A petite yet mature and charming older sister and her apathetic younger brother are featured in this story. The brother is currently job hunting, while the older sister kindly supports and takes care of him. As part of a project to strengthen their family bond, they begin by discussing their favorite foods, then gradually progress to more intimate questions like "Do you have a boyfriend?" and "Have you ever kissed someone?", eventually leading to grinding. The sister doesn't know much about what her brother likes, yet clearly views him as "a troublemaker, but still my precious little brother." Notably, the brother actively encourages the erotic conversation. When the staff suggests grinding, the brother enthusiastically responds, "With this money, I won't need allowance for a while—let's do it!" Though hesitant, the sister agrees, saying, "Just keep this a secret from Mom, okay? Promise me you'll work hard to find a job after this." Grinding begins! The brother is visibly excited watching his sister move her hips while still in underwear. He says, "Isn't your panties in the way? I'll take mine off too," and undresses. During their chat, they mention it's the first time like this since they used to bathe together, and the sister is flustered by her brother's now-large cock. As the brother takes the lead, grinding against her, the sister begins to feel pleasure. Accidentally, he slips inside—she gasps in surprise, but he doesn't stop, pleading, "It feels so good inside you, Onee-chan. Just today, please!" Despite protesting, she ends up cumming. A slick, bareback penetration follows! The brother looks deeply satisfied finally having sex with his long-desired sister. In the end, he erupts inside her with a creampie. "Hey, you came inside, didn't you?" the sister says, exasperated. Yet, ultimately unable to resist her adorable little brother, she forgives him with a soft heart, saying, "This is only for today… but promise me you'll get a job starting tomorrow."