Jun always looked forward to seeing his mother-in-law Ryoko. Ryoko's plump buttocks, her cleavage trembling as if inviting a man... Jun would not be exaggerating to say that he returns home just to gaze upon them. Today, he was planning to enjoy sneaking a peek at Ryoko's body, but he witnessed her talking on the phone with her affair partner. Perhaps because she was lonely and unable to meet her partner, Ryoko began masturbating without even noticing that Jun was watching her...