Dai, naive about sex, was troubled by his erect cock and didn't know how to release his tension. He spent each day restless and frustrated—until one day, he finally confessed his problem to Momoko, the mother of his friend, who had always treated him kindly. Though initially hesitant, Momoko decided to help him by giving him secret lessons in sex. Overwhelmed by the new sensations, Dai quickly became aroused, lost control, and impulsively pushed Momoko down. As he thrust into her passionately, the deep stimulation sent Momoko into repeated orgasms. This intense encounter deepened their forbidden relationship even further.