I enjoyed masturbating often, and on more than one occasion got caught. But that is another story. I was really turned on as she closed the door behin... her. I took off my clothes and looked into he full length mirror, admiring the length of my hard on. It really aroused me knowing that Margaret was close by, somewhere on the other side of the door. I turned the water on and stepped into the glass enclosed shower. It felt so good, as I hadn't had a shower in about a week, using our tub for quick. While she was gone, we got Jamie and walked over to our house. April called and told her mom where we were.I opened the door to find Mary outside sunbathing. Jamie walked up to the tinted patio glass door saying, “Is that your sister, Redd?”“Yeah, she’s 15 years old.”“She’s very pretty,” he said not taking his eyes off of her. I pulled him away from the sliding glass door.“If you want to be introduced, I can arrange that, Ok?”“Yes, please?”April pulled her step-brother away and sat him down on. As we started our senior year, we purchased senior class rings and gave them to each other We dated each other exclusively and our grades were looking good. Mary's mother stopped sewing her into her underwear after about six months, much to our relief. She could now have a soft drink on our dates and be able to go to the restroom. Best of all we started having a lot of oral sex. We felt that our blow-jobs and pussy eating would keep us from becoming parents too soon.She had become. I stared at her, while she took off her t shirt and small jean shorts. Now all she had on was a thong and a bra. I had scene her in her bra and panties before, but only as she walked to her room from the bathroom, never had I stared at her like this. She was tall and thin, with a very tight athletic body and a deep tan. "So you have scene boobs before" she said as she started to unhook her bra. As it fell off I saw her perky little A cup boobs. she rubbed her nipples and they got very hard..