Remember that the cuckoldiing before sempai was
>had sex with random guy>Shu bangs Haruka afterwardsEven with sempai he still could bang Haruka(hotsprings)
The reason why he didn't touch her after that was because he thought she didn't want him do her
But now she has the absolute control on their sex life.
In
>>4092615 according to summaries Shu had a hard on Haruka noticed but told him "you have to go to work".
Shu had been enduring the boner since then until his boss asked him about the rumors.
Then we have the scene of Haruka and the dolls "talking" in between.