Rina Takase comes to care for her older brother who's lying in bed with a cold. When he wakes up, he notices his sister leaning beside the bed. A pleasant, elegant scent lingers around her, and he unconsciously inhales the fragrance of her hair. In that moment, he catches a glimpse of her cleavage, pulls out his cock under the blanket, and begins jerking off while sniffing her scent. When Rina opens her eyes and notices what's happening, her brother is too stunned to move. Unable to explain himself, an awkward tension fills the air—yet an unexpected turn of events unfolds. Rina says, "I just broke up with my boyfriend, and you're a guy after all, so this kind of thing happens. Just this once, let me help you finish." Too embarrassed to look him in the face, she reaches under the blanket and starts stroking him. As arousal builds, he pushes the blanket aside and exposes his cock. Though flustered, she doesn't stop. When he still can't cum, he asks to touch her breasts. She lets him, but he still doesn't reach orgasm, so she tries a blowjob. Still nothing—so he asks for cunnilingus. With a resigned sigh, she takes off her skirt and panties, flipping into a 69 position. Even then, he can't cum. Rina suggests, "We're siblings, so we can't have sex—but we can rub against each other. Just finish like that." An unusual night unfolds, as the bond between brother and sister takes on a new, unexpected form.