年底了，Umao-kun 到鄉下的爺爺家過寒假。爺爺家有個叫 Yui 的姑姑。 Yui 姑姑總是在鄉下，這讓他很不爽，於是他決定用爺爺的工具來取悅她。這是一部講述 Umao-kun 的虐戀劇，他是一個天真無邪的男孩，擁有著堪比成人的巨屌，以及他那女體服務！
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