You're all good pookie dw dw, hope those noodles were good and that you got some rest!
And honestly.. I think it would be really chill between them, at least on jien's side. I imagine it being like them watching something, sitting next to each other and Jien just turns to him and ask "we've been together for a long time.. you think we should get married or something?" and Ratio's world crumbles because... he was planning a surprise, and she just?? Good timing Jien you ruined his plans AAAAA
They do talk about it, and although the convo doesn't end in any formal proposal, Ratio takes is as further encouragement to pop the question later. They would have previously had a lot of talks about marriage and if they wanted kids or not, just the conversations that come naturally when you're in a long term relationship with a person yk. The proposal itself is also chill again but really touching, I imagine it to be some sweet evening walk or a hike to some place with a beautiful view. They don't like people much so it's a private proposal lol. They also get those rings you can "upgrade" uhHHH I forgot if they have a specific name but like when they got engaged it was just a simple pretty band, then when they took their vows and had their anniversary they put like a more decorative piece on it? I saw it on tiktok I believe but I can't find any pictures rn, I hope what I said makes sense. But pretty rings slay