Wow, the story about the girl flashing her father brought back a lot of horny memories when I was a teen. I too was turned on by the thought of my dad seeing me naked, or at least topless in some way, and knowing he was looking. Although I thought about it at times when I was maybe 15/16 I never really thought serious about acting on it. I did masturbate at times thinking about it though.
One time over the summer, I think I was maybe 15 or so, I happened to get some weird rash on one of my butt cheeks that wouldn't go away. It was kind of red and itchy, and I let my mom take a look and she bought some cream at the drug store for it, and I started using it. I guess about a week went by and nothing really happened and the rash was driving me crazy. My mom wanted to take me to the doctor but I was so embarrassed I fought going and begged her to try and find another cream for me or something. Anyway, my dad was a physician assistant in an emergency room and so he had a lot of experience with medical stuff. My mom finally said well, if you don't want to go to a doctor do you want to let you dad take a look and see if he can prescribe something that will work. Omg, I couldn't believe it. Here was my chance to sort of live out my fantasy in a weird sort of way. I was too nervous to say yes at first and just told my mom I'd think about it. And yea, I sure thought about it. I couldn't stop thinking about what it would be like to let my dad see my butt, and with my mom there of course too. After a few days I decided I would do it and told my mom it was ok, that I'd let dad look.
All day long I thought about what I was going to do and how I would show my butt cheek to my dad. I didn't really have to show him my entire butt to see the rash, but I couldn't stop thinking about giving it a try and just pulling down my pants totally and letting him see my entire bum. Until it happened I didn't know what I was going to do. When he came home from work later that night they came to my room and knocked on the door. I was in my pyjamas watching TV in my room and so nervous, knowing that my dad would be home soon and thinking about what I was going to do.
So they came in and my dad said 'you know we could just take you to the doctor and get this looked at, you don't have to show me'. I decided to just go for it and I told them I was ok with it and just wanted to get this dealt with. So my dad sat in my computer chair and my mom was there, and I just turned around and pulled my pyjama bottoms down completely off my butt, letting my dad see it totally. They both said honey you don't have to stand there naked we just need to see the rash.
So I pulled 'em back up just a bit but basically my entire butt was exposed, as was my front although they couldn't see that as I held my hand over my crotch to cover that. Basically my dad knew what it was right away and so I pulled up my pyjamas and my dad said he'd bring something home from the hospital tomorrow that would deal with it.
I can tell you though, after they left my room I gave myself three of the best orgasms that night that I've ever had. I was so turned on thinking about my dad seeing my bare bum and what he must be thinking. I couldn't believe I did it, but it turned out to be such a turn on. I look back on it now and laugh, but at the time it was very erotic for me. I never talked about it with my friends of course, but I've often wondered if many other girls had fantasies about exposing themselves.