TW: suicidal thoughts mentioned

Personally I ship Wolfstar as a QPR. Biromantic-asexual Remus and aromantic-pansexual Sirius. Everyone says they're dating (romantically) and so they go along with it, Sirius leading and obviously Remus just has to accept it.
Remus tells Lily first: "she was there for me at a time when no one else was".
They had been dating in secret since fifth year, and Remus always felt guilty because of James. He then told her that he liked boys and girls and he was really confused and worried that Lily would hate him. She told him about biromanticism because she had already helped him work out that he was asexual. In sixth year she came back from summer holidays and told him about QPRs. James had had similar conversations with Sirius when he came to James' house looking like death.
In sixth year Sirius spends up until Christmas writing a book for Remus, saying everything he liked about him and every reason he was the best person in his life. The book ended in asking Remus to be in a QPR with him. Remus obviously agrees.
They are together until Sirius is arrested. Remus is destroyed and burns the book that Sirius had given him all those years ago.
When Sirius is revealed as innocent in book three Remus is obviously really happy. They live together (hence the joint present that Harry gets from them).
When Sirius dies in book five Remus is devastated. At one point he attempts suicide but Tonks finds him and saves him. She already likes him and eventually Remus finds a different type of love for Tonks. His love for Sirius never changes.
He agrees to have children for Tonks because she's always wanted a large family.
When they both die in the battle of Hogwarts and Remus and Sirius are reunited their love hasn't changed. They eventually just agree to have polyamorous relationship in the afterlife and everyone is finally happy.