Yoshikazu was taken on a family trip by his mother. There, he was captivated by the bewitching allure of his aunt, Ririko, whom he reunited with after a long time and who shamelessly displayed her sexuality. When Ririko saw his huge cock at the hot spring, she casually decided to take his virginity. However, awakened to sex by his aunt's guidance, Yoshikazu turned into a beast—like a monkey who just learned how to masturbate—and fucked Ririko over and over again. But Ririko responded in kind, writhing violently and repeatedly reaching climax...
