Responses
The recent chapters show an implication that he may have feelings for his aunt. But of course, we're only getting the pov's from FL and the cousin - so this could all be misconstrued by them. That's why OP made this comment, that they'll let it marinate for now, in case, the author really pushes it to a weird, incest direction.

I thought it's gonna be cute and all that but now idk
probably the aunt .. ugh
I think i should let it marinate at this point
It's making me.. Ew