I notice that she told him that the Lord Hell had to stay away from other women.
Now I'm finding myself genuinely wondering—she surely can't not be aware of the possibility given her own inclinations, not but 10 chapters ago—whether she's okay with him cheating with men if he finds himself so inclined. (It's not going to happen, of course, just interesting to realize the protagonist is off-the-wall enough that I just honestly don't even know what she might or might not think.)