When she started pushing back and matching my thrust, I began to pull further out until just the head was in. Her muscles gripped me as if they didn�...t want me to exit. As I pushed back in her velvety grip welcomed me back in. I was enjoying each and every second of this. It wasn’t long before I felt the churning in my balls. As my pace quickened, she must have sensed my need.“Yes, give it to me baby. Cum inside me, I need this,” that was all the encouragement I needed. I was pumping away like. .. nothing. Oh. The twenty were finished. Whew.A few moments of rest. Mistress was chatting with the guest. I just sucked on the plastic cock in my mouth.Mistress came over to me, placing a pillow on the table for my relief. I leaned down onto it. My titties still screaming at me though.I felt hands at my waist, and... my panties being grabbed. And lowered. Oh god, I was really exposed now. I did the little pantie dance as they fell off my legs entirely."Legs wider, whore." And I spread my legs. I looked down at her and she smiled at me and winked and then wrapped her lips around the head of my cock and started sucking it and I could feel her tongue swirl around my head again. “Oh my god Amanda, I have wanted you for the longest time. I want to fuck you so bad right now.” I told her. All she said was “You will, just not right now. I want to have some fun with you first” as she winked at me again and her head just engulfed my cock and slowly slide down my shaft.I felt the back of her. "You're not going to tell mum about him are you?" she asked biting her bottom lip."Sure I am," I laughed, "it's not like you are ever nice to me or anything." Please don't," she wailed, "I'll be nice from now on, I promise." So you're going to be nice to me just like you're nice to Danny?" I said."What! No, that's disgusting, you're my brother," she spat out."Ok, you'll choice," I swivelled back to carry on my homework."Wait," she cried, "I'm sure we can come to some agreement. Suppose I give.