Harry Potter and the Order of the Phoenix
"[Harry's]'s not your son," said Sirius quietly.
"He's as good as," said Mrs. Weasley fiercely. "Who else has he got?"
"He's got me!"
"Yes," said Mrs. Weasley, her lip curling, "the thing is, it's been rather difficult for you to look after him while you've been locked up in Azkaban, hasn't it?" (5.124-127)
"If my parents could see the use their house was being put to now ... well, my mother's portrait should give you some idea ..."
[Sirius] scowled for a moment, then sighed.
"I wouldn't mind if I could just get out occasionally and do something useful. I've asked Dumbledore whether I can escort you to your hearing – as Snuffles, obviously – so I can give you a bit of moral support, what d'you think?" (6.187-189)
"You belong at Hogwarts and Sirius knows it. Personally, I think he's being selfish. [...] He'll have company!" said Hermione. "It's Headquarters to the Order of the Phoenix, isn't it? He just got his hopes up that Harry would be coming to live here with him."
"I don't think that's true," said Harry, wringing out his cloth. "He wouldn't give me a straight answer when I asked him if I could."
"He just didn't want to get his own hopes up even more," said Hermione wisely. "And he probably felt a bit guilty himself, because I think a part of him was really hoping you'd be expelled. Then you'd both be outcasts together." (9.62-66)