Contract Succubi

I plan on having a variety of succubi in my stories. In Trained by a Succubus, they are bound by contracts - a deal where you trade something to the succubus for something in return. Wealth, love, physical alterations. As long as it's possible with my magic system, this succubus can perform it. It can be something small such as trading a valuable virginity for a simple pump-and-dump. Or something bigger such as selling your soul for riches.