Sirius licked his lips, and tried to assume a reassuring smile, "Yes, we did - he said that Severus is doing everything within his power. He said that he’s working under the advisement of St Mungo’s - he said he didn’t want to start pulling you out of school at such an important time. We all want you to succeed with you OWLs, don’t we?" as he spoke, Harry’s heart sank lower and lower in his chest. Sirius knew something. He couldn’t say what, but he knew  something. Did he know that Harry was a horcrux? Did he know why it was so vital for the wound on his neck to heal? And if he did know those things, why was he was hiding it from Harry?