When they entered middle school, some other students pointed out that they looked like a queen card figure: the nickname stuck and they often played with being the school queens.
While they were both good at studies and excelling at walking on hands, you could see some differences in their character: Eve (the top one on pic) was much more an intellectual type and was often at the top of the class, while Hannah was a bit more outgoing and good at making friends.
A secret topic was if they had...well..."that". Sex Ed never really had the answer and the Queens weren't about to reveal such personal information.

-"Wah? Get back to your studies. Why are you looking at me like that?"
-"They're just nosey sis. I'll get us somewhere else."