The girls remained completely unconscious. I loved the view. My sister and Marla are both seniors, due to graduate next month. Me and Mike are in eigh...h. With any luck we’ll be freshmen next year. Neither one of us has done more than to just kiss a girl and maybe touch her boobies a little. I have seen my sis naked and nearly naked a couple of times for a couple of seconds but never anybody hanging it all out like Marla was right now. Holy shit! And I had a monster boner. I thought about how I. She was around 5’6″ tall but short than me.I m 5’11” tall.This event took place on a hot summer afternoon. I returned home after college at around 12.30 pm, took a bath, had food & was relaxing in the sofa in the front room.She normally used to return at around 2.00. Since i was alone,I got a little bit horny,so I started watching a porn video with the door locked on our VCD player.I got a hard bulge.Suddenly my sis entered the house.She normally used to carry a duplicate key & used to enter. I learned why during my first time with the girls. It turned out that both girls had very sensitive breasts and while they always had been sensitive, they'd become even more sensitive since our 'benefactors' had fixed our bodies. I learned that Fiona loved getting her tits sucked and teased and that she could even orgasm from just that kind of attention. Francine's were even more sensitive. I learned that my darling niece was into 'tit fucking'. She'd developed the skill back home when the. She stop it befor i came and said now put it in my pussy. As i was doing itshe said you cork is the biggest i have ever take in my pussy. She then took my cork and directed it in to her pussy. . I never fucked anybody before but my instints took over i started to move my hips forward and backward. I was now fucking my own aunt. I started with slow thrustand then i started to thump fast. After about 20 min i came in her. We both dried our self and came out. Next 3 days was very hot i was always.