Kelly moaned, and squirmed with instant gratification. "Oh my God that feels so good!" she screeched. I took her other foot and gave it the same sti...mulating treatment. As Kelly squirmed, and moaned all I could think about was how I would make her moan for different reasons!I was about to do something really taboo, cheat on my girlfriend with her own sister. It's almost i****t, I thought. Since Kelly is Jenna's younger sister and, I have known her for as long as I've known Jenna. At times. This was going to hurt.Crack! My hands clutched the bedspread as the wide leather sole whipped across my backside.Crack! 'Aaaah!' Half cry, half moan of pleasure. I was aware of nothing now but the heat, and the pain, and the pressure that was building inside me, deep in my loins.Crack! The hardest yet, full across both cheeks, made me arch my back, hips pressing against the edge of the mattress. I gulped in a lungful of air, held on to the bedspread to stop myself leaping to my feet.Crack!. I stopped in the middle of the aisle.She walked towards me with her glasses hangin on the tip of her nose. I was fantisizing about fucking her, staring right at her chest. She smiled and said, "how are you young man". I replied "doing great! thanks for asking".My heart was racing, I was thinking of what I could say to her to strike a conversation, when she asked me "can you help me get some dogfood, those bags are too heavy". I said "sure!" I then asked her what kind of dog she had, bla,. Then the most awaited dinner time came.We went to a nice pub with soothing music and ambiance. As usual I made fun of her and relaxed the mood a bit. Some items in cocktail menu like “Sex on the beach” was the talk of the day for us;) And we talked quite a lot about practically everything under sun. Hours passed and two to three cocktails and some shots of vodka went in… we both got a bit pumped up. Started talking more freely. We ordered a bartenders choice of cocktail( Can’t recollect the.