It is a sweet story.
I like a lot the reaction of Kurt at the Sebastian proposal.

Aww, this was really great and cute! I loved how beautifully mundane it was, not focusing on the drama but on the little things. I loved it!

Aw! They are so cute!

That was amazing, I loved your writing and the characterization of Kurt and Sebastian. It's really well done! (And cute that they even argue about how to propose to each other)

XO

Lyak

It was amazing! Thank you very much!

I could so see this happening, loved it.

I'm not usually a fan of Kurt/Sebastian, but I think you did a wonderful job with this. The characters worked well together and you did (as you mentioned your concern) certainly do the characters justice. :) Great job!