We had some argument going on with my younger step-sis and mom come to calm us down. As always she suggested we should behave, and play some stupid games etc instead of fighting. Just to please her, we started to play some domino but I already had a different kind of game in my mind. I moved behind my stepsister who was still sorting out those domino blocks on the kitchen table. I put my hands around her and started to fondle her sexy body. She tried to resist a bit first because my mom was just near us. Then I started to rub her tiny pussy and resistance instantly ended. She was moaning quietly and was so ready to get fucked by my massive cock but mom was still just few step away us and she could caught us in any second. Then it happened. Mom left the room and went to the kitchen. My step-sis knelt in front of me and started to suck my cock like crazy. I could barely hold my voice down. She was so good. After few mins of good sucking I slammed her against the kitchen table and started to fuck her from behind.