The Village Bicycle
Kat was a nymphomaniac. She always had been. College had been some of the best years of her life - no one was off limits and she had done them all: girls, guys, teachers. She had calmed down a little after college and even gotten married to a man who was just as kinky as he was. They had had children and Kat considered those years to be her most calm. But now that there children were all teens, Kat was finding herself hornier and hornier lately.
Luckily, so was her Husband. He had found websites on bondage and they had started to experiment with it - Kat really seemed to enjoy it. The risk factor, the helplessness...everything. It turned her on. They even devoted a guest room to it and she would often found herself locked in it for hours on end. But her husband was about to push things even further, leaving the door open while people were over - his naked, aroused bound inside, helpless and ready for the taking, no matter by whom. [See picture for reference of position]
-Potential here for neighbors, coworkers, younger/older partners. Also incest, if partner is open to it.