We stayed like this for about 10 min with Bill reaming me and me grinding my ass in his face. Bill told me he was going to fuck me like he fucked Mari... and I told him he had better.I got on all 4's and Bill got behind me. I was already loosened up and his cock glided into my ass. He drove his cock all the way in and I winced and let out a little yelp as his cock was stretching my hole open. Squeeze it, he commanded.I tried to squeeze my ass but I could barely do it his cock felt so big.C’mon. She sits softly next to me. I can feel the warmth of her body on the bed beside me. I try not to smile, to play the role. But, I'm offering myself to her and I know she's excited. I feel giggly and elated inside, like a schoolgirl. Her warm hands begin to explore my back and my butt. She likes my young skin and I want her to enjoy it. She tries not to seem too eager, but she can't wait to pull my panties down a little and touch my butt cheeks. Her fingers play around the crack, eventually. We were kissing and sucking necks. We were feeling asses and chests and breasts. It felt so good to feel a cock filling my insides. I moved my hips to intensify the feeling in my entire vagina. Then, I needed to ride!I pushed on his chest until he was lying on his back. I straddled him and with imaginary belly dance music playing in my head, I began riding him. Oh goddamn I could feel the weight of his cock rubbing the walls of my entire vagina. I began to move my hips slowly and. I love my sister.Hi all readers , thanks for your response on my own story “My open minded sister-part -1”, I got lot of mails and compliments on that. That is not a sex story, it’s true incidents with small amendments in dialogs. Please mail your comments and feelings to id: “”.I will continue the remaining in this, as I told my sister and me are very close and live together in same room. After my sister mature(puberty) she refused to mom on moving to 3 bedroom flat, and she told that she will.