I’m already nervous, yet also excited about bringing the fantasy of sharing my pussy with another woman to reality.”“Okay, ready to start?”She...exhaled deeply. “Ready! My pussy is already so fucking wet!” She uncrossed her legs and he quickly felt her moisture. He spread her excited juices over her mound giving her pussy a shiny glow. She then recrossed her slim, sexy legs.“Adjust the opening of your top so the nipples almost show.” She did so, letting him see her. “Fuck, you’re so beautiful!. "Nik, it's more relaxed than you think. I'm not sure how to put this..." What, you mean she's touched him or something? That happens, when children are growing up, especially brother and sister" Nikki looked at Lauren, waiting for a response. There was silence as Lauren concentrated on the empty road. "Oh no, is this going to be confession time?" I think so. Nik, I just can't think how it happened. It seemed right at the time..." What? She touched his cock?" Nikki paused looking at her closely.. “Don”t worry, we will!” Sis chuckled as she grabbed me by the hair and led me into the den and sat me down on the sofa! She sat on my lap and gave me a good hard slap on the face! “That”s for getting me all hot & bothered at dinner tonight in front of Mom you bad slave!” “But you started it” I protested!! Sis gave me stinging blow!! Then another even harder! “Don”t you contradict me!” “I”m your Mistress Sister! You”re my slave and will do what I say!”Sis got up and stood before me and pointed. I leaned over her with my belly against hers. She folded her legs up so I was in the V between her thighs, and she held my back. I began to thrust my penis up and down inside her, and I was surprised how naturally and easily the thrusting motion came. I came after just a minute or so, a much shorter time than when I masturbated. My orgasm wasn’t as good as sometimes when I masturbated, especially if I’d edged to the brink of a cum and held back before I wanked through to a spurt. But even that.