Fics like impulses long extinct

Kara finds herself thinking odd thoughts about her best friend and having impulses she'd thought were long extinct in Kryptonians, so she decides to acclimate the human to interacting with her how she wants her to. Lena, she learns, does not spook easily as she'd feared, and may well be attempting to train her as well, though either way Kara is pleased to end up with a cute human pet, her friend accepting everything surprisingly quickly, and then... Lena draws her attention to some things Kara hadn't realized about her human sister, and Kara accepts a very fun bet.

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