YaoiLover's manga / #twins(8)

Natsuki has always had a crush on his tutor, Ryogo. Even when Ryogo eventually marries Natsuki's sister, Yukiho. Years pass, and the couple has twin babies. However, Yukiho comes up missing. We don't know if she abandoned her family, as Ryugo claims, or if Ryugo killed her! Despite knowing his sister is missing, Natsuki agrees to help Ryugo with the babies, and even cross dresses as his sister to hide the fact that she's missing!