Sirius dropped his hands and chewed on the inside of his lips. "I don't know what happened to us, Rem. I'm sorry, mate, all right?"

He slowly moved his large hand to rest on Remus's shoulder and squeezed.

It was obvious that his emotions, like James's and even Severus's, were effected by the young wolf, coming of age, moving to adulthood. It was impossible not to be affected. This was a volitile time in a werewolf's life. And Remus did not really have a pack, just some animagi boys to follow him around.