In order for the affection between family members to become closer and closer, the beautiful sister Shibuya and her husband visited their lewd sister and brother-in-law. As soon as he entered the house, the gestures on his brother-in-law's face showed the dark plots hidden inside him. Just waiting for a good opportunity, he would immediately take action and the result was a satisfying success when only his sister and him were at home. He crushed her and used all his strength to be able to rape and satisfy his bestiality even though his poor sister was constantly screaming and teasing.