She does

Despite herself, Aomi slowly entered their bedroom, where Shioko kissed Danjuro without a care in the world. Shioko smiled upon seeing the damp patch on Aomi's pants.

"I see someone got excited," Shioko mentioned, "Would you like to join in?"

"...What?"

Aomi could not believe her ears; did Shioko hit her head somewhere, or had she finally snapped from all the stress of work and police politics?

"Mom..."

Aomi blushed when she saw just how darned cute Danjuro looked, face flushed with arousal and sweating bullets. Swallowing nervously, she entered the room and closed the door behind her.

"So, exactly what is going on?" Aomi cautiously questioned.

Shioko got off Danjuro and went to hug Aomi, pressing her body firmly.

"Wait, what are you doing?" Aomi questioned.

"You've been through so much and never had the time to truly get over your trauma," Shioko said, her voice soft and gentle yet hard as iron, "And you've had to raise your children all alone. I never saw your suffering, never helped you. I and Danjuro want to help you. Will you let us help you?"

"I... I..."

Aomi dared not think of it; incest was heavily frowned upon in Japan, relationships with huge age gaps even more. Not to mention if she went through with it, she'd be considered a pariah if anyone ever found out.

And yet...

Aomi sat down on the bed, with Shioko on one side and Danjuro on the other.

"Are you two really fine with this?" She asked, "I mean, you both already have a loving relationship..."

"We're sure," Danjuro smiled.