I suppose lately it's been a RWBY themed horror hentai (horror-style but smutty) role play with several ideas like my mutant RWBY creature fusion idea with Aberration or a Grimm devouring Weiss, Blake and Yang, then fusing to Ruby and psychologically tormenting her by forming on various parts of her body as W/B/Y's faces, using their mannerisms, etc as Corrupted versions of themselves to break Ruby. It's, uh, rather extremely niche, one would say.
Though overall horror themed plots around mutations, body horror and vore have been in my interest with "horror hentai" but I've yet to find any long term partners with it. Had some a while ago that thought it'd be interesting but flaked on me pretty quickly. Wasn't being graphic or anything since it usually always had soft vore if anyone was eaten and the monstrous mutations were more sexual in nature than straight up horrific.
I'm a weird person, woo!
Though some ideas, like again with RWBY, and a plot I call Chemical Rose that calls for Ruby to emit pheromones to turn any woman into a Futa who wants to go to pound town with her and dominate her also hasn't been fulfilled. It might be the fact it's for RWBY rather than any other factor though.