Shiho and Rei of the Sisters close from old days. However, the Rei is divorced, and have relations with a son of the Shiho which is a nephew triggered by Tako. The Rei which it was relations of the Naisho in Shiho, but flirts with a nephew in front of Shiho as if I assume a defiant attitude when it comes out. The Shiho has relations with a son of the Rei which is a nephew to see such a Rei again. The Sisters which knew each other's relations takes a bath in four people; and….
