Step-bro and Me

I am 17, and while I was in my room sitting at my make shift desk reading this site and masturbating, my 13 yr old step-bro comes in.

He gave me a big grin, closed the door and straddled my lap facing me. He couldn't get any closer. I continued to masturbate, when he took my hand away and started to masturbate me until he jacked me off. Fortunately I had some paper towels nearby to sop up my cum.

I felt his cock and balls and masturbated him, and he got dry orgasms which almost knocked him out.

For a guy 13 he has a 5 inch cock, just 2 inches less than mine. It felt so good, we jacked off each other again. Now it's a daily deal with us.