Remus/Tonks
I can't say I'm entirely surprised, knowing you as I do. It was the same with me. After everything we'd been through, it didn't feel right letting others take all the risk. Knowing that our being there might save other lives.
I'm heartbroken that Teddy grew up without us there, but I can only hope that he understood why we made the choices that we did. So he could grow up in a better world than we did.