"My wife's step-sister is so lewd..." The sexually frustrated married woman, Saki, shyly and frantically thrusts into her sister-in-law, whom she hasn't had sex with. (Okuda Saki, SONE-098)

Five years into their marriage, their relationship had become mundane, lacking any sexual intimacy. The honest and simple husband, Jun, felt uneasy about going to brothels because his wife rejected him sexually, leading a sullen and unhappy life. One day, his wife was going to a friend's wedding and would be home for three days. Worried about household matters while his wife was away, his wife's older sister, Saki, returned with her daughter, Sawa. "You're still young, and you already have no sex life... Ah, we're the same..." The sexually frustrated older sister tempted the sexually active Jun. In his wife's (sister's) absence, their bodies greedily clashed... "Even though we're related by marriage, since we're siblings, it doesn't count as an affair, right?" Jun, overwhelmed by the mature body that couldn't compare to his wife's and the trembling pleasure, ejaculated again and again.