[Anime Crossover] Big Brother Is a Demon!

What happens when the chuunibyou, lovesick, down-on-his-luck Uchiha Obito gets an impossibly cool, domineering big brother... Obito: My first love, my best friend, my teacher... Big Brother, please spare me! What happens when this big brother successfully charms Madara and becomes the true mastermind behind the Akatsuki... Akatsuki: Lord Tobi, may your virtue and martial prowess reign for millennia, and may you unite the shinobi world! What happens when this cool, domineering mastermind mercilessly wreaks havoc on the shinobi world... Everyone in the shinobi world: Merciful Sage of Six Paths, please take this monster away! Sage of Six Paths: No problem! ο(=?ω<=)ρ⌒☆ And then the cool, domineering big brother returns to his original world... Sebastian: Brother, you're still alive? Big Brother, exuding authority: Don't call me Brother. Call me Big Brother! Ciel: Welcome back, Big Brother~ Big Brother, blushing and covering his face: Oh, don't call me Big Brother. Just call me Onii-chan! O(∩_∩)O~ This story has no shame and no limits, and turns the original story on its head. For instance, AB let Hashirama and Madara, Sasuke and Naruto, end up as brothers instead of lovers. But foolish little me, the author, can absolutely let Hashirama and Madara, Obito and Kakashi, Sasuke and Naruto, and Sebastian and Ciel end up together. I have to give myself a pat on the back for that! This story is a total derailment. If that's not your thing, please move along! No ranking spoilers, please!