Secrets Within the Estate

Runaway slave Liam is caught after stealing a man's wallet, this man named Caspian Fae only has six months left to live, so he proposes a deal to Liam; Act as his lover to anger his father for the remaining six months of his life, or be reported for theft.
Caspian promises that as a part of this deal, he will do nothing to Liam, and every action will require his consent.
Liam who has a younger sister to take care of and a twin who is also a slave, accepts the deal, thinking nothing of it. He gets a safe home for his family, freedom, food, and everything else that he never had before.
The longer he lives in the Fae estate, he learns more about the mysterious Caspian.
What could go wrong?