[Noukyuu] Changeling (ENG)

Took me a couple go throughs to get it. At the end, it seems the two switch places willy-nilly with the brother unaware that he had actually been screwing his sister. Shao likes the sex parties and considers them to be fun, Makoto was a "prude" but had wanted to have sex with her brother. Shao gets to improve her Japanese while pretending to be Makoto while Makoto gets to fuck her brother without his knowing that it's his sister. It's a win win for both girls, even though Makoko didn't want it at the start.