As she began to rock her hips slowly back and forth I reached up and grabbed the straps on each shoulder and pulled them down, freeing her big tits. I took them in my hands and guided one of her big nipples right to my mouth. I sucked and nibbled on it and switched to the other one as she continued to rock back and forth on my cock. After a few more minutes of this it was as though she had just changed gears. She was no longer rocking back and forth, she was now pumping up and down on her knees riding my cock while those big tits bounced around.
Amber looked at me and asked me if I was getting ready to cum and I laughed. She asked why I laughed and I told her that all the beer and combined with me being fifteen years older that I didn't cum as quickly from fucking as I did from blowjobs. She got a big smile on her face and to my amazement she climbed right off. I asked her what was wrong and she said nothing. She go right next to me, put her knees on the couch, leaned forward and told me she wanted me to fuck her from behind.
Without even responding I stood up, dropped my shorts to the floor and slid my dick right back in her pussy. She immediately let out a loud gasp. We stopped for a second to make sure no one was moving around upstairs. Once I felt sure no one was up I started pumping my cock in her pussy again. I slid the night shirt up over her ass and grabbed her hips. It was then that I decided I was going to fuck her hard and see how she liked it. I pulled one hand from her hips, slapped her ass so hard I heard it over the TV and then grabbed her hip again and pumped her so hard she was giving out small grunts with each thrust. About five minutes into this she said she was going to cum and buried her face in the couch cushion and continued to grunt. This happened two more times as we continued to fuck.
We went on like this for about twenty minutes when she told me she wanted to ride my cock again. As I pulled out I gave her ass another good slap and she turned to me and smiled and asked what was she going to tell Mark if he saw a big hand print on her ass in the morning. I just laughed and told her she would think of something. I sat down and she once again straddled me and slid right down on my cock. There was no rocking back and forth this time, she went right to bouncing up and down on my dick. This time I had both of her nipples between my fingers and I was pinching and twisting them. Her bouncing up and down added to my pressure on her nipples. She very soon told me she was about to cum again and she leaned forward and kissed me to mask the noise she made while cumming.
At this point I wasn't sure how much longer I was going to last. With my mouth close to her ear I asked her where she wanted me to cum. She looked at me and said that if she didn't have to go and get into bed with Mark she would want me to cum inside her but that she would swallow it tonight and to let her know when I was close.
We kept going for a few more minutes and I told her I was going to cum. She slid off my cock, right down to her knees and took my cock in her mouth. I told her I was going to cum and she kept sucking as I pumped six big loads of cum down her throat. After she licked my cock clean she climbed back up on the couch next to and laid her head on my shoulder with her big tits still out.
After about ten minutes we realized we were both exhausted and decided sleep was a good idea. We climbed the stairs and she kissed me before she went into the guest room and I headed for the bathroom to clean up before going to bed.