The nonchalant proposal and acceptance had me bouncing for joy, because all it would take in canon is that one moment where these two actually looked at each other and realized how much in love they are.

Yes, yes! That's exactly what I loved about this and I didn't realize it until you said it! The feeling that despite all of fandom's desire for a big romantic clinch, it probably would happen this way if it ever made it into canon: just the simple, happy realization that it's meant to be.

I stared at this prompt and couldn't figure out what I would do with it, but I love the way you did it! It makes me melt with joy.

(For some reason the idea of them "waiting until marriage" and anticipating it with delight is so hot and romantic!)