Best birthday ever.
About a year ago, my girlfriend took me to Las Vegas to celebrate my fiftieth birthday. We had been dating about a year at that point, and were experiencing the best sex of our lives. We have both realized we aren't going to live forever, and why should we deny ourselves the pleasure of an unrestricted sexual relationship. As a result, we have been very open with each other, sharing and fulfilling fantasies and desires. While we were there, we took in a couple of the topless/nude shows, and generally had an awesome time in our hotel room.
On Saturday night, after seeing a show, we retired to our room, put on a pay per view porn movie, undressed and settled back to watch. As the movie progressed, we both got very turned on, and began caressing ourselves and each other. I wound up fingering her pussy to orgasm while she watched the movie. When she recovered, she moved down between my legs to take care of me. I had been slowly stroking my cock, and I continued to do so as she licked my clean shaven balls and stroked my legs. I had masturbated in front of her before, and she loves watching my hand glide over my shaft.
She picked up the bottle of lube we had brought, and poured some over my cock. Revelling in the sensation, I continued to pump my rock hard cock while she ran her hands over my body and pinched and sucked my nipples, which we both love. She asked me if there was anything in particular I would like her to do, since it was my birthday. I hesitated, and she immediately knew I was going to ask for something new that we hadn't yet explored. Deciding what the hell, I told her I enjoyed having my ass penetrated, and would she mind trying it out. Smiling, she reached for the lube, poured some onto her fingers, and before I knew it she was lightly fingering my ass, and soon slid a finger up inside me and began finger fucking my very willing ass. My cock grew even harder, and she moved up a bit to suck my nipples too. I quickly reached my peak with all the stimulation I was receiving, and began shooting a load of hot cum onto my belly. Slowing down and letting go of my cock, I slumped back and she pulled her finger out, moved up and tenderly kissed me. Since then, we have had similar episodes. We both love all kinds of sex, and enjoy a varied, satisfying sex life, and consider ourselves very lucky to have found each other.