Nao and her husband have been married for a while, their life is very happy except for the fact that her husband's little boy is very small, and he is physiologically weak, making Nao always feel deprived of sex. Because she wanted to help her husband, she went to work part-time at a coffee shop. The owner here is very good, and the shop is always crowded. At first, she was not used to it, so she often made mistakes, but the boss always wholeheartedly instructed her. But he also had his own suffering, which was that his cock was too big!! His wife, unable to stand his big cock and seemingly endless sexual needs, walked away. And when Nao came to work here, he was attracted by her beauty, knowing that Nao's husband could not satisfy her, so he begged to have sex with her. Although she always refused, her body seemed to be unable to resist the pleasure from the big cock that her husband couldn't give her! And since then, Nao's mind only contains the image of the shopkeeper's big cock. Although she feels guilty towards her husband, her sexual desire is too strong; only the bar owner can bring her satisfaction...