Jacking off in White Briefs (Part One)

Well let's see, it started with a trip to my sister's boyfriends house, we were going to go swimming. I was about 12 when this started. I was really into changing with the guys, her boyfriend and his two brothers. I would always check out them in their white briefs, well not sure what the attraction was, I remained discreet about it.

I was getting out early and I headed back in to use the bathroom, the others stayed at the pool. I was alone in the apartment and when I went into the bathroom and shut the door, I noticed the hamper and saw a hint of a pair of briefs showing. I was really excited by this but was scared of getting caught. I looked out of the window and saw them all still in the pool.

I locked the bathroom door and started to pull out the briefs. I was hard as a rock and felt shaky when I held them up to me. I pulled off my own briefs and put them on. I was sooo excited by this that I started leaking some into the briefs. I pulled more from the hamper and then started to rub my hard cock through the material, they fit a little big on me but that made it even more exciting. I found a pair just like Marks,(my sister's boyfriend) I pulled them on with my cutoffs and bent over to see the band showing. I felt like I would be just like him. I unzipped my shorts to show the white material and a leaking hardon. I rubbed the front of them and started shaking as I heard the front door unlock. I started cumming in them and got scared so I zipped up with them on and put the rest of the briefs back into the hamper. I tried to play off how long I was in the bathroom but was afraid of a wet spot forming on my cutoffs. I pulled down my shirt to hide it.

This story has many follow-ups, one being what happened to the briefs I was wearing to begin with, that will come soon.