Christina woke up and rubbed her eyes. She sat up in her bed and looked out the window. What time is it? She said to herself. She stood up and looked...at the clock. It was about 8 oclock. For a 17 year old Christina was over developed. She had a slender, tan body, no more than 110 lbs and 5 foot. Her breasts were large. She had a firm ass. She had long curly blond hair that was cut just above her waist. She wore pink booty shorts and a white spaghetti strap tank top. She walked down stairs and. She rolled over onto her belly and lifted her butt up into the air. He entered her from behind and started to pump. He was masterful, hit all her orgasmic spots, finally he made sperm deposit # 3. She pulled away from him and rolled over on her back, opened her legs, lifted her arms up towards him inviting him to enter her again, missionary position. Jamal entered, they both went wild in each other's arms, orgasm after orgasm for her, then he made sperm deposit # 4. As both lay there panting,. As soon as it was clear what I wanted, she moved with me and opened her arms and legs up to welcome me. I pulled my clothes off quickly, my cock knew where it wanted to go and I plunged into her, her pussy was hot and wet, as aroused as I've ever seen her. She shook as if I had impaled her, having an orgasm on my first stroke. I grabbed her shoulders and kept slamming into her. This wasn't the normal sex we had in our married life, this was brutal and raw and she welcomed it, arching her back. I drank some water, and with my eyes glued to the screen, I walked towards the bedroom.The door was closed, and I did not think too much of it then. It wasn’t locked. I shrugged to myself and opened it. That’s when I saw her… my own sister… on the bed in a very compromised position… with her…I closed my eyes, trying to block the images flashing in front of them. I did not want to see it. I wanted it to go away.I wished I had not seen it.“Has she lost her mind?! How could she do this!!” I asked.