As he clutched at Harry, a part of Remus Lupin wanted to believe that what Harry was saying was true. And that Sirius would come out from under the veil in front of them. As though a knife had been plunged into his chest, the pain got worse with each passing moment that Sirius left them waiting, until eventually, Remus was forced to believe he had truly lost his best friend, once again.
After a distraught Harry had broken free from Remus' pain filled grasp, Remus fell to the floor in aguish, unsure whose arms came around him, trying to comfort him. This only made the pain worse, as Remus recalled the other times he had needed this comfort, it had been Sirius to deliver it, and now, Sirius was the reason he needed it.
Feeling empty, Remus stood up in the Department of Mysteries, and walked to an empty space, he apparated, landing on the doorstep of 12 Grimmauld Place. Upon entering, Remus expected to see Sirius bound down the stairs, happy for human company. Instead, Remus faced a desolate hallway, with paint peeling walls and a large portrait of the woman who had made Sirius' life hell.
Ignoring the sudden urge to curse the portrait, Remus climbed the creaky stairs, until he reached the floor hosting Sirius' bedroom, a room Remus had been in only once before. The familiar photo of the Marauders lay on the wall. Remus stood and watched as he and his three friends waved from the picture. A small tear rolled along Remus' cheek, down his chin. Eventually, Remus turned away from the photo, and sat on the edge of the bed, next to a small chest of draws.
The permanent locking charm that Sirius would have placed upon it, had gone, meaning Remus could open up the drawer, and view its content. A small glass mirror lay along the base of the drawer, under quills and stray Beans. Remus, of course, knew this mirror could communicate with its partner, though he wasn't sure where its partner lay.
As he went to replace the mirror, Remus caught sight of a small white envelope, that had hidden beneath the mirror. Pulling the envelope out, Remus glanced at the photo of he and his friends once more, wanting to see Sirius' smile, and wondering what Sirius would say, had he known that Remus was looking through his drawer.
The drawer slid shut quietly, as though waiting for the envelope to be removed. Remus turned it over curiously, and was startled to see that his name was written on the other side, in the familiar scrawl of Sirius' handwriting. Nervously, Remus began to open the envelope. A letter and a photo fell out of the envelope, and Remus hastily picked them both up.
He placed the envelope beside him, and crawled to sit up on Sirius' bed, leaning against the familiar scent of his friend. His knees pulled up to his chest, Remus began to read the letter.
'My Dear Moony,' the letter began, tears were already falling down Remus' cheeks as he breathed in his friends scent, and read the letter.