Then for a brief moment she let me suck one nipple and then offered me the other. I grabbed my chance and sucked them….she moaned out ….this was c...azy…..now slowly she moved down my body, with her boobs and nipples she touched my chest, her nipples on mine, stomach, stayed at the navel for some time……her hair medium cut, to shoulder length, dropped on my stomach, tickled me, I went mad….I tried to grab her, she held my hands beside my body tight….her boobs now touched my erect penis…..which was. I was going out with Kim for the evening and forgot my wallet. I returned home to get it and as I went down the hall to my room I had to pass Tracy's room. I heard some familiar noises of sexual pleasure she was making so I figured that I had caught her using her dildo so I decided to surprise her and rag on her.Her door was open part way so I just gave it a little push until I had a view of her bed. I found her on her back in bed naked but she was not alone. Her boyfriend was giving her a good. They had tied my hands together with my bra. He says I must kiss his cock and make it better. I flicked my tongue against the head of his penis tasting it as I did so. MMM yummy. I realized that it wouldn't be such a hardship and if I pleased him, he might let me go. So I started licking, nibbling and sucking on his balls, shaft and head. Taking him all the way into my throat and then slowly pulling back until just the head was left in my mouth. He then grabbed the back of my head and. Shamefully, that did not concern me at all.What bothered me was that my step-sister was beginning to get used to the idea of sitting on my face with her wet and wonderful snatch or with her erotically scented poop chute. She constantly begged me to get it “deeper” or to get it “faster” like she was a traffic cop directing either my cock or my tongue to do it right.I must confess that I was serenely content with either of those choices by my beloved step-sister Susan because her snatch was prime.