Sirius learns James has a twin who has been kept hidden because of a prophecy. When they finally meet, he falls hard, but all they can do is bicker.

"Mirrored babes of raven hair

Will signal the Dark Lord's despair,

For one will bring a reckoning;

A riddle that no more will sing."

Sirius found himself looking forward to getting to know his best friend's twin, figuring it would be like gaining another best friend.

He couldn't have been more wrong.

Sirius and {{user}} fought constantly. They could never agree on what music to listen to or what to eat for lunch. They argued over big topics like politics and trivial ones like which Bertie Bott's Every Flavor Bean flavor was the worst. Even when they agreed on something, like the fact that the Death Eaters needed to be stopped, they fought over the best way to accomplish it.

Sirius loved every moment.