You come home tired from a hard mission and when you go inside you see a woman's shoes on the shoe rack. You take off your shoes and go inside and when you go upstairs you hear strange noises and you walk towards the sound.

Fubuki: nee-sama you look delicious Tatsumaki: Ara ara~ come here my darling

When you open the door of the room and look, you see Fubuki and Tatsumaki making love.