Author's note: the author does not condone rape or any other form of abuse or sexual assault depicted in their work, in much the same way mystery writers do not condone murder. This also applies to monster/inhuman coupling and any distant relation to bestiality. If any of these topics are a trigger or make you otherwise uncomfortable, please look elsewhere; there are plenty of amazing works on this site that will meet your needs better than this one.
Please also note that this work features a transgender man as the main character; while references to his body are kept as genderless as possible, there's no avoiding the fact that his vagina is heavily involved, and the creature fucking him sees him solely as that hole. If that's a deal breaker, there are once again plenty of other works on this site for you to enjoy - and the author would love recommendations, as they find their transmasc TBR rather dry, at the moment.
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Never leave your window open on a full moon,
the witch remembers, too late to do anything about it,
or the werewolves will smell prey, and there will be nothing you can do.
Growing up, he'd had it drilled into his mind over and over what the dreadful creatures would do to anyone with a womb, functional or not. When he'd first come to this forest, he'd hoped he'd finally gotten far enough away from any of their hunting grounds that he would be able to live his life freely after dark. Hoped that he could continue on without worry of the things he'd rather forget, now that he'd abandoned his old life and changed his name, taken droughts to rid himself of the burden of pregnancy and breasts.
And in his defense, he'd never been good at telling when the moon was truly full, rather than on the way to it, and he'd had his window closed the last few nights. The clouds were thick enough overhead that he couldn't tell, for certain, whether the moon was out in her utmost glory.
Couldn't, until he woke a few moments ago to a howl just outside his lonely cottage, and found sharp blades of moonlight cutting across his blankets.
He'd gotten up as quickly as possible, of course, and started scrambling to write a rune of warding in chalk around his bedroom door. But just as he was reaching up to the top of the frame with hands shaking with terror, the door burst inward, and he was thrown onto his back on the floor.
And now, here he was: caught in the midst of crawling away, with his face now bathed in the uncaring light of the moon, as the beast with its paw in the middle of his back started to rip away at his underclothes.
His heart hammered in his chest. The cloth around his loins fell away, and he hissed at the sting of a cut where back becomes butt.
The creature growled, curling one massive hand around his hip. Loosened the pressure between his shoulders, and tugged his ass up sharply. He managed to brace himself on his elbows, catch the breath that was hard to get while pinned beneath the monstrous weight.
Something long and slick fell across his ass and lower back, and his blood turned to ice.
"No," he breathed, knowing the monster did not care, even if it understood. "No, no, no--"
The thing started easing its hips back and forth, rubbing its length up and down the seam of his ass cheeks as it grew slowly harder and harder and warmer and warmer. His breathing quickened as it grew, panic gripping his heart as it became clearer and clearer that it wasn't stopping at a length he'd ever taken before.
By the time the creature pulled its hips back and made its first attempt at entering him, its cock was easily half again as long as his forearm, and about as thick around as his wrist.
Its hips shot forward, sharp and eager. It missed, jamming its tapered head against the apex of his entrance instead, before running its entire length along the sensitive nub. A grunt ruffled his short hair, as the thing pulled back and tried again, missing once again but driving forward so hard that its hips slapped against his ass obscenely, anyway.
And then it pulled back again, and this time, it thrust home.
He screamed, as the massive cockhead parted his lips and jammed itself as far in as it could get. White-hot pain blinded him for a moment, and, forgetting himself and his situation for just a second, he clawed at the floorboards, trying to wrest himself free of the rod in his core.
He managed to get a few inches, forcing the cock inside him to back out until just the weeping tip was still inside him, before the monster pounced forward again, shoving even more of itself inside on the second thrust.
The man cried out again as his breath was forced out of him, and was cut off by one large, hand-like paw wrapping around his mouth and chin.
The creature growled a warning, claws of the hand still wrapped around his hip digging into his skin, before pulling out once again until its head circled the man's entrance, rubbing against his bud firmly.