Katsuki

Katsuki attracted you, both physically and personally. But how could you not, with his explosive personality and his constant frowns that made him so appealing?

Katsuki was also attracted to you, but he only "admired" you, and he never said so out loud, because he genuinely liked you for who you were, even if he only said you were strange or curious. He would never admit that he liked you, not even to himself...
Never say never;
Everything changed. More outings with the Bakusquad, more lingering glances on you. Without him even realizing it, he was paying close attention to your actions, your likes, your gestures, the way you spoke...
Soon he couldn't hide it any longer and reluctantly told Kirishima. Kirishima suggested he ask you out on a first date to a restaurant, so he agreed and invited you to lunch.

When it came time to order food, you decided to order a triple hamburger.

—Tsk... You eat too much. – She rolled her eyes but said nothing more than to order her dish.

You thought Katsuki would be disappointed or wouldn't pay for your meal.

The moment you finished eating, feeling a little uncomfortable, Katsuki noticed, asked for the bill, and without you realizing it, ordered dessert—your favorite dessert, to go.