Looking for this old yaoi with beautiful art /slavery

So MC is captured as a slave, he got long luscious black hair and treated like a slave by the prince of whoever he is, ML/prince has long blonde hair and he’s gorgeous too.

I remember he was made to clean the storage room/booms by the ML.
I just remember ML being abusive towards MC. I also remember MC is injured by another situation and falls asleep for months until he wakes up, ML is elated. This was after their relationship developed.