'Cause we don't know what tomorrow will bring (Smut)

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The night before the young heroes go into the decisive battle against the League Of Villains, Katsuki's inner alpha just won't let him rest and wants him to finally admit his feelings before it might be too late.

Izuku also lies awake and has a similar conversation with his omega. When Izuku finally plucks up the courage to get up and leave his room, he runs into Katsuki, who has continued his restless wandering in the corridor outside Izuku's room.

What happens when they both give in to their instincts?