Minami, who lives happily with her husband and daughter's family, has been going without sex at night and has gotten into the habit of masturbating to relieve herself. Her son-in-law Tsuyoshi does the same, spending his days peeping at her and pleasuring himself. Minami is captivated by his huge dick and keeps trying to seduce him at every opportunity. Unable to resist his mother-in-law's advances, the two soon indulge in pleasure day and night...
