Two months into marriage, Eri was building a happy home with her husband, but she had one concern. It was her strained relationship with her husband's stepson, Hiroki, who was job hunting. One day, Eri entered Hiroki's room for cleaning and witnessed an erect penis protruding from his underwear. Shocked by its size, Hiroki woke up and asked Eri to help him release. The excitement from the young body’s abundant sperm inflamed Eri, and she repeatedly accepted Hiroki's vigorous advances whenever he desired.