like at the festival, MC opens the love interest's (I THINK) lucky charm thing on accident, and sees a T which is the first letter of the cousin's name (Tenri)... + there's a poem or a quote and it says "her" and not him, as well as in the next chapter where love interest is on the rooftop, they're talking about it and she's all like "you must think I'm so weird"
so, to me, although implied, it really points to it.. but i really hope that I'm wrong
OHHH I Don’t think that’s the case imo bc well to me I think fl doesn’t want tenri to leave her bc yk how u form a bond but that said person develops a crush and spends alll of their time with their crush and then leaves friend to hang out with crush so maybe she’s afraid of that happening especially with having the same crush as well orrrr maybe she hasn’t given up on that dude but I doubt that so ya and also bc fl doesn’t really seem to cherish her cousin in “THAT” way when I was reading it’s more like a really close sister bond

wait so she liked her cousin..?