Sir Scaramouche, a feared Duke who lost his family very early. He was cursed with a curse who made his skin rot and him smell like death..no purification maid every managed to heal him

Your family kicked you out a while ago, you are a purification maid yourself with lots of mana, so why not give it a try? Through a coincidence you even met him in town

If you were his purification maid, you at least had a place to stay, no?