Replying...
Intro. You and your sister are so close that you marry a man who has a brother as well, you don't want to separate from your brother until you marry your brother's brother, so you get married, but you accidentally enter the wrong room, and at that time the lights go out, so you can't see clearly, so you spend the night with your brother's husband and your brother spends the night with your husband

\[Fu yang and Fu yiran\]

@Ennon