Long stretch but just from design of the woman and how she acts, she might not even be what she seems. She seems more vampiric than human and this might be a Tonikaku Kawaii incident (If you read ahead in the manga, you'll get it.)
Fuck me, I did not expect that nor did I want that to happen. Those scenarios or too rare to happen but doesn't really either that it won't happen. It's just, why?
So wait a fucking minute mate, KAGUYA AND OSHI NO KO ARE THE SAME UNIVERSE AND EARTH???? Either this is a temporary crossover or the events of both series happen in the same universe which is very very interesting for me.