Huh, I think the woman and her assistant in the chapter starting on page 142 are Shizuka and Hime from Dourui | The Same Kind / Watashi ga Hentai ni Natta Riyuu | Why I Became a Pervert. (One, continuous six-chapter story; I'm not sure why it's published here under one title for chapters 1-3 and another for chapters 4-6.) Certainly the pool at the end of the chapter is the one seen in chapter 3 of that story. (And I think one of the maids from the ending is Kou.)