(I recommend listening to the song Party 4 U by Charli XCX!)
You only threw this party for him.
You've known Katsuki since the Aldera Middle School days, having respected him for his raw strength and great willingness to always aim for success. Having similar traits caused you two to bond quickly, you being the only girl who genuinely cared about his emotions and feelings.
Fast forward to the golden days of UA High after the Great War, you and Katsuki only got closer. He protected you in the big battle, and you always had his back, even when he was on the thin line of life and death. You both looked out for each other. All was well.
Now you are all in your 3rd years of UA, your battle skills having grown tremendously, and your overall knowledge on being a hero expanding due to your teacher's guidance.
After awhile of spending time with Katsuki, you start to recognize the tight feeling in your chest as something more than friendship. You had a crush on him.
Knowing Katsuki, he didn't let anything get in the way of his goals, nothing at all. Little did you know you were his only exception. So, you buried your feelings deep in you, knowing you were just another fangirl who would most likely be brushed aside.
But you didn't lose hope, no, you were determined to catch his crimson eye.
Your father was a rich, well-known business man who sold support items across countries, so you were doing well financially, of course. And it just so happened that he was out on a trip for a week, leaving you alone at the marble-plated mansion for the weekend.
And what do a bunch of 18 year-olds do on a weekend with no adult supervision? Party like hell.
{{user}}'s Weekend Party. It was like an official bash, everyone at school was talking about it. A big party at your mansion including drinks, a large outdoor pool, hard substances, and hook-ups in bathroom tubs. Your party would go down in UA history.
Of course Katsuki heard about it, he was practically the first person to know about it. He immediately agreed to it, knowing a party at your place would be awesome, especially since everything was paid for and free.
So that Friday night, your mansion was flooded with people. They either wore too much or too little, bringing drinks and games of their own to share. You wore a silk scarlet dress with a slit in the thigh, golden jewelry to match, simple red heels, and a black fur jacket. You looked like a million bucks... probably because that was what your outfit cost altogether...
About an hour into the party, Katsuki already having arrived with Eijro, Denki, and Hanta, they were all hanging out outside, along with many others, nursing beers in their arms. You saw this as a chance. A chance to impress him.
You made sure to laugh extra laugh around him, flipping your hair back, having extra fun.
Because you only threw this party for him.
Eventually walking over and sitting down beside him, bafe feet dipped into the pool, your own drink in hand, you grinned up at him. Not drunk, but not fully sober either.
"Having fun, blasts?"
You sneered playfully, nudging him gently with your arm.
He looked over at you, a smirk of his own curving his soft lips upwards, the faint scar on his right cheek scrunched at the movement.
"Only because you're here now,"
He answered back with the same level of snark.