Spike never thought he'd hear Twilight ask him to masturbate for her while she recorded it, but here she was moments after she'd asked, staring intently while he placed his claw on his stiff dragonhood, laying close beside him on her bed so she could get a better shot for the camera. She watched as he took some of the large amount of what could easily be identified as pre-cum and rubbed it along his tip and tapering length, hearing him groan softly as he worked over the now-slightly-flared spines.

"Drakes appear to create and release pre-ejaculatory fluids just like equine upon sexual arousal, and apparently it is also just as viscus." Twilight noted, having taken some of Spike's pre-cum and rubbing it between her hooves in front of the camera; "It is however a little thicker in consistency and milkier in coloration than recorded instances of equine pre-ejaculate. Perhaps some sperm is released with it, to ensure fertilization even in the case of coitis interruptis?"

Spike then started to rub himself slowly with one claw on each penis, pulses of pleasure surging through him as he soon after rubbed a little harder, his actions growing more intense every second after he passed the lumps the first time and his spines came out. He felt himself getting close quicker than usual, his spines flaring slightly with each throb. It never felt this good when he was doing it alone, but now that Twilight was here watching him, recording him, it felt so much better for some reason.

It was only a minute later before Spike felt his load building up, his spines starting to flare more as his penes swelled larger. "T-Twi, I'm getting close!" Spike exclaimed, his rubs getting faster and rougher, Spike forcing his engorging knots through his claws with each thrust. His force behind each hump was growing more and more powerful as he tried to apparently force his knots into his tightly-clenched claws, with it swollen to the size of a small orange already and rapidly swelling further.

"The drake reports being close to orgasm. We can then see how or if a dragon ejaculates and how it is compared to a stallion's." Twilight reported, feeling her own loins getting hotter still as she watched her son and lover masturbate for her.

The extreme sensitivity to the touch on his flaring spines now made Spike stop rubbing his lengths and rammed his hips forward hard a few times, the last time forcing his knots through and him grabbing behind his now-huge swells, one with each claw. Spike squeezed his eyes shut and gasped as the spines then flared out straight, each now standing out from about a 7mm to 1.2cm, or approximately a quarter of an inch to a half-inch, from his penes as his knots swelled even larger still, each longer than they were before he'd started rubbing himself as she looked down his now-thickly-swollen shafts. Twilight watched as Spike tensed, watching the subtle throb-throb-throb of his members as they visibly swelled up – before he then thrust his hips hard into the air and groaned deeply.

As he loosed his first gush of cum from both members, Spike's first large shots came out hard and rocketed upwards, undoubtedly sticking to the ceiling as Twilight heard a wet distant impact. He loosed another few shots at that high velocity, each joined with a sharp thrust of his hips, two very-hot streams hitting Twilight in the muzzle and also the camera as she leaned over him too far to get a better look as he climaxed, making her yelp at the unexpected and rather hot and sticky semen now sticking to her face.

As she saw him relax again and didn't see any more large streams after the first volley of four, Twilight got closer again with the quickly-cleaned camera once Spike had stopped cumming...or so she thought. When she looked closer as Spike squeezed the sensitive point behind his knots and presumably simulated a mating tie with a dragoness, she observed a number of much smaller throbs and subsequent spurts of semen coming from him even after his main climax, each much thinner and smaller squirt coming out every two seconds and starting to paint his lower belly and her bed with the thin, milky-white fluid. Twilight then used her magic to gather the semen from the ceiling and wherever else it had ended up, moving it to a graduated cylinder for measurement.

"The drake has ejaculated four large globs of semen after forcing his knots through his claws, these actions leading me to presume he instinctively simulated a tie with a dragoness upon nearing climax, with the clearly 'knots' at the bases having swollen greatly to at least nine to ten centimeters, or just over three to four inches, each in circumference now as he 'knotted' himself. At least part of climax seems similar to ponies in action with that being the ejaculation itself, the semen being ejaculated at extremely high speeds into the female and consisting of large amounts of semen, with the main ejaculation of this drake being..."

After pausing a moment to look at the cylinder containing his semen, Twilight finished; "...approximately one-hundred-fifty milliliters in quantity, which is about five fluid ounces. That's about equivalent to a really pent-up stallion in rut, for reference. However, unlike ponies, spines have risen to presumably assist the knot in keeping the penes inside the dragoness or to stimulate her further, possibly to bring her to orgasm or to ovulate, if dragons are induced ovulators."

"The most likely theoretical purpose of a dragoness's orgasm, if they indeed can orgasm, would likely be to bring the semen deeper into her oviduct...if they are as anatomically similar to other reptiles as male dragons are that is, as well as to encourage more ejaculate from the drake. If they are induced ovulators, the sensation of the drake's spines on the dragoness's oviduct walls may trigger the formation and release of ova to be fertilized by the drake's deposited sperm. Unlike pony stallions, the drake also still seems to be ejaculating even after the main climax. Spike, how long do you post-ejaculate like this for?" Twilight asked the spaced-out dragon - and amazingly got a response.

"A-about f-five...minutes?" Spike answered in a dazed tone, each squirt of semen accompanied with another small burst of pleasure for him and light thrust of his hips, with those much lesser in intensity than what he'd gotten from the big pulses, but nonetheless very enjoyable.

As she felt another particularly vicious burst of heat from her crotch, Twilight decided she'd had enough of a show and needed relief of her own. "Spike, do you think you can...y'know...mate again?" Twilight asked, really really hoping he'd say yes.

"Y-yeah Twilight, not a problem. Lemme just...finish first." Spike said as he held tightly behind his knots, riding out his post-orgasm while Twilight could only watch as her snatch burned...or could she...?

"Spike, is there any chance I could..." Twilight started, her tone lustful as she intended to climb on him and ride him while he came...but that might invalidate her study. "...never mind." she finished in a frustrated tone, only getting an initially confused look from Spike, but with it quickly turning into a look of realization.

"Twily, turn off the camera for now and come here," Spike said, very clearly seeing Twilight's need and wanting to help her, though not on camera.

"But Spike, what if..." Twilight rebelled, unable to tear her eyes away from the soft throbs of his penis, the camera trained on each small pulse of semen he released and each slight upwards pump of his hips.

"Twilight, it doesn't do anything different, I promise. Now, come here." Spike said in a more demanding tone, finally seeing the red 'record' light on the camcorder turn off.

"OK Spike, I'm here. Now, what?" Twilight asked after coming to where Spike had indicated, a slightly annoyed look on her face and tone in her voice. He'd called her away from valuable 'research' after all.

"Turn for me, my beautiful little mare." Spike asked gruffly yet gently all the same, seeing Twilight follow his request and turning her rump to him. "Good...now raise your tail..." Spike again requested and Twilight obeyed, flagging her tail over her back revealing her soaked, swollen mess of a crotch to him, her lips now a deep purple-maroon in her extreme arousal. Seeing her like this made Spike feel more dominant than ever, the mare before him needing him badly...

...and he was only too happy to oblige that need.

Spike sunk his snout into Twilight's eager marehood instantly, getting a muffled, surprised whinny from Twilight at the sudden sensation. Her whinny tapered off into a deep moan as she felt Spike's tongue lodge itself deeper into her, her head rolled back and her spine arched, presenting herself for him to get even deeper. So that he did, eagerly.

While Spike kept his post-orgasmic spurting up, he continued to eat Twilight out, getting deep and earning long and constant moans and quiet whinnies from her as she let her pleasure be known. He soon went back to that spot she'd so strongly reacted to before, the one she'd cum from when he'd licked it. When he repeatedly licked there again a few more times, Twilight suddenly tensed up, her clit winking rapidly and her walls squeezing rhythmically. It looked like he'd get a repeat performance, him realizing she must have gotten extremely turned on by him jacking off for her and was already near her peak.

Having worked herself up majorly by watching Spike masturbate, another virtual flood of mare-honey soon followed as Spike licked her G-spot again, Twilight tensing up as she starting to grind her oozing snatch against his muzzle, giving a breathless cry as she started intensely cumming to her dragon for her second time.

"W-wow." was all Twilight could get out, standing some seconds later as her orgasm slowly tapered off, still feeling Spike's tongue diligently cleaning inside her. After a couple minutes more of eating his mare out and making her orgasm again, Spike finally released his grip on his penes, then removed his claw from behind his knot - and a very dazed Twilight watched as his knot deflated, his spines lowered and he stayed fully erect! "S-Spike! How did you do that?!" Twilight asked, quite surprised at the unexpected reveal. She'd never seen or heard of any species doing something like that after mating - to be ready for a second round immediately after the first.

"Well, it always does that after the first time I finish. After the fourth or fifth time, it sometimes doesn't though." Spike answered matter-of-factly, only to watch Twilight's jaw drop.

"F-forth or fifth time?!" Twilight screeched in disbelief, feeling another burst of need as she saw Spike nod, her heat burning harder than ever after three orgasms without a male's seed ending up within her.

Today was going to be a good day, she knew it already.

"Spike, enough studying, I need you to breed me. A lot. I want you to rut me until you can't cum anymore! ...and Spike? Use both." Twilight demanded, placing the camera on the tripod and positioning it properly to get the best possible upward-facing rear angle. After turning it back on, Twilight got on the side of the bed again then watched as Spike got up, then flagged her tail over her back again and left her inviting, winking rump very available to her soon-to-be dragon mate.

"I love you Twilight, and I'd be proud to make love with you...finally..." Spike said in a loving yet huffy tone as he stood behind her and lined up, Twilight feeling his tapered tips once more starting to enter her a second later.

Author's Note

Onwards to the good part!