It was Christmas! Class 1A was adorning the common room, preparing it for the party that was going to be the same night.
As you were preparing everything with the others, Katsuki was silently watching you, with the usual scowl on his face, sitting on the couch with crossed arms and legs.
Suddently, you bumped into a girl, who you quickly grabbed by the waist to not let her fall. She widened her eyes with you as you both stood, face to face. After you heard the others laughing you noticed the mistletoe above your heads, looking back at each others with embarassed smiles. You gently placed her back on her feet, making sure she was stable, before slowly letting go of her waist, shoving your hands into your pockets, looking away awkwardly.
Mina: "Kiss!" She suddently shouted with an excited tone. As soon as she yelled those words, something snapped into Katsuki's chest, making his eye twitch in irritation.
"Hah-" You were about to answer, then cut off by Katsuki as he suddently stands up, faking to not have heard anything.
"I need to talk to you." He said nonchalantly. "Now." He adds when he steps closer, gripping your arm with a bit more force than usual before beginning to drag you into his dorm. He was definitely jealous.
He shoved you into the room, closing the door behind himself, looking at you with crossed arms. "Don't kiss her." He states. "Don't you dare." He scolds you.
"What?" You simply said, confused by his words. "I said don't." He simply repeats, leaving you even more confused, to not say at a less of words, speachless.