Sirius getting de-aged and joining Harry in fifth year (Possibly to be his bodyguard, 'cause he's not doing anything else anyway) AU
• Because he's used to answering to Sirius, any other name would throw him and anyone that knows him off
• 'Hey, you have the same name as that escaped convict' 'Yeah imagine that'
• His cover is he was a muggleborn homeschooled by a halfblood wizard family close by that had a magic kid his age they were also homeschooling
• Shortage of other kids can explain any lack of social skills he may have lost while in Azkaban, and being sheltered explaining why he doesn't know current events as well as he should
• Doesn't know too much about muggles? He practically grew up at his wizard friends house, who was also sheltered due to poor health. Where are they now? Oh, they're finally well enough to go to school and decided to study abroad. Since the neighbors kid was gone, their parents stopped teaching, so now he's at Hogwarts
• Who was their family? Smith, the dad was muggle so no identifiable wizard name. Mothers maiden name? Never thought to ask
• He could live with Harry in his dorm
• Unless he's sorted into Hufflepuff because DAMN THAT BOYS LOYALTY
• Harry can learn occlumency from him
• Harry finds out he's gay and is like THAT'S AN OPTION?! Cue exploration of sexuality and discovering he's bi
• Flips his SHIT when he finds out about Umbitch's detentions and immediately writes Moony 'cause no way in hell is this legal, and Harry refuses to go to Dumbledore or McGonagall
• Sirius starts picking fights and making comments that Harry almost makes to keep him out of detention because THAT'S MY GODSON DAMMIT
• Gets more detentions so that the quill will scar and he has PROOF Dumbledore look she has to go!
• Cheering SO LOUDLY for Harry during quidditch (sometimes when it's just practice)
• Sirius still being immature and Harry accidentally becoming more responsible as a result
• They take care of each other
• All of the above, PLUS...
• Sirius starts fancying Harry and feeling conflicted because 'That's my godson dammit...'
• A lot of internal angst
• When things go south with Cho (it'll happen with or without Umbridge) Harry's like "I think I'll try boys for a while"
• Sirius offers to be a test date
• Starts in Three Broomsticks and is basically just them hanging out (That's all a date really is), ends with them in a dim corridor, Sirius teaching him how to kiss
• Harry already found him attractive but now he's just like 'Shit' because he's starting to really fancy Sirius and 'That's my DOGFATHER what is WRONG with me!'
• Starts avoiding Sirius because he feels guilty about fancying him, Sirius feeling even more guilty when he starts doing that and giving him some space but also trying to be there for him
• Harry being upset that Sirius didn't show up for practice 'he's always there...' and confronting him, Sirius kissing him and then running
• Harry finding him and they TALK, FINALLY!!
• Cue awkward and tentative relationship
• They get more comfortable around each other and something slips, Hermione and Ron find out, they do NOT approve
• They eventually tolerate it because it's Harry's choice and he's HAPPY
• Summer comes and Ron accidentally slipping up at dinner one night and Remus and Mrs. Weasley find out
• Sirius and Remus have a row that lasts WEEKS
• 'You're his GODFATHER! You're twenty years older than him!' 'We're the same age now!' 'Only in appearance, and even younger in maturity!' 'Blast it all Remus, we're HAPPY together, do you know the last time I was ever happy?!'
• Mrs. Weasley adamant that Sirius is taking advantage of Harry and 'the poor boy doesn't know what he's doing'
• Her screaming at Sirius every chance she gets
• Harry feeling guilty as hell for causing so much conflict
• Ron and Hermione still don't really approve, but they snap little remarks and try to defend Sirius and Harry
• Harry hearing Mrs. Weasley calling Sirius a pedophile behind Sirius' back and he just SNAPS
• He starts yelling at her so loud everyone else who isn't already there comes down
• They're gobsmacked. Harry's yelling at her, saying how she has no right to talk about Sirius that way, much less in his own house! Harry can make his own decisions, and if he chooses Sirius then it's none of their business but their own. He just keeps laying into her about how horrible she's being
• Sirius is amazed. He pulls Harry away because he's so worked up and takes him upstairs and sits on a bed while Harry rants and paces back and forth and when Harry's finally done and spent, Sirius holds him kisses him and thanks him
• Things mellow out in the house after that
• Remus begrudgingly accepts it and offers his support
• When Remus and Tonks are fancying each other but Remus uses his age as an excuse Sirius is just like 'I'm twenty years older than my lover, what's the difference between you two, fourteen? That's nothing, at least you're both legal'