The Shirt

Alpha Katsuki and Omega Ochako had a bond that the rest of Class A could never understand. Their scents changed when they were around each other, as Kirishima so obviously pointed out. Despite the facts that practically screamed, "Hey! You like each other," the two remained blissfully unaware.

Until Ochako asks for Katsuki's shirt. Specifically, if she could have it for her nest.