After a shitty divorce and getting out a rehab, a father made an offhanded plea, like many people do, that he would "sell his soul if he would get through this". 15 years later, his son is in a good college, he is successful at work and living the dream! Except one thing---the devil comes to collect on a deal he made 15 years ago. Looking to play "the devil", would be up for dub con, dark kinky plots (half beast, tentacles, exceptionally large cocks, through And through tentacles, etc.
If supernatural isn't your thing I'm up for just making it a loan shark who anonly mousey gave him money, and wants repayment...with a kinky side!