I have a sister that is almost 3 years younger than I. We have always been a very open family, thats is for example thinking nothing of seeing each other in our bras and panties and stuff. So one holiday weekend when we were both home from college I told her I was bi. I have been bi for 5 years at that point and just felt I could tell her now. She was excited because she said she was thinking she was too. We shared a lot of feelings and experiences and I told her about a girl in college that use to love taking pictures of me. My sister has always bee a bit of a photography nut, so she asked if she could take some of me. Ya know, like Victoria Secret type of sexy pics so I said sure. I have to admit I like being a bit of a voyuer, so the entire idea sounded like fun. We started taking photos and she encouaged me to pose more and more and look sexy. I told her I was going to use this photos for my gf. That encouraged her to have me pose more sexy. Well.. one thing lead to another and before you know it she had me taking my bra off and showing my boobs and ... well you get the idea. So before long my "little" sister saw me nude. That was the first time she did, but since then she has me a few more times and I her. What fun!!!