Hermione wasn’t sure what that could mean for her. Why would a person like that want her as his wife? Certainly, the reason cannot be anything good or rational. He must want her just to humiliate her, insult her, maybe even physically hurt her – all because he could and would have the right once she became his wife. He probably also wished to use her as his personal slave – in more ways than one. Why else would he ask for such an absurd thing?