I watched in amazement as her dress slowly started riding up and his hands seemed to wander way past her normal comfort zone. Eventually his hand disa...peared up her dress and a look of extacy appeared on my wife's face. I couldn't believe it. My significant other of 10 years was getting fingered on the dance floor only a few feet away from me!She was so caught up in the moment that she totally forgot I was still there watching her every move from a short distance. When she finally looked my way. Better yet, it was a girl who’s very life was now to serve his pleasures. He could have sex with her when ever he wanted and could give her as much pain as he wanted and she could do nothing. He had power over her life. The thought multiplied the pleasure he already was feeling. With that in mind he stepped up the pace. He pulled half way out to thrust again. Alice closed her eyes and let out a sign of relief. She was sure it was over. But suddenly to her surprise the man quickly thrust. I obey and get on my hands and knees, with my ass in the air. I feel his hands rubbing over my ass, then Smack!“Ow!”Smack!“Ow! Babe!” I yell over my shoulder but love his hand spanking my ass. He knows I love his surprise spankings. I see a pink very large handprint on my otherwise white ass.Smack! Smack! Smack!I wiggle my ass back and forth wanting more.“Oh, no you don’t. You will not distract me from the task at hand.”He reaches one hand over and spreads one ass cheek out why the other hand. The fact that one was my adopted sister and the other one was my blood sister didn’t make any difference. I knew it was a sin to fuck around with my sisters but I figured it was only half a sin because one of them was adopted at age nine from the Catholic orphanage up in Westchester and the other one was only half a sister because she had a different father with my dad having been picked off by a Jap sniper on some fucking Island that nobody gave a fuck about other than it had an operating.