Nonhuman guys show up with feral bodies, claws, tails, horns, or full-on beast anatomy while still getting into explicit man-on-man sex. The art usually leans into power imbalance and raw fucking, with big teethy kisses, rough handling, and often exaggerated dicks or alien cock shapes. It can range from cuddly monster boyfriend vibes to straight-up predatory breeding scenes, depending on the artist.