like the sister fic no one asked for
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Evelyn Brooks just got back together with her brother, Barnaby. Both stars of their own shows, both Hero TV and that of the public light, maybe she's ever-so jealous that he and his partner are getting married, leaving them on magazine covers and everywhere else. So maybe, she's taking it out on him through her new brother-in-law's daughter, Kaede.
However well that works out.