imagine an explicit story of NAME_1 somehow teleports by accident  to a dark macabre world she is unable to understand. She eagerly tries to resist world's dark indifference and perversity and find a way home. She becomes even more horrified when she realizes she starts to enjoy the terrifying situation she is in, the dark world beyond her mind, she notices she slowly turns into a latex creature. She tries to control transformation when she concentrates on enough, but it helps not for long as her physiological needs are disturbing her. Slowly tired NAME_2 surrenders and takes the world inside her, she starts to distinguish world's inhabitants. She transforming into a similar creature, that looks like a latex xenomorph with grotesque sexuality, she loses all her humanity and starts to enjoy becoming and being an object (as she is not sure anymore if she is living). She welcomes the creatures to mate with her, happy to lay eggs, watching her offspring grow and fuck her, eating them to lay more eggs. She loves being covered in semen and seed and her own love secretions lubricating her shiny skin, adoring it never drying out from her and washing in her juices and wastes, she eagerly rubs the wastes of creatures into her skin, even drinks and eats the wastes of creatures aroused by the strong odor.
Then imagine this creature in all her sexual detail. keep in mind it needs some human details in it's look to stay sexually alluring for reader even such shape is completely pointless. She might have multiple reproductive organs, even oh her head to mate with multiple partners simultaneously without stop but (again for reader's sake) those should resemble human genitalia and should be placed in places where human sex happens. For human it could look like a girl doing oral and anal sex in same time with vaginal sex. Of course her face has nothing human in it anymore as she may be impregnated through her mouth. And don't forget about her pregnancy. I guess she had her vulvas having teeth for her mature mates to be mortally injured after ejaculation and left to die. Do you think with amount of her offspring she had only two breasts? Also she may some need phallic nipples on top of her tits so sucking her for milk might look like sucking a penis.
Now imagine NAME_3 appeared in this world and found her. (pst. she didn't care about his personality, she forgot how to talk and hear, but she definitely wanted to catch and put that dick in his pants in her mouth ) How it happened?