This is the product of wondering what Rose and Scorp would do if sorted into houses opposite of what their parents wanted. Somehow, the most logical thought was Harry being made messenger.
...I was half asleep at the time.
HP is not mine, gracias.
"Sit down, Ron."
The redheaded man looked over his shoulder at the man who had just walked in his backdoor. "I didn't know you were coming over today, Harry," he said. "And...why do I need to sit down?"
"You heard from Rose?"
"...no." Cautiously, he took a seat, suddenly dreading his best friend's news. Had the Hogwarts Express crashed? He didn't think it was possible, but muggle trains had crashed before and so he kind of worried about it sometimes. "What happened?"
"She sent me a tear-stained, terrified letter by owl last night." Harry looked at him, resigned.
Ron couldn't figure out what he was supposed to do or think. Why was his daughter sad and scared, and why the hell had she sent a letter to her godfather instead of him?
"She thinks you're going to disown her."
"Where on earth did she get that idea? What would I disown her for!"
"She's a Slytherin." Harry leaned against the wall, waiting for his friend's reaction.
Ron tried to process this, and his jaw worked like a goldfish for a moment. "...repeat that again, please."
"She was sorted into Slytherin."
He flopped backwards into the chair. "And she thinks I'll disown her for that?"
"You made a joke about it at the platform," Harry pointed out.
"Oh." He'd forgotten that. Shouldn't have scared his little girl like that... "Just one thing. Tell me what house Malfoy's kid is in."
"Scorpius is in Gryffindor with Al," Harry said. "Al told me, in his letter." He gave a crooked smile. "After this, I'm supposed to go break the news to Malfoy too. Scorpius, evidently, has similar fears to Rose."
"Can't blame the kid, with his family," Ron muttered, running a hand through his hair.
"I can't blame Rose, in this family, either," Harry admitted, grinning slightly.
"Can I see the letter, at least?" he asked, after a few seconds.
"Sure." He pulled it out of his pocket and handed it over.
Dear Uncle Harry,
I got sorted into Slytherin. There. I've said it. Al told me I could stay with you if Dad disowns me like he was threatening. I really hope he doesn't but I'm scared to tell him myself. If you wouldn't mind, could you please please please tell him for me?
It really isn't as bad here as everyone makes it sound. One of the prefects told me that she thinks Slytherin is actually closer-knit than the rest of the Houses, because all the other Houses hate Slytherin. But not everyone does. Dominique got sorted into Slytherin too, last year, remember?, so at least someone was super excited that I was there. She stood up and did a war whoop for me. I'm one of three girls in Slytherin. The other two are Flavia Goyle (she's a lot prettier than the Goyle Dad says you all knew, and she says it's because of her mother), and Miriam Nott (she has a replica human skeleton that her dad apparently got from a Muggle shop). Slytherins really aren't as mean as you've been saying. So far, except for my cousins and some of their friends, it seems more like the other Houses are awful. A Ravenclaw girl tried to knock Miriam over as we were leaving the Great Hall, and didn't even bother to apologize. But I think Victoire saw her, so she's probably going to get in trouble, I hope.
Love you and Aunt Ginny and Lily and all,
Rose Weasley
"Goyle had a daughter?" Ron's eye twitched.
"With Daphne Greengrass, apparently. At least the children are inheriting her looks, I suppose."
Ron shook his head. "The idea that he could even have...Merlin, I don't want to think about it!" He shuddered. "I'll write her a letter, then. Just...what am I supposed to tell Mum and Dad?" He looked at Harry, and an idea formed. "You know, they really do like you a lot, you might have noticed. Could you-"
Harry nodded, and sighed. He really hoped Hugo didn't get into Slytherin, if only to save him from being the bearer of all news. "After Malfoy, I suppose."
"Thanks a million, Harry."