Who Is Actually The Worst Sister?
You wear your sister's clothes more than your own and growing up, you always tried to get her into trouble. But she probably knows by now that when you call her "the oldest, smelliest egg in the world" you mean it with love.
Growing up, your sister tried to convince you you were adopted and was always the one initiating fights. There wasn't much you could do to defend yourself when she was literally sat on top of you. You probably got to use this to your advantage when you realised how much you could secretly get away with.
When you're good you're good, and when you're bad you're bad. You send each other ugly selfies and tell each other every intimate detail of your lives. You and your sister are perfect sparring partners.