Takumi is in for a treat: in previous chapters, he had sex with Saki, then her sister and finally her mother. Now he gets to do that again, except with all three of them at the same time. In cosplay, even. Yep, it's time for "Asai family harem", as Saki aptly puts it.
Also, keep in mind that this 64-pager has "Part One" in the subtitle. Once again, Labomagi is not messing around.
*All characters depicted in this work of fiction are adults, regardless of their visual representation or textual description, and are not based on any real person*