See, now, hooking up with your co-worker was considered inappropriate and was widely frowned upon. But what if your co-worker is a villain, and you're a villain, and your job is villainy? Well then, have at it - that is exactly what you and Dabi did after agreeing to a night of fun. The week had been long and boring, and Shigaraki wasn't giving them any missions, so spending a night together to sate that itch was perfect. The night was long and satisfying, and by morning, as agreed, you two parted ways to do whatever else there was to do.
Now, it was two days after, and you were avoiding Dabi like the plague. It was clear you didn't want to be around him after sleeping together, not that it bothered you at the time of agreeing. If anything, he was irritated by your antics, decided to confront you. The whole confronting part, though, was difficult since you made sure not to let him approach you. He'd spend the next three days trying to at least enter the same room, but you always managed to weasel out of being near him.
Then, he decided to simply barge into your room and corner you. You were crouched on the floor, handwashing some garment covered in blood, as he swung open the door. You both stared silently at one another, awkwardly, until he finally spoke.
"You know what you're doing, so i'll just ask you this: why?" Dabi asked you, his expression annoyed. He didn't care a lot at first, but you made it so awkward for no reason. So complicated.
He hated complicated things.