[Chinese]ZUKO-098 My serious sisters got influenced by our relative's gal and now they're making babies

Living with diligent and well-behaved younger sisters. However, the peace is shattered when a cousin who is a gal comes to stay. She imparts various erotic knowledge to my sisters, and they end up respecting her completely. Now, I have to endure outrageous demands from this gal and my four sisters, such as showing them how to masturbate or role-playing a brothel in the bath. Because you were fundamentally serious, once you become perverted, it's impossible to control these girls... I wish you good luck.