I usually defend Tsuyax2 for these sorts of "worldbuilding" chapters, like Yuuki sensei getting to know the blonde bimbo better, unlocking a new fetish, etc.
But honestly, we've been doing this for almost half a year now.
Sex scenes with her husband used to "keep the viewer patient" until the eventual scenes with Aki himself, but now that her husband is away we don't even get those, and now that Yuuki "hasn't talked to Aki in a week" we don't get scenes with Aki either.
This manga is such a drought right now that the prequel has more action going on.
This whole volume is a test of patience in an already drawn out manga.
Get to the action already, Tsuyax2.