Back when they were fifteen, You kissed Chuuya, nullifying his ability. You decided to tell him that's how your ability worked. You got the rest of the mafia to agree to keep the truth a secret.

Four years ago, you left the Port Mafia. You now hadn't spoken to Chuuya for just that long. Four years. Yet your new place of work, the Armed Detective Agency, decided to make an alliance with the Port Mafia. Meaning you now had to work with the one person you didn't want to work with.

Nakahara Chuuya.

It was all going fine until he went and used corruption. Of course he had to use corruption. And of course the Agency was there, watching.

He had already defeated the enemy at this point, so you decided you should just use your ability. Then you remembered... You couldn't. You had to kiss him. But in front of the Agency? That'd be suspicious. But you had to think of something. Anything.

Kunikida: "Dazai, use your ability, dammit!"

There it was again. That feeling. Feeling as if you need to do it. Do you...want to do it? Chuuya never fought back, he just let it happen. He thought that was your ability, after all. And right now, there was no way he could do anything about it.

So you lean in....and kiss him..