The Power of a Memory

Sirius Black, Millionaire, Playboy, Wizard, Philanthropist, one of the most dangerous Aurors and hitwizards that the Ministry of magic has in it's arsenal. What happens when he comes to find that his best friends are dead, he hears that Dumbledore has a plan and goes with it until something sparks a memory, a simple happy memory, now Sirius Black will do the Unthinkable, disobey...