[Koko de Chikubi o Hitotsumami (Juurouta)] Incubus-kun to Mesu Kaihatsu Shokushukan [mysterymeat3]

A pretty incubus who grew out his hair and squeezed into shameful clothes gets far more than he bargained for when the tentacle horror Asty declares his inverted nipples, crotch tattoo, and 'poop hole' all need a thorough feminizing development. Bound limb by slime-slick limb, the horned tomgirl whimpers through relentless nipple-pulling and anal tentacle play, protesting that it feels nasty even as the creature demands words of gratitude for every degrading second. When the monster's many grinning faces close in chanting for him to cum, he's left sobbing, drooling, and still cumming, utterly remade into the tentacles' perfect plaything.