My girlfriend, who derives pleasure from having her throat manipulated, secretly engages in forced oral sex and intercourse without my knowledge. (Arisu Mai, DASS-439)

The younger brother's girlfriend, Mai, is a submissive woman whose deep-throating urges are noticed by her older brother, Yuichi. Yuichi stares at Mai and gently approaches her. One day, Mai accidentally spills tea on Yuichi and stains his pants, so she apologizes profusely. Yuichi mischievously orders her to wipe her genitals. Another day, when Mai comes to apologize again, Yuichi mischievously orders her to say, "Gently stroke my little brother."