If Ronarry happened after the books
But I haven’t written a scenario for if they got together AFTER the war. So either Hinny and Romione were not a thing, and the only romances Harry and Ron had were each with girls back in Hogwarts (Cho and Lavender respectfully.) OR Romione broke up but it was actually super amicable and they are still best of friends, and maybe Ginny and Neville together instead (during war at hogwarts the two got close.)
I definitely feel like Ron and Harry would be ridiculously clueless for a while. I think it’d be a gradual build up, like it usually is when you turn friends to lovers. After Hogwarts I can see them living together, and then also working together in Aurors- always joined at the hip- and no one really thinks of them as a couple because society is heteronormative- but they are very domestic, much more so than just two dudes living together.
It’s the little moments that Ron and Harry bond over, and at night when plagued by nightmares, Ron is there to hold Harry as he always has, and Harry is every bit as there for Ron when he’s having trouble falling asleep after a mission. Their physical intimacy starts increasing in these moments, and they find at home it’s hard to stop from budging up next to one another at night, touching eachother’s hair etc. They fall into it so gradually they don’t really realize it. It’s just natural, and what they’ve always done, right?
Hermione starts to pick up on it a bit, and George and Ginny tease them a bit. Ron and Harry are very clueless, of course, and don’t really see why they’re getting teased.
I think that Ron would be the first to realize he likes Harry as much more than a friend. Who knows, maybe just one night when he’s taking care of Harry he just gets it in his head how nice it would be to kiss him and touch him, and Ron is in shock with where his mind has gone. Then it’s like a damn has been broached and he can’t stop thinking of Harry that way. He would do everything he could to not give anything away- he doesn’t want to mess up their friendship. Things are perfect. And Harry’s practically family- if things got messed up between them it could literally ruin Harry’s family life.
I think he’d open up to Hermione about it, and how worried he is. (I see them being able to talk more openly about things like this- even more so since you’d remove that romance issue that kept them from being able to communicate.) She’d concur it’s a risk to open up about it- but sees they obviously care about one another a lot and it could very well be romantic and perfect. Ron loves that fantasy but is certain it wouldn’t be able to be more than that. There’s no way Harry would possibly love HIM. He decides the risk isn’t worth it and might try to distance himself a tiny bit from Harry, possibly even date in order to distract himself from it.
Harry notices the change in Ron of course, and is a little hurt noticing how distant Ron is being. Harry hasn’t even thought about dates since the war, to be honest, it’s not something he’d needed. He was fine with his life as it was… him and Ron, being able to just be together, and laugh, and hold each other and he felt so fulfilled- and that’s when he realizes it. He didn’t want to date anyone because he was practically dating Ron. Like, apart from kissing and sexual stuff- they’d done every other part of a relationship for years. And he was going to lose Ron. He’s super broken up about it, and feeling awful.
He’s hanging out with Hermione, Neville, Ginny and Luna one night- and they ask where Ron is- he has to confess that Ron’s on a date- and can’t keep the bitterness out of his voice. Luna says ‘I thought you and Ron were lovers, though. Or is it an open relationship?’
Harry splutters at this, and then he says they’re not together. And the other just look at him like ‘oh honey… are you ok?’ And Harry, for once in his life, opens up and says no. No he isn’t. He’s actually really hung up on Ron and everything is going to change when Ron moves out and dates someone else and he’s scared shitless. Hermione can’t just all out tell him Ron feels the same way, as Ron has said so in secrecy. She tells Harry he should tell Ron. Harry is like ‘no way!’ but she finally convinces him to- and the other three are super supportive and he’s like ok! I’m gonna do it!
And they leave- but he’s so nervous he has to have a drink to bolster his confidence- one drink turns into a few more- and Harry bi-sexual disaster Potter is a lightweight- so he’s pissed drunk by the time Ron comes home, and is sick in the toilet from it. Ron is taking care of him, and he tells Ron he loves him.
‘Yeah, love you too mate,’ Ron says, trying to be casual, as he has Harry leaning against him, and Ron’s ushering him to bed.
‘No. no’m IN love with you,’ Harry slurs, barely concious at this point. ‘You smell good… Wuzgonna tell you… You’re beautiful… Wanna sex you up… Get married… Kiss you all the time.’
What a fucking disaster. Ron loves him so much and just chuckles at the drunkass hero of the wizarding world confessing he loves Ron Weasley.
‘I’ll see you in the morning, Harry,” Ron smiles fondly.
“No stay, wanna cuddle…” and even though Harry smells awful, Ron kisses him on the forehead and stays.
Next morning is a bit embarrassing for Harry- and there’s the awkward- ‘did you mean that? Yeah… Yeah I did’ conversation- but then they’re together and it’s perfect.