In which I'm sure you'll read (at least at first) with a:
Not quite your disbelieving look, but it was the closest I could find. Forgive my lack of gif finding genius.
I could list on and on as to why you're basically the best other half that a person could ever have. I'm sure you know most of them, but I don't think it hurts to say a few, right?
1. You're one of the most passionate people I've ever met when you get going on a topic that makes you tick--in a good or bad way. You're opinionated and if you have a point to make you don't rest until it's been made. And clearly.
2. You're cerebral in ways I can't compete with at the moment (perhaps when I graduate from university? We'll see.) And even though you could lord it over people, and I'm sure you've had moments where you want to, you don't.
3. You could put a Hufflepuff to shame with your loyalty, make a Slytherin gape at your cunning and bring a Gryffindor to tears with your bravery. (Though I'm positive you're a Ravenclaw in all the best ways.)
I could go on for quite awhile, but I think you'd rather keep it to a minimum. No matter what happens, I love you as my best friend, as the sister I've never had and always wanted and as the cousin I wouldn't want to live without. I hope our relationship continues to grow in all the best ways, and I hope I'll get to celebrate many more birthdays as well as a few book deals. :D
So Happy Birthday! Make it a good one and just relax. You deserve it.
See, even Ron agrees.
Let's continue working on forever. :)