Original work: Bitch Onee-san VS Dutei Futanari Reiju Aoiike OL's great voyage: [Kasuga Mayu] Bitch girl vs Virgin Futanari Lady (Futanari ♥ Sex!! 4) [Chinese translation] [DL version]
[Kasuga Mayu] Bitch Onee-san VS Dutei Futanari Reiju Bichi OL vs. Virginity to help her daughter (Futanari Secrsse!! 4)