Akira has noticed his wife's mother Dan's overly erotic body. He wants to see that voluptuous body just once. Unable to contain his Kokoro, he peeks at his mother-in-law changing clothes, and it's even better than he imagined. The shapewear she's been wearing to combat middle-aged weight gain is stretched to the point where her large breasts are forced to burst. Akira can't stop swallowing at the sight of her mature body through the mirror.