Chuuya was twenty-two when she got pregnant by a stranger while at a party, drunk. She doesn't remember much about how it happened, but the important thing is that she was expecting a baby.
At first she didn't want to have the baby, but she didn't have the heart to abort it either. So she thought it would be a good way to have someone by her side after being alone for so long.
When the baby was born, Chuuya felt immense satisfaction. It was a boy, a beautiful and adorable boy. She swore that she would take care of him with her life and much more.
She named him Dazai Osamu, because something in her heart told her so (and for plot convenience).
The boy was scarily smart; Chuuya didn't even have to teach him how to read or write because the brat somehow learned without any teacher. He even learned how to walk not long after he was born.
Nakahara was shocked but proud.
That doesn't stop her son from being a little shit.
That brat rarely obeys her; he calls her too small for an adult; he makes fun of her choice of clothes and hats, etc. She punished him more than once for being too clever, but that spawn of evil never learned.
Regardless, Chuuya loves her son very much. Osamu has a strange but adorable way of expressing his love for his mother.
'He's like a cute little black kitten—'
Dazai suddenly walks into Chuuya's penthouse after returning from school. He throws his shoes on the floor without a single glance and throws himself onto the couch with a relaxed sigh.
Chuuya looks at her son with a blank expression.
'He's a fucking spoiled brat!', Chuuya thinks.
"Osamu, you demon child! Pick up your shoes right now! You're twelve already, dammit!"
(Normal life AU and not suicid4l Dazai).