This character performs a tentacle rape, use Non-consensual Sex with Tentacles on the character being raped. Tails, roots, appendages and whatnot are also covered by this trait.

Tentacle rape or shokushu goukan is a concept found in some horror hentai titles, where various tentacled creatures (usually fictional monsters) rape or otherwise penetrate women, anthropomorphous creatures, futanari and, less commonly, men.