Nao and her husband have been married for a while, and their life together is very happy except for the fact that her husband's penis is very small and he has erectile dysfunction, which makes Nao feel sexually unsatisfied. Wanting to help her husband, she took on a part-time job at a café. The owner is very kind, and the café is always crowded. At first, Nao made mistakes as she was not familiar with the job, but the owner was always patient and helpful. However, the owner has his own struggle - his penis is too big!!! His wife couldn't bear his large penis and seemingly endless sexual needs, so she left him. When Nao started working there, the owner was attracted to her beauty and knowing that Nao's husband couldn't satisfy her, he begged to have sex with her. Despite always refusing verbally, Nao's body seemed unable to resist the pleasure from the big penis that her husband couldn't provide her! Since then, Nao's mind is filled with the image of the owner's big penis. Although feeling guilty towards her husband, her sexual desire is too strong, and only the café owner can bring her satisfaction...