When I was in grade 7 I started to masturbate. One Friday evening I had invited some friends to come over to my house while my parents were away at work. I thought I had at least an hour before anyway would arrive so I decided to masturbate to pass the time. I ran upstairs into my bedroom and turned on my computer and searched for something to turn me on. I ended up on this porn girl-on-girl shower vid. I took off my shirt and threw it on the bed because I didn't want to get any mess on it, then I pulled my pants and boxers down to my ankles and started masturbating. A few minutes later and I feel I'm almost finished but then I hear my bedroom door open behind me. I turn around and I see one of my friends (a girl). I freeze and she stares at me with my hands around my crotch, porn on my computer, and pretty much completely nude. I immediately jump up from my chair to close the door but I trip over my boxers around my ankles. I then get up onto my knees and am about to shut the door when I start cumming right in front of her. It shoots right to her socks. After I finish she walks away and I'm about to say something but I feel tired and lie down on the floor for awhile. Eventually I'm able to get up and re-dress. I walk downstairs and I see her just watching TV. I sit down beside her and it's really akward. We talk and I find out that my front door was open because I forgot to lock it after school so she came in. She then heard noises upstairs so she followed them.
Two years later and she now makes fun of me for it in a friendly kind of way, saying I had a small penis in grade 7.