Sully wants to hate Keating. He's been in love with Rodrick since they were kids, and he hates seeing Rodrick and Keating together. He never expected Rodrick to tell him he loved him back, or that he wanted the three of them to be in a relationship together.
Rodrick knows he's asking a lot from Sully and Keating, and he doesn't know if they'll ever be able to make things work. He just wants Sully and Keating to agree to give their relationship a chance--and they do.
But before they can do anything about it, Sully is shot by a human hunter. Will Rodrick lose one of the men he loves? Will Sully give up, knowing Rodrick won't be alone?