I sucked her earlobe and kissed the back of her neck. Her moaning was increasing. She was continuously making sound like mm ahaaaahahhhh. I moved a li...tle bit lower and started pressing her boobs from over her top itself her moaning was getting louder and I feared that his husband might wake up. I removed her top and now she was in her black bra. Her bra was lacy type from which her pink nipples were clearly visible. I madly started sucking her nipples from over her bra. She was continuously. I couldn’t believe my eyes, there on Jenny’s bed my sister was spread eagle with Billy’s body between her legs. The sense of urgency in her voice surely wasn’t in her actions; her legs were wide, riding high on Billy’s thighs, so much so I could plainly see her cunt and Billy’s dick trying to punch into it. Now I’m no pervert but my sister has grown up a lot in the past year, her legs are tanned and long, on his elbows beneath him was a pair of tits that looked mighty tempting. Right in front. He had no reason to believe that his wife was being taken against her will. She loved sex, and he assumed that his nephew had her permission to take her ass.She would have told him so if not.Alan said he was just up to get something to drink. “Have fun, I am not a jealous guy. Betty needs more sex than I can ever give her,” Alan said. He was incredibly turned on that other men wanted his wife. They wanted what HE had. He could tell her not to do it if he wanted to but Alan had a very kinky side. “I’ve fucked up. God, I’m so sorry! Please don’t hate me!” “Cassie?” he asked quietly, but suddenly, there was a hard edge in his voice. “What, exactly, did you fuck up? Look at me!” I wiped the tears away. I was trembling. His gaze bore into mine, worried, questioning, full of that undeserved love, and it spilled out of me. How I’d had a few cocktails too many at the party. How I had suddenly found myself on the couch in the recreation room and snuggled up to Mark. How we had talked about work.