(ABO) A Match Made in Heaven

As a child, Madara Uchiha met a gloomy watermelon-headed boy. When they grew up, he fell for that boy. At first, Madara Uchiha thought that since he and Hashirama were both alphas, they were destined to never be together. But so what? Only an alpha as strong as Hashirama, someone who could stand shoulder to shoulder with him, was worthy of him. So what if it went against convention? Whatever Madara Uchiha wanted, he would get. Then he found out that Hashirama Senju was an omega. Ha, Madara thought, Hashirama and I really are made for each other. As for everyone else in the ninja world... Heh. An omega who can beat every alpha in the entire ninja world is someone only you, Madara Uchiha, can take in.

This story is also called: The Omega Who Taught the Entire Ninja World a Lesson