Hitozuma no Kakushigoto

Note: Originally serialized under the title Mama-san, Yobai wa OK desu ka?: Zetsurin Gaikokujin no Gokufuto Chi●po ni Nandomo Iki Aegu (ママさん、夜這いはOKデスか?〜絶倫外国人の極太チ●ポに何度もイキ喘ぐ). Later received a tankoubon release under the name Hitozuma no Kakushigoto (人妻の隠シ事).