Sirius wakes up only to find the bed empty and Remus plotting against him. (not beta-ed)
Remus joins a LGBT organisation
On his 57th birthday Remus is more aware than ever of the fact that he's getting old and his fears come to the surface. Sirius is there to comfort him. Sorry, this summary is really bad. Rated T for small mentions of sex (just to be safe).
James and Lily are dead, Sirius is in Azkaban, Peter is presumed dead and Remus is all alone and write one last letter to Sirius that he'll never send.