Look, y'all are bloodthirsty as always in the comment section. I get it. I'm petty as hell, if someone eats my leftovers I want to fuck with them for months to come. But this makes sense. The whole thing is Ruri being a "warm" person and that attracts the fairies and Asahi to her in the first place. This is like the whole point of who she is and why several things in the setting are the way they are.