The work titled 'Brother, we're doing H things, it's a secret, okay?' prominently features the cuteness of the little sister role played by Marui Moeka. The story portrays the little sister as an angel cleaning up her brother's ejaculation, crossing boundaries between siblings. While there are adult elements such as cleaning fellatio and incestuous sex, the focus remains on Moeka's beautiful girl appeal. She looks great in her uniform, and her performance as the little sister is captivatingly adorable. As a piece centered around incest, it stands out as an excellent work that allows viewers to savor the cuteness of the little sister role, truly a masterpiece.