If anything I think Skylark makes her tired because sometimes she looks away and the next thing she knows she finds out he ran off and got himself into trouble. At least Hizen doesn't literally bite probably????

I also noticed you mentioned on Plurk about potentially looking for roomies for Hizen, and if that offer's still open I'd be happy for Skylark to be a roomie with Hizen. He can cook and clean and do chores and would prefer to live with some people as opposed to by himself, haha.