My Sister

When I was twelve it was summer and we had been coming in and out of our pool. My sister Ellie was pretty and at age 16 she had a body that started to bloom fill out or very curvy. She had very nice tits and a tiny waist but her ass was something every female wishes she had. Of course she was my sister so I paid more attention to her friends on their sexy little tiny bikinis. It didn’t matter the boys were always after her. One day my mother’s boyfriend who had been staying with us caught my sister and some guy fooling around and it really bothered Ronnie. He made everyone leave and I saw him take her by the hand and lead her to bedroom where he was confronting her. Little did he know was we shared bathrooms and I could see from a small window like structure that was covered but still a little access. She was sitting on the bed him standing over her and he ask her if she’s already been having sex? She says a little bit and she questioned why he should know? He says I know what you want and (making her stand up he bends her around.) unzipping his pants he pulls down her bikini and aims his long dick to her ass area. I’m comparing his size to mine and I’m like a forefinger long thumb thick compared to his he was extremely huge. He just aims pushed her head on the mattress he just starts pumping slowly and she grunts as he’s slowly pumping in and out saying that feels good doesn’t it Ellie ? Is this how they make you feel? He’s about eight maybe nine inches long and even thick she moaning so hard he ask her do you want me to stop Elsie? She says fuck no fuck me … my pussy feels so good and he hears that and starts going in very deep and suddenly she’s screaming she has to pee and he says that you don’t have to pee. Your tight pussy wants to cum go ahead and do it. Sure enough she begging him not to stop please fuck me don’t stop she’s screaming she’s cumming and he just continues to fuck her hard and he continued to fuck her hard and she tells him he’s so much better than any guy. She says your big dick is going to make me cum again. He reminds her not to tell our mom or she won’t get his big dick anymore she says she definitely promises she won’t say anything she says she has to have his big dick again and he pulls out and without touching his dick it’s aimed at her face and he shoots off huge ropes of cum onto her face. She trying to overcome her climax eyes closed and just allows him to shoot all over her face. He shakes his dick and says remember not to ever say anything about this. Even as his dick is soft it still looks huge dangling down his legs. She just layed there dumbfounded and he ask her is this really what you wanted or that little boy ? She says now all I want is your big dick. He closes the door and leaves. She just lays there touching her belly and trying to clean her face. I can’t believe what just happened and I witnessed. Throughout the summer she would try and get me to leave as they both were there to have sex. They knew when our mom would be gone . You could hear her moaning all the way down stairs. I just always pretend I had no idea what I witnessed or heard. It would have been very creepy to tell her I know .