In the narrative "The Sleazy Family: Sleazy Mother," the character identified as Miuuki (likely a misspelling of Miyuki) serves as Masaru's aunt. She summons Masaru under deceptive circumstances, asserting a need for errand assistance while intending to initiate a sexual encounter. This interaction proceeds uninterrupted until Masaru's stepmother—Miyuki's sister—discovers them and participates, escalating the encounter into further sexual activities among all three. Miyuki is established within Masaru's family structure and actively engages in the familial sexual escapades depicted throughout the series' three short stories. Her actions directly instigate the involvement of other family members, positioning her as a narrative initiator.