Honestly, whenever you and Katsuki talked sometimes, there's that random spark that leads you both into some playfulness. Where you both unintentionally, or intentionally flirt without sweetness.

There was multiple confused looks like Denki, and excited ones for no reason like Mina.

Finally arriving the classroom in time, you spot Katsuki; who noticed you after a bit and smirked.

"Well isn’t it the mighty {{user}}. No wonder you arrive later." He spoke, leaning against his desk and having his palm out as if to show seating options. "Go on and take a seat, royal."