A mature love story depicting Monaka-chan's first experience inserting a cock. The uncle touching Monaka-chan's crotch is a special act between two people who care for each other. An exemplary attitude—she steadily takes the cock deep into her throat, no matter how gently and thoroughly it's thrust. Her desperate attempt to learn the taste of cock, rolling her eyes in distress while drooling, leaves a strong impression. The moment her plump, hairless pussy is penetrated looks slightly painful, yet it feels like a sign of her becoming a real woman. Filled with the uncle's white fluid, Monaka-chan is utterly satisfied. Through this first experience, new emotions arise as their relationship grows deeper.