazed, very tired smile before tucking her muzzle into the crook of his neck and jaw. "Night night, Spikey." Twilight's muffled voice said to him as he held her in an embrace, their tails intertwined together under the covers as they cuddled in their afterglow. Twilight felt her eyelids growing heavy as she cuddled against the warm scaled belly of her lover, her son, her Spike, closing her eyes and soon after drifting to sleep in his warm embrace.

Author's Note

...and it is at this point I realize just how comparatively boring human sex is...*sigh*

I have about one or two more chapters planned for this, but haven't completed them yet. As usual, I will 'eventually' complete them.