@Mangamoz you need to fuck right off with that. This cat isn't trying to get in the way of their relationship so she can have him all to herself. She protecting her family member from a dangerous demon.
CATGIRL PROTECCS
I think she is doing this cuz she is worried a succubus is just messing with Yuuki, but probably this arc is just gonna make so that Nono proves she really likes Yuuki ...? Its just a guess, Maybe not
@Escheron It's a supernatural demon cat I don't think it will be harmed by human medicine anyway you know, I assume this will all end with just a hug or something and all will be fine