"I'm going to take care of us," he says, and Regulus is unable to prevent a derisive scoff from escaping. He feels a warm hand grip his chin, forcing him to look in to steely grey eyes, so much like his own, full of earnest hope and determination. "I promise." Sirius gets an unpleasant birthday gift and decides to take Regulus and run away. Non-magic AU feat. RB/SB.