Size is almost irrelevant to me, I said almost irrelevant. I really get off on very hard cocks, uncut preferably. But a big load of cum is more to my liking than a huge cock. Now, with that being said, if a cock is 9 or 10 inches and very hard, uncut with a big load......I'm gonna be VERY happy. If it's 5 or 6 inches very hard, uncut with a big load.....I'm gonna be pretty darn happy.
Back in my 20's, I had a regular suck buddy that I would blow at least twice a week for about three years. Good looking young, uncut Latino. His cock smelled and tasted yummy. Maybe about five to six inches, rigid hard. I like to think of myself as a great cock sucker. Usually took him about 5 minutes to blow his load. He had a load of cum that would fill up a stomach in no time. Big powerful spurts and his cum was thick and bright white, I could never hold the whole load in my mouth...so I usually swallowed once I started feeling my mouth up with his juice and seed.