The guy who has a deformity or several.

One guy had several bumps on the back of his head—real goose eggs—but without any hair. He was modest about them, as one would be, and he wouldn’t let me touch them until we had met a few times. I rubbed my dick on them and I don’t think he could feel it, but the thought of it drove him wild. I moaned “Quasimodo!” when he thrusted.