I have known my brother-in-law Billy for eight years. He’s my husband’s brother, and we first met when I was three months pregnant with my oldest child. When he first laid eyes on me, I saw his cock get hard. All the while his wife was sitting next to him on my mom's sofa. I blushed, and he took that for interest. I didn’t know then that we’d met all over again on Adult Friend Finder, seven years later. Time passed and he and his wife moved back to our town. We saw each other more often, mostly at family functions, or when he’d come over for a beer with Dan, my husband, his brother. Billy made a point of coming by all the time to see his brother and “hang out.” On one of those drop-by's Dan wasn’t home. Dan’s a cop, and though he usually worked day shift he was covering for a friend that night. He wouldn’t be home until 6:00 am. I had just had a bath and was preparing for an evening of surfing the net and having online sex on Adult Friend Finder, my favorite pastime. I grabbed my bathrobe and walked to the door. When I saw it was Billy I opened the door and told him Dan wasn't home. “Actually, I’m here to see you,” Billy said. So I let him in and asked what was up. “I’ve seen you on Adult Friend Finder; I know you don’t cheat, that you don’t fuck those guys. But I want to fuck you. I promise I’ll never tell. I’ve wanted to fuck you for a long, long time. I was shocked at first, but then I was instantly wet. He saw that look in my eye and kissed me hard. I kissed him hard back. Billy took that as permission and let his hands have free reign of my body. He squeezed my ass, squeezed my tits and pinched my nipples. He slid his hand down my stomach and into my panties. He started rubbed my clit up and down and slid two, then three, then four fingers into my pussy. My knees felt weak and I came in his hand. Billy was better than I would have given him credit for. He rubbed my clit and spread the pussy juice around. We went into the kitchen and he bent me over a chair and pulled my robe off. Then he got down on the floor and spread my legs apart and started tonguing my asshole and my pussy. I was glad that Billy had seen me on Adult Friend Finder; fucking him didn’t feel like cheating; after all, he was family!