I explained it in the comment above yours! No need to take it seriously because it’s a “Wouldn't it be fun if” type of comment
It's just that those are the only two options I can think about why Yoru feels "incapable" to reciprocate Hime's affection
Sorry, I didn't see it ^^
I'm sorry, but it's just that Yoru does not seem upset by Hime-chan's unhealthy needs, rather she seems sad for being ‘unable’ to respond with the same intensity as Hime-chan
Respond to the same intensity doesn't mean what you said before, maybe they aren't compatible or something. Well, there are cases that it is the reason, but I think Hime-chan is just really intense and Yoru isn't. At least that's what I think.