This happened in 1972 so I've probably forgotten some details.
I was about to graduate from college. For all I knew I would never see my buddy Charles again. I had met him our freshman year when he lived next door to me in the dorm. He still lived in the dorm. I was determined to try something with him so I dropped by his room. I steered the conversation to girls and sex since he was considered a ladies' man. I said I was horny and I hoped he wouldn't mind if I took care of myself on his top bunk. I climbed up and started jacking off. He asked if I had ever had another guy do it for me. I said since I was 12 I had been doing it all by myself. (I lied.) He stood on the bottom bed and put a pillow over my face. Even though I couldn't see him I knew he was running his nose up and down my 6' uncut hardon; I could feel his breath. He finished me off and I really enjoyed it. I'm sure he enjoyed it, too. I told him I should return the favor since it was such a good feeling. He dropped his pants and revealed a hardon about the size of two joints of my little finger, maybe 1'. There wasn't enough there to work with, especially since I was used to sliding a foreskin and he was circumcised. I just put my mouth on it and worked my tongue around until he filled my mouth with cum.
Well, I know he liked that because a week later he called me up and asked could we have another go-'round. Turned out neither of us moved away after graduation so we had three more years of hot sessions.