Saeko, a mother with little interest in fashion, pays no attention to her son Hiroshi's pleas, saying, "That doesn't suit me." But one day, Saeko finds a sexy swimsuit she's never seen before in the laundry, and out of curiosity, Kokoro decides to try it on... A swimsuit with a tiny amount of fabric that she would never normally wear... The shameless appearance of Saeko in it brings a tingling sensation she had almost forgotten to her crotch, and she indulges in masturbation on the spot... "Mom, you were so pretty and sexy," Hiroshi says, suddenly appearing, and happily embraces Saeko in the sexy swimsuit he prepared for her...