Anyone that I've developed a good connection with is always fun. And anytime I can get my hands on some muscled beast is a blast. But the guys that do it for me the most, the ones that have me fantasizing about it for days afterwords, are the anon hookups where he doesn't even view me as a person, but just sees me as a masturbation sleeve to bust a quick nut in.
I still jerk off to a hookup where I was ass up. He came in, held me down, pounded vigorously for a few minutes and then blew the fattest load inside. Never addressed me, just came in, straight to business then out the door. He needed to get off and I was just an object to facilitate that.