I reached forward and undid his zip and put my hand inside to feel his semi hard cock which made his smile even wider, I undid his belt and button and...his trousers started to fall down and I slid my hand into his boxers to get a proper feel of his cock.His fingers were teasing my pussy lips and clit and it was driving my crazy so I took the next step and grabbed the waistband of his boxers and pulled them down to reveal his cock to me for the first time. I looked down as my hand closed around. No, my sister sucking on my nipple felt not just good but great. Amazing. Confusing emotions ran through me as she kept nursing on me. Mom was in the garage with Clancy. She could come back at any moment.“Nancy!” I gasped. “Stop that. We're sisters.”She popped her mouth off my nipple and moaned. “And? You just fucked our brother. God, is his cum in your pussy? Please, please say it's in your pussy.”“What?” I gasped. “N-no. Clancy and I don't—”She fell to her knees before me and grabbed the. ..” She gave the fakest look of shock. “You’re dick is still hard. If you were a guy, you’d be soft right now.”“I guess you’re right,” I said. “Ooh, I’m aching. I need to fuck you again!”“Yes!” she gasped then rolled over onto her hands and knees, shaking that rump at me. Her pussy glistened, but I knew it wasn’t with her juices. “Fuck me! Pound my cunt so hard!”I moved into position, kneeling on my left leg while my right leg was thrust forward. It was almost like I was a knight kneeling. .. not to touch my pussy... you tell me "it's my pussy now, and I'll tell you when you can touch it."You pull your cock out of my mouth, looking at me. You're serious, and you say "tell me you understand." You pull my hair and my head back until I'm looking at you and I am forced to say "yes, I understand."now you push your cock deeper and deeper into my mouth, and i'm tasting your sweet and salty cum... a sweet dribble flows out, but you're holding back... you don't want to cum yet... you're.