Weird gender meta
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The Standard Kalex Fic where Alex grows up protecting Kara, Kara grows up thinking the world of Alex, and they're exactly the sisters they're supposed to be (except they're not and they're gonna pine over each other for like eight years)--with an ABO twist.
Kara and Alex have finally managed to reach a place where they can both pretend they're happy with the roles they're supposed to occupy in each other's lives--until Alex goes into heat.
Y'know how you have that one fic (or genre or trope or whatever) that you swear you're never going to write? Yeah. This is that one.