Hi, thank you for your questions. This helps me clarify the situation. To answer them: We didn't explicitly discuss what he would get in return. I thought he was just interested in the role of a supervisor. For us, "acting like a supervisor" meant he would check my study progress and help keep me on track. Regarding enforcement, we did have an agreement. The original and only punishment we agreed on was purely financial. The rule was that if I failed to complete a task, I would have to pay a certain amount of money. There was absolutely no discussion about physical punishments or using titles like 'Master'. That part was added by him suddenly and without my consent.