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Eddie doesn't quite die in the upside down. Once he's alone, the vines wrap around him and hold him together, a thin one finding his mouth and squirming down his throat to feed him nutrients. Pulling him into the woods where they lay him on a writhing mass. Once he's healed, they wrap around his thighs, lifting them towards his chest, leaving him vulnerable in his shredded clothing. He wakes eventually, conscious but trapped within his body. He can't move, can't speak.
Then the creatures start to come, knowing his body is ready for them. It's the dogs at first, snuffling around him and chewing at the scraps of fabric that cling to his body. He's terrified and his body won't listen when he tries to move. He can't even open his eyes so he never knows where they are. His clothes are eventually torn completely from his body, leaving his naked and cold at the mercy of these monsters. The dogs brush along him, bringing goosebumps to his skin. Then one mounts him, it's tentacle-like dick sliding around, trying to find entry. It takes a few tries before it sinks into him, wriggling around inside his cunt as it thrusts until it's base swells and sticks, filling him with cold wetness. He wishes he could cry. They travel in packs, and they mate in packs too. The next one mounts him, it's cock sliding through the cum dripping from him. It's cock catches and pushes in, but instead of his pussy it forces itself into his ass. He would scream if he could, at the pain and anguish.
They each take turns, most of them filling his pussy but the occasional one slipping into his ass, filling both holes with their cold cum.
Time passes and he's left alone for a while. Then he feels the vines tighten around him, holding him more firmly in place. Large claws hands trail along his torso, just barely breaking the skin, before something large pokes at him. It's bigger than the dogs, a pointed bulb at the tip. It breaches him and if not for it's slime coat he's sure it would tear him open with how dry he is. It wriggles in until it hits his cervix, pointed tip pressing insistently against him. If only he could scream, sob at the pain as it catches on the tiny opening within him. It pushes through, stretching him where he shouldn't be stretched. He feels sick from the burning pain, but he can't even throw up as he is. Eventually it pops through into his womb, and then the horror worsens as the bulb opens. It hooks into the walls of his womb, holding his cervix open as coldness dribbles into him. He feels it swell at the base against his folds, pushing into him just like the dogs, and he's relieved that it will soon be over. But it's not. The swelling travels through him, all the way to his cervix where it pushes something into him. It feels huge, but he knows it must not be since his body can only stretch so much. And then another enters him. The marble size objects are forced into his womb continuously, leaving him full and sick to his stomach. After about a dozen, the demogorgon pulls out, and his cervix reflexively tightens back up without the petalled head of the demogorgon's cock to hold it open.
Inside he's screaming, his mind so loud it's almost blank.
More time passes, until eventually he feels a strange sensation. Movement. Coming from within him. It dawns on him with horror that the eggs, because that must be what they are, are hatching inside him. He wants to thrash, he wants to bite down on the thin vine down his throat, but he can't.
Eventually the writhing feeling within him peaks and he feels pressure against his cervix, shis time from within. A thin, slug like creature, from the feel of it, wriggles through his now dilated cervix and plops right out of his pussy. One by one they slide out of him until he's empty for the first time in so, so long. The relief he feels is short lived though, as not long after he feels another demogorgon force it's way in.
The cycle continues, and eventually his mind grows numb to the horrors. Demodogs, which he determines are not sexually developed enough to reproduce, come by in packs. The worst is when one catches on his urethra, forcing it's way into his bladder. The knot doesn't fit, but presses painfully against his pussy as it fills his bladder in a way it shouldn't be filled.
The demogorgons are solitary, only coming one by one, but not always waiting until the slugs have crawled out of him. Eventually he finds he can take about three broods before it's too much for his body without the needed hormones. A pattern builds until he's never empty, always having at least one brood filling his womb at all times.
The weirdest is when the bats come. They don't seem to need him, but come to him out of curiosity more than anything. They fill him all at once, their multiple tentacles sliding into all three holes. They're much thinner than the dogs at least, not hurting as much when they make themselves at home inside his bladder. He doesn't think they even cum, just wriggle around enough for him to - and maybe that's their purpose. Maybe that's his reward for incubating the upside down's young.
He doesn't know, and he doesn't think he cares. He doesn't think at all. He simply exists, carrying brood after brood for these monsters, for this world that keeps him alive just for this.