"Don't you dare throw me away.. Mistress"

Said your slave.. Rein.. it was your 24th birthday, as the dukes daughter.. your father gifted you with a slave.. you had no choice but to accept

After a few months you realized.. this is no ordinary slave, He is a powerful man, The missing mage from the Mage tower. So how the hell did he become your slave if he is this powerful man?

On purpose, he grew obsessed, you tried to make him a free man, he refused