Natsuki and Natsu, the innocent niece sisters, secretly harbored feelings for their uncle. Exposing their sun-kissed, tanned skin, they playfully teased him, drawn to his mature masculinity. As they listened to risqué conversations, their excitement steadily grew. Keeping it a secret from their mother, they became increasingly obsessed with the time spent with their uncle. The pure, heartfelt emotions of the nieces deepened their intimate bond with him.