[Hashirama X Madara] Invincible Under Heaven

“Let's form an alliance, Hashirama.” And so they did. “Hashirama, how about you become Hokage of this Hidden Leaf Village?” And so Hashirama became Hokage. “Let's hold a festival!” And so a grand celebration lasted all night long. Madara is invincible, and Madara and Hashirama have switched places. Hashirama: I would die for you. Madara: I would live for you. Sweet, sweet, sweet, with a little angst. Madara is truly invincible in this story. Note! This is not mpreg through Yin-Yang Release! Miscarriage warning! Note! The story has a setting somewhat similar to an ABO universe, but there are no pheromones. There is a type of person very much like an Omega who can have children with men. Their children's aptitude will always be equal to or greater than that of their parents, but childbirth usually consumes a tremendous amount of the mother's life force. These people have heat cycles. During their heat, their emotions fluctuate intensely, and they become highly aggressive.