Tomoya, who had a quarrel with his friend Kenji who had come to play, made Kenji unable to move with handcuffs and went to play somewhere. Tomoya's mother, who returned after a while, searched for the key to remove the handcuffs, but the key was tied to Kenji's cock. Kenji, who is impatient, tries to get the key, but his mother feels strange while watching the Gaman juice dripping from the cock that erects due to the stimulation of his hand. Sisters….