Many years ago I had a job teaching English in a college in Thailand. After class 1 day the mother of one of my lazier students came to see me and told me her daughter had to pass my class as it was important for her career. I told her that her daughter would not pass the class as she did not do nthe work and my assesment would be that she failed unless she really worked hard and had extra lessons for the month or so before the end of the year. The girls mom then asked me if I could give her private lessons in the evenings. I refused because I did not want to work evenings and was the amazed when she offered me sex in exchange for teaching her daughter.
I told her I would come to her house that evening and if she wanted me to teach her daughter she must make me that offer in front of her daughter, after a few minutes she agreed.
I went to her condo that evening and with her daughter sitting there this woman got onto her knees (a nice touch but not one I had insisted on) and offered me her body for sex in exchange for teaching her daughter. I looked at the daughter who had started crying and said OK, then I said first fuck before the first lesson. the mom agreed and started leading me into another room, her daughter tried to stop her but her mom told her she had to pass my class.
I had that poor mom in every position i could think of then after came out into the lounge and gave the daughter a 2 hour private lesson. This went on for a couple of weeks and the girl really worked hard and began to get better, eventualy I fucked her mom 1 last time and told them both that she would pass my class.
About 3 weeks after the end of school there was a knock on my door and it was the girls mom, she told me she wanted to fuck with me again, we now have regular sex at my place and I am even thinking that we might get together more permenantly.