My girlfriend called to let me know that she wasn't going to make it to my parent's place for dinner tonight. She always does this, and I'm honestly over it. So when sis comes in to bring me a full plate of food, I couldn't be any happier! But my sister was being extra touchy with me tonight. She rubbed her hand up and down my thigh, and I even saw her bite her lip when she looked at my crotch. I could tell sis wanted me, and I was ready to give it to her. Watch sis take my long thick cock down her throat before she rides me. I bend her over and pound her tight pussy while our parents are in the other room! Right, when I was about to cum, I heard mom knock on the door and we rushed to get our clothes back on so she wouldn't catch us!!