Wolfstar

Wolfstar is a slash ship between Sirius Black and Remus Lupin in the Harry Potter series.

Canon
Sirius and Remus met at Hogwarts in their first year when they were sorted into the same house. They became best friends, along with James and Peter. In their second year Sirius discovered that Remus was a werewolf, and so he and the other Marauders decided to become Animagi to help him during the full moon. When they left Hogwarts, they joined the Order of the Phoenix together. However, they became aware that there was a spy in the Order, and Sirius suspected Remus. This led to him not telling Remus that he had switched places with Peter as Lily and James' Secret Keeper. When the Potters were betrayed, Remus (along with the rest of the world) believed Sirius was guilty. They were separated for twelve years during Sirius' imprisonment in Azkaban. Remus eventually discovered that Sirius was innocent when he spotted the supposedly-dead Peter Pettigrew on the Marauder's Map, and was reunited with his old friend. They both apologised for doubting each other, but had to separate again as Sirius went on the run. When Voldemort returned, they both rejoined the newly reformed Order and fought against Death Eaters together, including at the Department of Mysteries. Remus was extremely upset by Sirius' death.

Fanfiction

 * The Shoebox Project is a very popular Wolfstar fanfiction.