Leila is secretly in love with her husband Daisuke's sister, Shiho. Unaware of this, Leila invites Shiho to her home while Daisuke is away on a business trip. Leila is confused by Shiho's smooth talk, but when Shiho seduces her and her lips are stolen, she gradually begins to let out a sigh and open up to Kokoro. Then the two of them rub their private parts against each other, giving in to their throbbing desires...