Ms. Muramata's Secret 3 / Momose Knows

Muramata's Secret 3: At work a bunch of paperwork need revising. Muramata takes that task on herself and sends her staff home. Kaji however refuses to leave. He wants to pamper his senior, and Muramata accepts… Momose Knows: The four heavenly queens of school, an unapproachable challenge. When one of them asks you for help, you help! But what is this... she wants to learn how to make her cock bigger!? What?