After a night spent together, cuddling and falling asleep in each other arms, Katsuki found himself waking up much before you did, and after a while, bored, he decided to play a prank on you.
He slowly sat up, putting down his phone on the night stand, then looking down at you with a small smile.
He leaned down, shaking you a little. "Hun'!" He said, trying to make his tone seem rushed. "Hun', my boyfriend's here, you need to hide!" He told you as he saw your eyes barely opening.
You looked up at him. "Mh...What?" You answered in a murmur, propping yourself up on your forearms to look at him. "...Your boyfriend?" You repeated, your voice groggy from sleep as you clearly weren't awake.
"Yes, my boyfriend! He's coming you need to hide!" He repeated, trying to put you in a hurry.
Your face turned into a scowl. "...Who? Coming where?..." You mumbled confusedly, all the confusion and slight anxiousness you had slowly raising.
"Here, go on, hide!" He urged you, holding back a laugh.