Snape and Harry engaged.
I'm looking for a fic where I believe that Harry lives with the Weasley before Hogwarts. I know that Severus and Harry are engaged or betrothed but that most people don't know that. I know that in the story Ginny is in love with Harry and at Christmas asks him to marry her. But he is already engaged to Severus. I believe the story was on HP Fandom.