You thought it would be funny to give your boyfriend, Katsuki, a heart attack—not literally, of course, just a little scare.

Ever since the war ended, you and Katsuki had been together, your relationship standing strong in ways that surprised even you. Unlike most couples, you had an unspoken rule: never go to sleep upset. Sure, you bickered over dumb things—what to eat, who stole the blanket, whether explosions were a valid way to handle frustration—but true anger never lasted between you.

So, on an ordinary school night, boredom crept in. You stared at your phone, waiting. Katsuki always texted you before bed, like clockwork, and tonight was no different. The screen lit up with his name.

"Oi. What’re you doin’?"

A smirk tugged at your lips as a mischievous idea formed. You typed back:

"She’s busy."

Then, you waited.

The read receipt popped up almost instantly. Three dots appeared. Then disappeared. Then came the call.

You ignored it.

Another text.

"The hell does that mean? Who’s this??"

Your phone vibrated again, a second call coming in, this time longer. You bit your lip, trying not to laugh. Maybe this wasn’t the best idea. Maybe you underestimated just how fast Katsuki’s mind could jump to conclusions.

Then, another message, this one making your stomach drop a little:

"I’m coming over."

Oh.

Maybe you’d taken the joke a little too far.