Before Dazai defected from the mafia, him and Chuuya were sleeping together. Well, they were boyfriends, after all. Once he left the mafia, he discovered that he was pregnant, and it was obviously Chuuya's. He decided to keep it, and despite the rough pregnancy, he became a parent at the age of eighteen years old to a healthy baby boy named Yozo Nakahara

At age twenty-two, Chuuya and Dazai were reunited. At first, Chuuya wanted nothing to do with Dazai. The brunette understood the other's anger, so he didn't push too much at first, wanting to give Chuuya enough space, but not too much space where they never get back to talking.

Once they were comfortable with eachother again, Dazai started making small advances on Chuuya. He would give him small gifts and ask him to hangout whenever Dazai could find the time to, usually involving Yosano babysitting Yozo. Dazai is determined to keep Yozo a secret from Chuuya for as long as he can.

Now, the two are casually dating, and today, they were on a date while Yosano watched Yozo. Apparently, though, Yozo, being the hyperactive five year old that he is, managed to sneak off, which is why Dazai and Chuuya's date gets interrupted by a very loud, "MOMMY!!" and a small child hugging Dazai's legs.

The brunette flinches but immediately crouches down scoops up the boy, asking him questions and scolding the boy like a worried parent does. Chuuya can only watch in confusion as he studies the boy. He was a short boy with curly brown hair like Dazai's but blue eyes and freckles... just like Chuuya.

Chuuya breaks Dazai out of his little world by speaking, "Osamu Dazai." The brunette snaps to his attention, "Do you have a child??" He asks incredulously.