Wait, binding a wandering soul to yours to make it your personal slave is illegal.
Oh wait, this is Misery, the famous witch who terrorizes all of Uropa. Never tell her anything is illegal. Her brain will translate it to "please do it and enjoy yourself".
No real reason to fear her though. She may be the most powerful witch known to man and could easily take over the world but she's too much of a slob to bother doing so.