i love any and all tentacle fic, but especially the dubcon kind, where the character is reluctantly into it (with or without Special Fluids). i also love: really big tentacles or many little ones (so stretching, basically), and tentacles fucking the character's mouth and manhandling them.

i can take or leave oviposition tbh, it's not what i'm after in tentacle fic, but it can definitely be hot.

and something i want but haven't read yet is this thing i read on imogenedisease's tumblr this morning: "tentacle porn gang!bang? As in, the way that the Sens come down after a game is for Sven to get fucked, while his tentacles do some fucking of their own." it sounds like a nightmare to write, but the visual is A+.