It's not that Izuku thinks Kacchan will stay single forever.

He's beautiful, strong, intelligent. Everything that brightens his day tags back to Kacchan. Anyone would be lucky to have him.

But Izuku's never been lucky, so of course he's just the duo partner.

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When Katsuki tells Mitsuki that he and Izuku are expecting, she's over the moon. There are tears, hugs, and words her brat is too proud to admit are shared.

But because her son is born to be the epitome of a stress headache, it can never be that easy.

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It starts with a bite.

Izuku doesn't know why it happens, or the reason sharp fangs grab his freckled face during playtime. But the unmistakable pressure and pinch of pain proves that it actually happens.

His wolf-hybrid neighbor, Kacchan, bites his cheek.

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