ERDM-176 - "Absolutely only once..." 4 hours of an inappropriate relationship with my wife's mother.

My wife is hospitalized, so my mother-in-law came up from the countryside to help with household chores. For a while, I will be living alone with my mother-in-law. It's been years since I've seen her because I'm busy with work... Wait? Was my mother-in-law always this sensual? I feel incredibly aroused and approach my mother-in-law, but (as expected) I am naturally rejected. However, we gradually become close, and with a one-time promise, I end up with my mother-in-law...