a deal with a devil, a Faustian bargain, a metaphorical death, an existence purely for sex, assuming another identity, bigger than should be possible, demon lesbians, embarrassed by the changes, goes to extremes, going along with the weird, he becomes a woman, her breasts go past her knees, I'm gonna die anyway so might as well, monster girls have more fun, monster physiology can be surprising, more than they bargained for, outgrowing one's clothes, succubus means I'm a bottom, they get a new lease on life, unsure to accepting, utterly transformed, way more than you bargained for