I was at a party one night with my friend and we got drunk.

He is 5'7 and skinny and I wanted to know if his length was as big as mine.

I waited until he had passed out and then went into his pants.

To my surprise he had no underwear on. I started feeling his thingy and I got aroused. I then pulled his pants down and started jacking him off. Then I got a little tired and so I took his 5 and 12 inch thingy into my mouth and sucked as hard as I could and he pulled back. He started to wake up so I pulled his pants up and went to sleep. Is there someone that can tell me how to suck thingy properly to get him to cum in my mouth?