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We fell in love, got married, and after 5 years of being a married couple, our relationship hit a rut and we became sexless. Jun, a simple-minded and serious husband, is rejected by his wife and spends his days in agony, unable to attend adult entertainment. One day, my wife had to go back to her hometown for three days for a friend's wedding. Worried about the housework while his wife is away, his wife's older sister Saki comes over with side dishes and other items. ``Even though you are young, you guys are already sexless...Oh, so am I...'' The frustrated married sister-in-law seduces the young Jun, who has a lot of sexual desire. And while the wife (sister) was away, the two devoured each other's bodies... ``We're in-laws, but we're siblings, so it's not cheating.'' Jun ejaculates over and over again due to the ripe body and trembling pleasure that he can't experience with his wife.