"School is cool mom but I can't wait to get out of here and go into college," Britney smiled.My sister Britney was mom's second eldest child and while...I was considered 'boring', Britney had a boyfriend and actually fucked some other guys in high school. Friends of mine told me that my sister was a slut and that I was lucky to have a sister whom they all wanted to fuck.She also happened to look like that singer who sang that song "Nothing Sweet about me."It was true. She was a slut who fucked. They already got along well with Christi and were getting used to her often being there in the morning, so having a “mom” in the house was just fine. Actually it would lighten their housekeeping chores.As we settled into the new domestic arrangement Christi was the model of discretion about her outside sex life. She would call me on the occasions when she was going to be absent for dinner or the night. When this happened I would find myself in bed that night stroking my hard cock thinking about. The four of them made love all night long, trading off partners. Every so often one would take a break and it would just be a threesome; one riding the other's face and the other licking any available pussy.The four of them finally awoke the next morning. Ashley said to Sandra and Samantha, “Oh God. I hope we can do this again.”Sandra chirped, “How about tonight?”This went on for the next couple of nights the four of them together. Enjoying each other's bodies and the great sex.Sandra's phone. At the time, all I could do was try and ease the pain as he shoved the first finger in slowly, deliberately. I felt the tip of his finger enter first, slowly penetrating me to the first joint, then the second. Once he bottomed out he began pulling it back out slowly. Again and again and again he did this, so slowly it was almost a tease. I could feel my precum oozing out of my penis as he continued loosening me up for his pleasure.“You are much looser than I would have thought” he said “I think.