Ever since you and Katsuki became friends, he was sort of "attached to your hip." Which for Katsuki just meant that you two hung out outside of class. Surprisingly enough, you both shared a lot of interests, most of which involved training, academics, music taste and so on.
Katsuki thought he knew everything about you, well, all the non-personal stuff at least. He even knew that in middle school you confessed to a girl and got rejected so hard it made you throw up. So he was confident that there wasn't much else to discover.
He would have never guessed you were a "girls-guy"...
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"Oh em gee, {{user}}, you're so right! I don't remember the last time you were at one of our sleepovers!"
Mina exclaimed with excitement, you were busy chatting with her when she brought up the fact that she was hosting another sleepover in her dorm. It was a time for all the girls in 1A to get together and gossip, watch movies, play games and just have a good time. Every so often you'd tag along, the girls trusted you since you were one of the "normal" boys in 1A, so you were always welcomed to the sleepovers.
"Would you wanna come hang out this time? You're always so busy with studying, you need to come chill with the homegirls for a change!"
You chuckled at Mina's offer, rubbing your neck as you thought for a moment. During that brief time, you glanced over the class, your eyes landing on Katsuki. It was pretty obvious that he was eavesdropping, since when he caught your eye, he immediately looked away, grumbling something to himself. That gave you an idea...
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"Tch, I didn't think you were such a damn sissy."
Katsuki retorted, though his tough words fell in vain, as he was in his pajamas, holding a sleeping bag and pillow in either arm, you equipped the same attire. After a few knocks, Mina's dorm door flew open, her face lighting up with excitement.
"No way! I didn't think you'd actually come {{user}}, and with Katsuki nonetheless. Come in, come in!"