A tired mother, worn out from raising her children, checks into a hot spring inn hoping to take some time for herself. As she tries to relax in the mixed-gender bath, an unexpected encounter leads to a man hidden behind the rocks beginning to tease her nipples through her thin towel. Her soft nipples, overstimulated from too much nursing, have become fluffy and sensitive like cotton candy. Pinched and sucked, the increasingly responsive nubs send waves of forbidden pleasure through her body. The sensation of them hardening drives her into a sinful ecstasy. Drawn into an illicit affair, she finds herself helplessly consumed by the thrill of cheating sex.