Desperate Sister

I'm 27 doing quite well career wise and somewhat lacking in relationships. But there are always hookers for males like me. My only sister 31 the oldest of the three of us, is married to a jerk as far as I'm concerned. He's a penny pincher, wants to know where every cent goes, she can't give any money to charity as he would hit the roof. He has some questionable activities I think and gives my sister cash to buy the groceries, sometimes not all the time. To get rid of the cash without the IRS knowing I think, they needed a new washer/dryer, and he gave her cash to pay for it. Anyway, she lost the cash and was really desperate, I was the only one she could turn to. But she had another problem how to pay me back without her husband knowing. She knows all about my lack of relationship and was so desperate she offered me herself as payment for replacing the lost money. I was at first shocked but thought it a great deal and we started fucking regularly. Turns out her husband was also lacking in the bedroom, always too busy with some deal or another. Too much of a penny pincher to have an affair of his own, so in a way I was solving two problems for my sister. Satisfying her sexually as well as replacing the lost money. After the agreed number of fucks, I was disappointed that they would be stopping. But as I was doing such a job satisfying my sister she wanted to continue. One more thing, she was doing her spring cleaning and found the lost money, it had fallen down the back of the sideboard. She even offered to pay me back, but I told her to keep it for future use. I really enjoy fucking my sister and she likes me fucking her as well.