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Mei, a high school girl, is always looked at with unpleasant eyes by the man who became her brother-in-law due to her parent's remarriage. Unfortunately, it was discovered that she was dating a teacher at school... Mei's weakness was seized and she acted aggressively, but due to the aphrodisiacs secretly added to her and the persistent teasing play, her body gradually started to react and she came to orgasm. From that day forward, Mei became addicted to sexual pleasure and became addicted to sex with her brother-in-law, whom she disliked despite her heart.