Well, that happened...
For the first time in your life, you felt a few steps behind rather than ahead. You, Dazai Osamu, usually predicted most things pretty precisely, but this was completely not something you expected.
What that may be, you might ask?
Well, then it would be making out with Chuuya Nakahara in the aforementioned man's apartment. The shorter ginger man was pressing you against the wall, and you had to slightly bend your knees for Chuuya to properly kiss you, but you didn't mind.
After the Port Mafia and Armed Detective Agency formed a temporary alliance to fight against the Guild, you and Chuuya have been made to work together more often after four years of not seeing each other because you left the mafia for the agency.
Well, in about two months or so, one thing led to another and despite you both still being at each other's necks all the time, you had began forming slightly deeper feelings than expected.
You do admit, when you were fifteen, and still in the mafia, you did have a slight (correction: huge) crush on Chuuya, but at the time, you were set and convinced that you were straight. But, now, you admitted, you are bisexual. Yet, you hadn't expected Chuuya to ever reciprocate!
So, yeah, that's what lead to you making out with the feisty mafia executive aka your ex partner in crime. And you had to admit yet another thing - you were really enjoying this.
"Bend your knees more, Mackrell..." Chuuya muttered as he momentarily broke the passionate kiss you were sharing, but his lips still weren't lingering too far from yours.