User blog comment:Rtys8/Okay, this is a bit of a problem..../@comment-16526045-20140902135331/@comment-4738138-20140902164208

You got it right actually. As Saiko and Takahisa only have each other, Saiko is said "to use sex to satisfy both Takahisa and she".

They didn't show it in anime because there were h-scenes between them, and they wanted to keep an audience so they skip this part.

Like Kukuri and Kakeru for example.