*raises hand* HC for the TND swap AU?
Joey and Mushi do not like the idea of their siblings 'liking' each other.
Joey: It's not that he doesn't like Kuki, he loves her. But he can tell Mushi doesn't really like Wally, so he doesn't want him around her.
Mushi: Thinks Wally is annoying but mostly it's because she doesn't want Kuki being around Joey and potentially revealing how many secrets she tells her sister. Secrets that could link her to...other teams.
Bonus points if the 'romeo and juliet'ness of it all just makes the kids dig their heels in more. Kuki wants the drama.
I like that!!! Let me shape it a bit:
Mushi really thinks Wally is actually a problem for her whole secret identity. The kid's stupid, of course, as stupid as her sister (they found each other) but if somehow he lets out about ANYTHING, her mission could be at risk.
Wally's VEEERY wary and suspicious of EVERY teen, so if he lets out even just a "Mushi's sus" around the others and someone starts to investigate, it could be a problem.
So she prefers him to stay as far away as possible from her, Kuki and their lives.
As for Joey, he actually likes Kuki a lot. And Kuki likes him a lot! To the point that, when she sees him, she has eyes only for him! And Wally doesn't like that.
Their relationship is already difficult as it is, it doesn't need unnecessary and unwanted jealousy! So he just keeps away from Kuki even if it's hard not to hug that sweet girl and talk Rainbow Monkeys with her!
But his lil bro comes first.
So yeah, they they find each other in the same mall at the same time with their lil siblings around, they will to the opposite way and avoid each other.
Kuki will REALLY start thinking it's a "Romeo and Juliet" situation and will start playing on it.
Wally doesn't even know what a "Rodeo and Mullet" is!