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-They wouldn’t argue a lot. Of course they’d bicker every second. But actual fights are a rarity.
-Katsuki carrying Shouto to bed when he falls asleep in obscure places? Yeah.
-Shouto lives to back hug Katsuki. Definitely when Katsuki is cooking or studying.
-Wouldn’t say “I love you” a lot. They’d say it in general, but just not as a goodbye in a phone call.
-Katsuki strives to make Shouto smile and laugh. It became his main goal behind becoming the number one hero.
-Shouto asks for a cat every week. The answer is always no. Rip Shouto.
-Shouto’s high maintenance. That’s all I have to say on that matter.
-Shouto loves to hold hands with Katsuki. He’ll swing their hands back and forth like an actual child. Katsuki will glare at him but won’t do anything because he knows it makes him happy.
-Shouto does that nose scrunch thing whenever he gets confused and Katsuki dies every time he does it.
-Shouto may or may not be obsessed with Katsuki’s arms. He likes to hold onto one of Katsuki’s arms and run his hand over the arm. But he’ll NEVER admit that verbally because he doesn’t need Katsuki’s ego to inflate more than it already is.
-Katsuki calls Shouto Princess. Both in a mocking and endearing way. It just depends on the context.
-Shouto would definitely sneak into Katsuki’s dorm room to sleep. Katsuki isn’t even in there half the time. Katsuki’s room just hits different for Shouto. It makes him feel safe and comforted.
-Shouto would be exactly an inch taller than Katsuki, and he always brags about it.
-I feel like they’d both be jealous of Deku’s relationship with the other...
-Trash talk Endeavor. Katsuki would also definitely answer Shouto’s phone whenever Enji called. He’d be like “Who’s this? No I don’t know of any Todoroki Shouto. Wrong number.”
-Katsuki and Rei would become the bestest of friends. No doubt about it. They’d have tea and just gossip together. Half the time Shouto isn’t even invited.