“Oh curse these blasted numbers!” Doctor Whooves shouts out loud as he looks over a whiteboard filled with numbers and algorithms of one color overlapping numbers and algorithms of several others. “I’ve run the formula through several times! Plugged in the right numbers! Tried to change how the slopes meet each other! Done everything I can possibly think of, but nothing makes a bloody hint of sense! Curse you high math!”

The brown earth pony throws the marker at the board, seeing it bounce off of it and land on the ground as he rubs his head with his hooves, trying to calm his mind down to make sure it doesn’t go into an academic meltdown, a condition where he would mind fuck a problem to death for long enough to force him to give up on the problem. He groans softly as he makes his way upstairs towards his bedroom which overlooked his laboratory and plops onto his bed and closes his eyes.

He breathes while resting his head on the pillow of his bed and tries to think calmly, relaxing his mind, reminding himself of lessons taught to him by a helpful assistant he had at one point in time. She nearly saw him go into an academic meltdown, but it was avoided with her telling him to take deep breathes and think of thoughts not related to that subject that got him worked up in the first place.

A few moments pass before his mind calms down a bit to the point where he could open his eyes and look at the ceiling, filled with models of various planets and celestial bodies that he had studied through his telescope during his time here in Ponyville, and talk to himself. “I think I feel a bit… better now. But I still need to calm myself down more… but how?” He asks himself softly before looking at one side of his bed, towards a table next to it with his signature instrument, the Sonic Screwdriver, resting on top of it. He presses a red button on the device and sees the end of it light up, making his eyes become glued to it like a curious foal discovering something new for the first time. “After all these years using this thing, I’ve never actually looked at the light long enough to see how… interesting it was. Perhaps I was too concentrated in fight various demons and enemies across the space time continuum that I never got a chance to do such a thing,” he chuckles as he lets go of the button, the light disappearing from it.

After a few more moments of looking at his Screwdriver with fascination, he looks at the bottom of it and discovers a small green switch on it, a switch that he had never seen on it before until now. “Hmmm, how come I have never seen this before?” the Doctor asks himself, curious about what the switch does. He flicks it on and feels the light go on again, but makes Screwdriver vibrate, a feature he never knew it could do on its own.

As he feels the vibrations emanating from the device, a rather… peculiar idea crosses his mind. “Maybe I could stick it… in there… and maybe see how it feels inside me? Oh bother! Why am I thinking such a thing!” he curses at himself, trying to dismiss the seemingly ridiculous idea. “I’m a Time Lord for the Continuum’s sake! I don’t have time to do such a… a pedestrian thing such as this!" However, as the thought begins to sink into his mind more and more, he begins to lower his voice a bit into a calmer tone. "But then again… I’ve never attempted to do such a thing and it could be pleasant.” He thinks to himself for a moment, taking a few deep breaths, feeling the vibrating Screwdriver in his hoof as he eyes his flank. “Maybe this one time won’t hurt…” The brown stallion shrugs to himself and lifts his flank into the air and positions the device near his puckered tail hole, moving his tail to the side. “It's now or never…” he says and slowly inserts the device into his hole and feels the vibrations tingle his lower body. A quick shiver escapes his lips, feeling the pulsations inside of him rather… interesting.

“O-Oh my... This feels so… exquisite…” the Doctor moans as he gently and slowly thrusts the device, now acting as a sex toy of sorts now, into his tail hole and begins to pleasure himself. The toy was not wide or as long as a normal stallion’s cock, but made up for it with seemingly enjoyable vibrations. He closes his eyes to enhance his pleasure levels, beginning to feel the stress melt away from his academic mind. He becomes so lost in his own pleasure, he doesn’t feel his cock slowly slip from his sheath and poke him in the face.

“Now how in Equestria…?” he asks, noticing how long his cock was; a bit longer than a normal earth pony, being over a foot long and about two inches wide, by his best estimates. “I never knew I was this… big, for a stallion. I guess I never really got a chance look at and examine it first hoof.” As he looks at his dark brown member, he notices he can bend his back far enough to put the few inches of himself into his mouth. He lures his own cock into his muzzle with his tongue and begins to suck on his cock’s head. As he begins a self fellatio, he feels a sense of uneasiness come over him, mostly due to the fact that he was sucking himself off. But those feelings were being replaced by feelings of pleasure. He never knew that a feeling such as this could be so… relaxing, if that was the word he was looking for.

Once again, he closes his eyes and bobs his head on his member, moaning at his own salty flavor, feeling the sensation inside his tail hole begin to increase as the pulsations become deeper and longer, feeling a slight tingle in his balls. Was the Sonic Screwdriver starting to know it wanted to become a sex toy and knew the Doctor liked this and decided to act this way? Or was that just inside the Doctor’s head and a bunch of poppycock? Either way, he pushes his cock up to his medial ring into his mouth, sucking on it himself. His tongue runs along the flared head of his shaft, sending deep tingles down his spine, spiking his pleasure levels and making him shiver softly.

He slowly opens his eyes and feels a deep red blush come across his face, seeing his saliva on his cock, up to the medial ring, while letting out a soft moan as he feels the vibrations inside his tail hole become faster and the blue light from the Screwdriver become brighter. A soft “glug, glug” escapes his lips, along with a few strands of saliva, traveling down the sides of his muzzle as he continues to thrust his member into his mouth. Why was he enjoying this so much? Why hasn’t he done this before to himself? Why was this feeling making him so… horny? These were a few of the questions running through his head as he continued his own blow job, feeling a tickling sensation in his balls become stronger and stronger now.

After a few moments of enjoying the toy inside his tailhole, he feels something in his orbs begin to churn. He lets out a muffled moan as he continues to thrust himself into his own mouth, running his tongue along his sensitive head, seeming to speed up the pleasure for him. “Glug! Glug! Glug!” he moans, shutting his eyes again, not wanting to open them again until something happened; something that he wasn’t able to explain what would happen until it happened.

He continues his motions for several moments before the vibrations inside his tail hole prove too much for him to handle as his puckered hole clamps down around it and a sensation rushes along his balls and through his cock. Seconds later, a strange, thick, milky liquid begins to squirt into his mouth, making his eyes open wide as he looks at his cock pump the milky liquid into his mouth. This liquid was unlike any liquid he had tasted before and really couldn’t describe how it felt or how it tasted. Whatever the case may be, he let out a soft breath through his nostrils as he sees the last of the liquid pump from his cock and onto his tongue before he swallows the load and lets his cock free of his muzzle and rests his flank on the bed again, the toy continuing to buzz for several more seconds before it mysteriously dies down and turns off by itself.

“Great withering stallions! What was that sensation? Why haven’t I experienced this kind of pleasure before? It felt so… so… enjoyable!” the Doctor exclaims after gathering his thoughts about what he had just felt, feeling his now wet, flaccid cock rest on his belly as his tail flicks up softly.

He lets out a soft coo from his lips as his front hooves rest on his belly as he grins, thinking about the pleasure he had just given himself. “I guess… I should do this more often if I want this sensation again,” he says to himself as his eyes become heavy with thought and sleep, a yawn following soon afterwards. “I wonder… if that felt good by myself, imagine what I could do if I had somepony else help me with this. Maybe I should explore the option of a… partner of sorts liking activities such as this to elope with? It’s a thought, but for another time perhaps…” he grins to himself as he peacefully closes his eyes as the post orgasmic bliss of his self given fellatio slowly rocks him to sleep.

Author's Note

Like I said before, I wrote this in about an hour and a half after I saw the picture on R34. Can't link it because of rules here. So... better look it up on your own.

It may feel a bit rushed, but still, hope you enjoyed it!