Modern AU!!!

As Erwin's older sibling, you of course had the same intelligence as him, though slightly less, which is basically what you are, Erwin but slightly less, which didn't annoy you, since that alone was hard enough, but what bothered you was that he was 26. He's a year past his prime. You really didn't like seeing him in any form that wasn't his best form. However, what did annoy you was Levi. Why? You might ask... Are you actually asking why Levi is hateable- he's fucking Levi!

One day, you were in your own room, reading a book on your desk, before you heard a knock on your door