pillow topping

When a man thrusts his penis between a woman's large, soft butt-cheeks, eventually ejaculating on he back. Similar to titty-fucking, but with the butt-cheeks. No penetration, just a jack off with the cheeks.

I got up behind her and totally pillow topped that bitch. I was pillow topping her again and again, then blew my wad right up her back.