This happened to me a few weeks ago. A female friend of mine wanted to talk to me about her problems with her boyfriend but my roommate was home and I didn't want him to see us together as this would start rumours, so I just had her pick me up down the street. We drove around for a bit and soon were talking about sex. I asked her about masturbating and how often she did it, she replied about twice a week. I told her I tried to everyday but couldn't as I didn't get to be alone much. I kinda hinted that I have always wanted to be watched.
She thought that would be fun but we ran out of time that day. She called me the next day to ask if I really wanted to be watched jacking off and I said yes. She came over as my roomy was gone. We sat and chatted for a bit and then she told me I better get undressed so she could watch me have fun. So I did and her next surprise was my thong, wow she liked them. I went and got my lube and a towel wearing my thong, came back to the couch and pulled them off. I next sat next to her and lubed up, started to slowly stroke my cock as she just watched.
I was so hard sitting in front of her naked and jacking off. I wanted this to last as long as I could as I was really enjoying her there just watching. After about 15 minutes I started to breathe harder as she asked how good it felt and was I getting close. I said it was wonderful and I was real close, about then I told her I was going to cum so she sat up so she could see the whole show. I arched up and stroked hard and fast as I shot cum all over myself. She was shocked at the distance it went hitting me on the chest and belly. After I was done I sat there covered with cum and still milking out the last drop as I thanked her for watching me and how damn good it felt. We sat there for the next five minutes chatting as I wiped the cum off me and just sat there naked. We plan on doing this again in the next few weeks, I can't wait.