In an AU where slavery exists, Matt was sold into slavery as a child, maybe after his father's death. Your choice as to whether or not he still has his super-senses. Fast forward several years. Still-a-lawyer Foggy runs across Matt at a slave auction, and buys him to protect him.

Matt is trying everything to please Foggy, waiting for the other shoe to drop. He tries to seduce him, hoping for a return to normalcy. Foggy doesn't realize exactly how afraid of him Matt is. When he does, he does everything he can to make it better.

Those specific things don't have to happen but I'm really looking for slave Matt and kind, sort-of-oblivious master Foggy. Bonus points for collars.