Thinking about a poor soul who's, for some reason or another, irresistible to a myriad of magical creatures/beings looking to knock them up and it leads to them going through several rapid-ish pregnancies all at once.
First he gets pinned down and stuffed by a werewolf on their evening stroll. Spread wider than he's ever been by the werewolf's thick knot, unwillingly cumming again and again as it savagely thrusts into the most sensitive parts inside of him over and over. Leaving him bloated with its cum, and unknowingly already growing its litter in their womb.
As he begins to limp home an ethereal being offers comfort and a helping hand. The kind beings cool soothing touch calming him down and making him feel safe. He's brought to the beings abode where more beautiful people surround them, their soft voices lulling him into a relaxed state, comforting him as his belly gently begins to swell, their hands roaming each newly stretched inch of skin. Soon their hands explore lower, making him feel so good, and they're taking turns entering inside of him, cooing over him and encouraging him every time he cums. They kiss his forehead and tell him he's already doing such a good job growing big and round for them. Eventually he begins to come to his senses, and insists he needs to go home. Then he stumbles out of the trees about an hour before sunrise. When he checks his phone it's 3 months later, and it's abundantly clear he's just entered the second trimester with both a litter of werewolf pups and a litter of faelings in his swollen womb.
Stumbling home, adjusting to the weight of two separate litters in his belly, he startles when he spots a creature, clearly alien in nature. He's scared for a moment, but then sees that the alien is clearly in distress, its belly almost as big and swollen as his and appears to be cramping something fierce. He winces and places a hand over his own womb in sympathy. Suddenly the alien's gaze locks onto him, and before he can even begin to run, the alien is upon him, much faster than it ought to be as weighed down as it is. The alien enters him roughly, needily, and soon to his horror he understands why, as an egg about the size of a tennis ball moves through the alien's ovipositor and forces its way into his already crowded womb. The alien makes a guttural screech that sounds like relief as they continue to pulsate inside of him, depositing its long overdue clutch inside of a clearly fertile incubator. By the time the alien is done, abandoning him now that its needs have been met, his belly is twice as big as before.
He laboriously shuffles to the nearest doctors office he can find, his back already killing him from such a sudden change in weight and balance, and he arrives as they open panting and out of breath. The doctor ushers him in straight away to their exam room, lying through their teeth when they say they'll help him. The mad scientist he was unlucky enough to find so quickly, marvels to themselves at his fertile womb, and decides he's the perfect test subject for their latest experiment. They make a big show of appearing kind and helpful, while delighting in every moan of pain and discomfort as they poke and prod at his gravid form. While checking between his legs, insisting on making sure he didn't sustain any injury, they apply a ‘soothing gel’ deep inside of him, the beginnings of their newest monstrous creation. And just for fun, before he leaves they give him a couple of ‘preventative vaccines,’ one of which makes sure that he stays hyper fertile, and the other which ensures that every new offspring added to his belly grows to catch up to be as far along as the rest. It's not long after he waddles out of the doctors office that he's whining in discomfort and dismay as his belly begins to rapidly swell again, the ‘vaccine’ kicking in, causing the ‘soothing gel’ to rapidly approach the second trimester as well.
So distracted on his way home by his already overcrowded womb, wondering with dawning horror how much bigger he's going to get, he fails to realize he's crossing under a bridge. Specifically a troll's bridge. Who, upon learning our poor soul can't find his wallet, gleefully insists on using him like a flesh light as an alternative form of payment. The troll finds it amusing that his belly has become so cumbersome that they can barely hold him in their one hand. And they laugh uproariously as he moans and sobs and cums as his sensitive belly, and frankly his now swelling chest, bounces as they harshly drag him up and down their cock. But their greatest delight is after they've flooded his insides with their cum, settling back with him still sitting on their cock, so long and thick they've burst through his cervix and can feel the first stirrings of the litters inside of him around the head of his cock. Not only can they feel their own half-troll bastard growing in the guy's womb as well, they get to watch as he futilely tries to get off their cock, begging for help that won't come as, already too heavy and exhausted to lift themself off, even before his belly began to visibly swell again, only succeeding in clumsily riding the troll's cock rather than escaping them. By the time he's manages to leave, he has two troll bastards weighing down his womb, and it's already afternoon.
Trying to take a short cut home, desperate to find safety and comfort, he runs into a rowdy gang of goblins that surround him and delight in teasing his helpless form. Slapping his belly, his cum-stained thighs, jumping up in competition to see who can slap his burgeoning tits. They jeer at every yelp of pain, every cry for help, every plea for kindness. It's easy for them to overrun him, thrusting into him, sometimes more than one at a time, cheering whenever his belly pulsates and grows, betting each other money on where the next stretch marks will be, which goblin will make him cum, whether he's going to beg them to stop or to keep going. They make sure to brand his ass with the gang's symbol as their leader cums into him and his belly swells again. The other goblins tease him by rutting against his belly, abusing his stretched out angry looking belly button, pulling his head back and sticking their fingers in his mouth. Eventually they get tired and bored, going back to their hide-out to eat a big meal and take a long nap, leaving him covered in drying goblin cum, legs shaking from overstimulation and the weight of his womb as he tries to continue his journey, now even more desperate to get home so he can rest.
By the time he manages to painfully waddle home, his landlord, a dragon, is already there waiting for him, demanding the last three months of rent. They have no sympathy for the guy's sob story, or their painfully swollen womb riddled with angry looking stretch marks. They decide to take the payment another way, and since he's decided to let other creatures use his womb for free, it only makes sense that he should use his fertile womb to pay for his late rent. The dragon mercilessly pins him on his hands and knees, ignoring his cries of pain as his already overtaxed belly is crushed into the ground, and thrusts into him right there in his front yard. Uncaring for their tenants comfort or well-being they take their pleasure and deposit three eggs in his belly, one for each late month. With a roar that shakes nearby buildings they cum inside of him, ensuring their eggs will take. They growl a warning that in the future this is how late payments will be collected, and fly off, leaving him there crying from the pain of his belly swelling yet again.
Half crawling, half slowly waddling, with laborious slowness he finally makes it into his apartment. His roommate, both surprised and relieved that he's alive after three months missing, comforts him as he breaks down into full unintelligible snot-nosed sobs. They help him clean himself up, find something soft and loose he can squeeze into, wraps him up in a cozy blanket, and listens to his roommate's wild story of how he ended up arriving home so absurdly and supernaturally pregnant. He's so full every breath is a wheeze, every gust of air across his sensitive skin makes him wince, every piece of furniture creaks underneath his weight. Holding him on the couch, soothing him as he panics about if he's going to get bigger, when he's going to give birth, what he's going to do with all the litters and eggs and more when he does; a sturdy grounding hand rubbing circles on his heavy already over-taxed womb, his roommate notices the full moon rising outside. Looking from the moon outside, to the very moon-like belly dominating his frame, and back again, his roommate, the werewolf whose first litter is just beginning to move in his womb, decides he should be able to fit another litter of pups in there. At least.
