These events transpired years ago but I thought I would give back to this sub for all the inspiration (cough) you've provided me.
By the time this happened I had been lusting after my stepmom for years. We had and still have a close relationship.
The first time we had sex was when I finally managed to make a pass she couldn't ignore!!
About three weeks prior, my stepmom had burned her thigh with hot water. She had taken to hanging out in just her panties at night to give the burned area some relief.