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Katsuki having a heart rate monitor after the war to track if he has any spikes since his heart won’t be the same, but every single time he’s around Izuku it gets a little faster and he’s so embarrassed and frustrated because before he could hide behind his cold expression and no one would know but now it’s really obvious how flustered he gets, and years later when they actually confess and kiss for the first time, when it starts to get hot and heavy it spikes so hard it starts beeping and Izuku is like ‘wait are you okay that doesn’t happen has that happened before kacchan?’ And Katsuki is just like ‘YES IM FINE WE DONT NEED TO STOP ITS FINE’ and he’s just smacking the watch like shut up shut up shut up