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'Ayumi' and'Kenji' lived together with Kenji's father,'Tokuya', who needed long-term care. The same couple who usually need aphrodisiacs for their night life ... One day, when Tokuya went looking for a medicine for his illness, he accidentally swallowed the aphrodisiac. Tokuya realizes that his crotch is getting hot, and when Ayumi chews it, his desire explodes.