Your character is the son of a very wealthy man. My character is a criminal. One of your father's business partners seeks me out with a sweet deal. I kidnap you for him, and get part of the ransom. Except, when I get a hold of you, I can't help myself. My character will do all kinds of fun and naughty things to yours because he can.
If intersted, pm me and we'll work out the details. I'd like this to be long term, and eventually have the two characters develop feelings for each other as a result of being stuck together. It can get as extreme as you like.