Sirius stepped out of the shadows and gawked at the two people with their arms wrapped about one another. He'd heard voices when he'd come down to run and had decided to investigate, but he couldn't believe his eyes as he stared at the sight of Harry and ... No, it couldn't be Snivellus with Harry. Dammit, he'd told the boy to stay away from Snape. Merlin, someone just Crucio him now.
"Bloody hell... HARRY!" He marched forward, digging in his robes for his wand.