Due to work circumstances, Kaori, the aunt of Yuuki who she lives with, has started to feel him as a man. She tries to make him her captive by subtly showing eroticism whenever she can… Seeing Kaori's lewd behavior, Yuuki's heart is shaken, but he manages to hold back. However, when Kaori catches him in the act of masturbation, she seizes the opportunity and sucks his cock. Unable to endure the waves of pleasure, Yuuki reaches his limit...
