[Tywin] frowned. “I have felt from the beginning that Stannis was a greater danger than all the others combined. Yet he does nothing. Oh, Varys hears his whispers. Stannis is building ships, Stannis is hiring sellswords, Stannis is bringing a shadowbinder from Asshai. What does it mean? Is any of it true?” - A Game of Thrones

AU where stannis crowns himself king immediately after robert dies
and waits for no shit, thereby crowning himself before renly has the chance to; dragonstone and many stormlands bannermen rally under his banners;tywin lannister meets him in open war for the throne