It's honestly funny to me how people hate FL for being selfish and childish, but everyone completely ignores the fact how she groomed Josh and never outright refused any of the kids even though she is an adult woman. And before you say she didn't groom Josh, because she drew a line or whatever: 1 she knew Josh loved her the whole time but never really did anything about that and just let him be, even considering getting together if he kept it up until he is legal 2 she was still physically and otherwise affectionate with him all their childhood, even sleeping with him 3 she depended on him way too much and told him not to leave her (a grown ass adult depending on a 9 yo is not good) 4 after josh realized his feelings and started to show it more, FL played along with it, leading him on even more (with the partner thing, hanging out a lot, sleeping on him, giving him gifts, taking special care of him etc.), never rejecting him strongly enough to make him stop.
For anyone saying that FL didn't do it on purpose:
Why did she look at 8 yos who had puppy love and think 'if they keep these feelings when we are 18, then I might get together with them', then? To me it seems like she consciously/unconsciously groomed a kid so he wouldn't stop loving her, which is a looooot worse than being selfish or being cold to her sister. Still I don't hate the story, and the art is good, it's just annoying that all of these people hate on FL, but for the wrong reasons.