He's the one who loves her.
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For all her griping, she’s just his type. He doesn’t know why he hates himself so much that this is the kind of partner that he wants, but Kensei is past trying to figure it out. Mashiro is going to do whatever Mashiro is going to do, and as long as he is in love with her, he has only himself to blame for getting caught up in the middle.
He can accept that, but that doesn’t mean he won’t still give her a hard time, completely immune to all the ways she has come up with to insult him.
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