Those who can't do, teach

Voldemort survived the last battle. The Wizarding world wants to execute him. Harry does not want to spill any more magical blood. Perhaps the solution to the curse on the DADA position at Hogwarts is the man who cast the curse? Harry ends up with a slave he doesn't know he he has and a position as the assistant DADA professor to Voldemorts position as the DADA professor.