Yumiko is a mother who has raised her son by herself. - Thinking about his mother, the son touches Yumiko's body to give her a massage, but by an unexpected accident he ends up stimulating Yumiko's braless nipples. - Yumiko always wears no bra at home, but when something unexpected happens, she freaks out and overreacts... - Seeing his mother like that, the son adds more stimulation to make her feel even better. - That night, Yumiko comforts her body, which has become sensitive due to the sunburn, and goes to work the next day without a bra.