Dizzily delirious with incestuous depravity, her son watching her strip naked was a speeding freight train on a collision course doomed for disaster b...t she didn’t care. Obviously, he wanted her as much as she wanted him. Unable to move and unable to respond, imagining him watching her while masturbating over the sexy, naked sight of her, she stood there silently stunned that her son had invaded her privacy by watching her strip naked. With a million sexually wicked thoughts flashing through. Both of our houses were two-story tall homes and their bedroom windows faced my bedroom windows. There was a small single story home in-between our two homes. Sometimes at night I would turn off my lights and watch the twins get ready for bed, but I never saw anything much.One time during the day I was really horny and my cock was aching for release. It was so stiff it hurt to be confined by my jeans, so I took off my pants, underwear and t-shirt. Then I started stroking my pulsing cock, it. Our bedrooms were on the third floor and our parents were on the second. We had our own bathroom and small living room. Her bedroom was on the other end of the house than mine. I could see the moonlight flowing through her door since it was slightly open. I peeked through the crack making sure she was all right. My mouth dropped. I couldn’t believe what I was seeing. Now don’t get me wrong. I’m 19 years old and my sisters 18. We both know that neither of us are virgins. But witnessing my. We both moan a bit and I begin to fuck him feverishly. I'm lifting my ass up enuf and sliding back down again, being careful not to let his dick come out. I ride just is head a few times, then twist around, so my tits are flopping in his view. he pulls me forward and sucks my tits.We are fucking like a bunch of rabbits fucking. He's pumping my pussy hard and making me cum alot. I have him pull out, I go down for a lick session on his dick. He then pushes me over and has me get doggie.