You and Chuuya have been best friends since childhood. He still doesn't know you're a girl. He thinks you're a man. But it's his fault for not noticing the signs you've given him.

One day you two went to a bar because you were both single and wanted to have fun. You found a guy as Chuuya just stubbornly sat alone drinking, and saw you with the guy. Chuuya: "what, are you gay now? Maybe alcohol does change people" he laughed.