There's an old house at the end of your street that's been abandoned for years. You were dared to spend the night in it and you'll be damned to let them call you a pussy. You head over as dusk starts to fall and approach its massive oak doors with a flutter in your heart, silently repeating to yourself that's it's just an old house, nothing weird about it at all. You try the doors, but they're locked so you go round the back and find a broken window that you climb through. Dust swirls in the last rays of dying light as you poke about in the gloomy interior, trying to find a comfortable enough spot to spend the night. You muster the courage and take a peek in the basement where to your surprise you find, judging by the decor and the large amount of stuffed animals around the walls, what seems to be a little girl's room. Despite its run-down condition it seems pretty cozy and the bed here looks like it's in better shape than the one in the master bedroom. So you shrug to yourself and settle in for the night. At first you're certain you won't be able to get even a wink of sleep with the house creaking and making all those strange noises, but as the night grows long you start to nod off and eventually lose consciousness.
A soft cough in the night and you bolt awake, heart racing, mentally disoriented as you frantically try to get a grasp on your surroundings. Your panicked gaze stops on a girl at the foot of the bed, her black hair in a pair of long braids framing a pale, dead serious face. "That's my bed" she says matter-of-factly. You try to come up with a reply, but your brain feels like mush and the most you can manage is a sputter of gibberish. "I suppose I could let you stay, but I'll want something in return." She clambers onto the bed, kneeling by your feet. "You like my teddies? I could always do with a new one." She gestures with a hand and draws your gaze to the walls lined with shelves upon shelves of stuffed animals, their glassy eyes now seemingly all staring eerily at you. Your rattled brain finally manages to string some words together and you turn back to her to object, but without having felt her move she's suddenly right above you and jams a hand over your mouth. "Ah-ah-ah, toys don't talk. I think you'll make a fine addition to my collection, but to be one of my fluffy pets you'll first need some stuffing." She takes hold of the hem of her skirt with her free hand, pulls it up and from underneath you can see spilling onto your chest a wriggling mass of tentacles that quickly start slithering along your body. A few of them grab hold of you, their cool slimy grasp fixing you in place, while others slither down your pants and around your neck then further up, poking and probing for any and all openings.
With all your holes stretched and plugged firmly shut she snuggles up to your immobilized body and whispers in your ear "The process usually takes a few hours, but don't worry you won't feel much different apart from the obvious not being able to move bit. Now, if you're ready..." She frowns in concentration and you feel a burst of warm liquid start to seep out of the tentacles lodged inside you, slowly filling you more and more and more, until you're filled to the brim, feeling like you're going to burst. The strange girl shifts and snuggles more comfortably into you, your bulging stomach sloshing slightly with the movement as she cuddles you like a teddy bear and whispers a final "Good night teddy, you should be done by the morning" before her soft breathing slowly grows more shallow and she drifts off to sleep, still wrapped around you as your body begins to gradually and almost imperceptibly shrink in size.