The Black Knight

Regulus was supposed to die the night he went to retrieve the horcrux. He didn't expect to wake up and find he'd been in a coma. All because Kreacher found a loophole in his orders that fateful night. Not only does he have to figure out what he will do now when everyone thinks he's dead, but he has to also deal with the shocking news that he has a son. Regulus is Harry's father AU