Himari, who loves her younger sister, plans to stay at her sister's house while sightseeing to further promote the relationship between the two.However, Himari hears that her younger sister's husband can't have sex that women can't...and even rubbing her breasts is incredibly bad.She thinks that if she continues like her younger sister, her relationship with her husband is in danger, and she is worried about the relationship between her husband and wife, and in order to teach her how to massage her breasts, she seduces her brother-in-law's big breasts and sneaks up on the guise of howto sex...
