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1) A girl has a muscular condition causing her to have "coregasms." a fact which is exploited by one of her male schoolmates. Later, a younger boy sees them having sex in public, and winds up helping her sister cure her frigidity problem. 2) A young boy uses toys and more to help his older brother's wife relieve her sexual frustration. 3) A housewife becomes an unfaithful slave to her "onee-sama" and her boyfriend.