No over yet

Through an incredible effort of will, you manage to hold back the torrent inside your balls as Twilight twitching around your cock slowly come to an end. After a final spasm, her legs give out under her and she fall face first on the ground, too tired and racked with pleasure to notice. Your member was as hard as ever though, stuffed deep inside her. It felt like a burning furnace, her moist walls burning against the hard skin of your shaft.

With a grunt, you lift Twilight up, raising her little plot up with your cock and her head with your mouth.

"W... what are you doing Big Mac?"

Twilight barely manage to say between two ragged breath.

You answer only with a low growl as you carry her from the ruined table and puddle to the front door. All the way there you feel Twilight rub slightly over you cock with each step, letting out little cries each time your meat pole moved inside her hyper-sensitive cunt.

"B... Big Mac, w... why... Ah!"

You shut her up with a sharp pull on her mane and a quick stroke, distracting her long enough for you to unlock the door and slightly pry it open, a dozen inches or so at most. Just enough to let light in and get a glimpse of outside. Plenty enough to hear and be heard though.

"Mac no, people will se me."

She plead to you, but the way her pussy tighten around your meat pole tell another story entirely.

"Eyup."

Without waiting for another false beg you slam her down on the ground and ram into her with all your strenght. She let out a sharp scream before bitting down on her legs to try to muffle it. It did her no good as you adopted a new pace, slowly pulling your prick backward until only the very tip was inside, then slamming it all back in in one push.

"Fuck! Fuck! Fuck! Fuck me!"

If before she had been a mess, now she was a complete wreck. Her tongue was hanging out of her open mouth, flapping about as you pounded her cunt as roughly as you could, drool coming out and dripping down her chin.

"Nooo! Stop it! People will hear me! They will come and see me getting fucked!"

"Eyup."

You switched your pace, going from slow pull and hard push to a frenetic pounding that turned her protest into a disarticulated moaning. Her legs and arms were flailing about on the ground, frantically looking for something to grab on. You pinned them down, feeling her muscles tense under you and her pussy ripple as she let out a piercing shriek. You are not Big Mac anymore, you are just a stallion trying to impregnate a restless mare, rutting her on the ground, plowing her wet deepness, each stroke pushing against the barrier to her womb.

"Ah! Ah! Fuuuckkk! Princess Celestia will banish me for being a slut!"

You lean down to bite her ear.

"Pregnant slut."

"Nooo! The spell is only good for one orgasm. Pull out!"

You only start to pound harder as you feel a pressure rise inside your balls and her ready cunt melting under your savage ****.

"No! Please, pull out, pull ou! I'm gonna get pregnant."

She was twisting and shaking under you, wailing each time you buried yourself inside her, wave of heat coming from her dripping twat.

"You are going to get pregnant and everybody is going to see it."

You reach out while keeping up your rough fucking, opening the door even more, enough for her to see a part of the street.

"Twilight the slut."

The moment you said this, she exploded into a moaning, whimpering, screaming mess of ecstasy purple goo. Her cunt gushed mare's juice on the ground as her inside twisted and tensed, gripping your cock. With a primal grunt you bite down on her neck and jerked her backward, arching her back into a lewd arch as your ball tightened and you feel your own orgasm rock through your body. Sperm start to rush from your cock, shooting into her weakened womb and filling her up. Your seed flow into her like a torrent and soon you feel the pression push against you, trying to push your shaft out. You resist, driving it even deeper into her and extracting another pleasure sob from Twilight. You hold on tigh to her shivering form as the content of your balls is sucked by her hungry cunt, making sure to fill her womb to the very brim and more.

When you finally pull out, there is a big slick sound and jizz start flowing down her gaping pussy and forming a puddle between her legs. You nod to yourself at the sight of a job well done and a panting Twilight lying down on the floor, her belly showing a noticable buldge. Satisfied in all the right ways, you trot back to the table and pick up the book on Earth pony enginerring before coming back.

"I'll bring back the book when I'm finished with it. Bye Twilight."

She could only answer with a weak moan as you walked over the wrecked mare, open the door all the way and leave the library, taking care to not close the door.