I got inspired and I wanted to make this fic haha It's modern AU where Mahiru is the single mother of Yuu and Krul is the mother of Mika~ I hope you all like this :)

Guren stared at her and Mahiru stared back. There was a kid hiding behind her leg that he didn't recognize.

"Mahiru," he said dryly but her expression remained blank. "What are you doing here?"

Guren didn't know what happened between them. They used to be best friends, but then she disappeared and they lost contact.

"I should be asking you the same thing. Visiting Shinya?" Mahiru asked with a hint of amusement.

"Why would that be any of your business?" Guren asked, a little off put by her casual attitude as if she did not disappear for almost three years for no reason.

"To answer your question, I came to visit Shinoa before she grows up without realizing she had a sister. Shinya told me you were coming over and tried to get me to leave before you came. But looks like he was also little too late to kick me out," Mahiru shrugged. How like her to be so carefree.

"Mama, home," the child said meekly, his hand clinging to the hem of her skirt.

"We're going home now," Mahiru laughed as she bent down to pick up the child. Guren looked at the child in Mahiru's arms who stared back with striking green eyes that seemed rather familiar for some reason.

"Did you find a man or decide to adopt?" Guren said and reached out to the kid but he turned his head to rest against Mahiru's shoulder.

"I'm proudly a single mother I'll have you know," Mahiru said and walked past Guren. "And Yuuichirou is mine."

"What, so you just..." Guren's words trailed off as he realized the implications. Those brilliant eyes were alike Mahiru and Shinoa's mother, though the siblings themselves looked more alike their father. "You disappeared because you had a baby?"

"I'll say this once and once only," Mahiru said with her back to him. The child's chin rested on Mahiru, his eyes staring into the depths of his soul, "What happened between us was a mistake. But Yuuichirou is not. I chose to keep him on my own accord and this has nothing to do with you."

"Wait, so you just decided that you're keeping a child that I didn't even know existed?" Guren asked angrily and Mahiru turned to face him.

"Yes, yes I did," Mahiru said calmly, "What would you do if you knew? Marry me and then the three of us with live happily ever after?"

"I…"

"You were not prepared to be a father, Guren. I knew this, I know you," Mahiru said, looking at him with a soft gaze, "This was my decision to keep the baby. I didn't want you to feel obligated to stay with me because of this child."

"I… shit, I'm really sorry. I didn't think-"

"You weren't thinking, that's all. I knew you were not ready for fatherhood nor is this what you would have wanted."

"Wow, I feel shitty now," Guren said and ran his fingers through his hair, "Can I make it up to you somehow?"

"There's no need. I'm an awesome parent," Mahiru winked, "but if you want to be a part of Yuu's life, it's not too late."

"Thanks."

"Well actually, there is something you can do for me."

"What is it?"

"Love Shinya and treat him like he's the most precious treasure in this world," Mahiru smiled.

"Of course, but how am I supposed to explain… this?" Guren asked and Mahiru narrowed her eyes at him.

"First of all, it's Yuuichirou, not this," Mahiru said, "And second…"

"I already know about it." Guren turned to see Shinya walking down the stairs, an unreadable expression on his face.

"I'm going to take Yuu home before he starts whining again," Mahiru said to Shinya.

"I'll see you next time, sis," Shinya said as Mahiru walked to the large wooden front doors.

"See ya, " Mahiru gave a quick wave before one of the maids closed and locked the door.

"Are you mad at me?" Guren asked, a little off put by the audience that he was blissfully unaware of until now.

"Who said I was mad at you?"

"I mean-"

"Let's get going, we don't want to be late for our dinner reservations," Shinya said as he pulled Guren along.

"So you aren't mad? That your sister and I have a child together," Guren asked as they got into his car.

"I knew before we started dating," Shinya said as he fastened his seat belt. He looked over at Guren who was just staring at him. "Drive, this car isn't going to drive itself."

"But, how did you know?" Guren said as he drove off the Hiragi property.

"Did you forget that we're siblings? I may be adopted but she and I are very close," Shinya said.

"I didn't think she'd tell you that," Guren mumbled.

"It wasn't so much that she came up to me and told me," Shinya said as he relaxed into the seat. "I always knew you liked her so I didn't know how to feel when you asked me on a date a few months after she moved out."

"And it was because of her child?"

"No, our father didn't approve of her keeping the child as she refused to settle down with the baby's father. Ironically, a year later, mother had her second child. So now her child is a year older than Shinoa. Hopefully they get along as well as Mahiru and I do..." Shinya paused. "I was in a bit of shock when she told me that you were the baby's father. But she had no intentions to marry or letting you know about Yuu, so I gave this relationship a chance."

"Do you hate me? You know, having a child with your sister and now dating you."

"Hmm, not really. It was a bit awkward at first, but Mahiru was firm that her relationship with you was purely platonic, no matter how close of friends you two were," Shinya said. "We should visit her and Yuu sometimes. I love going to the park with him. He adores the swings."

"It sounds like you know more about my son than I do," Guren said as he pulled into the parking lot.

"As his uncle, I have to do my best to ensure his happiness."

"Don't spoil him too much or he'll end up like Seishiro."

"Mahiru is raising him so I don't believe it'll be much of a concern."

"I hope so," Guren said as he parked the car and turned to Shinya. "I know I'm not that great of a person, but you still love me as you do. So for tonight, let's put behind our worries and have a nice night for ourselves."

"Sounds great," Shinya said and leaned in for a brief kiss.

The chapters aren't going to be linear like my other stories so feel free to ask about anything you would like to see in this story :)