@matrix there's nothing better than having your sibling as a lover.
You already know their tastes and preferences since you've been around them since birth, chances are you two have the same preferences in food and other stuff since you grew under the same household and you don't have to go through awkward and time consuming dating to find them since they're already in your family. What's there not to love?!
I'm the joke, but you're the punchline.
I run this website. I like posting funnies and fugging lolis.