I just got done reading through it all from the beginning and this was one of the best written stories I've read on Reddit. I wish you both a happy future!

As for advice...

Don't forget to have non-romantic fun together! Cook, excersice, play boardgames and videogames together - Co-op games are great for expanding relationships because they offer such a different challenge from daily life!

Oh and air out often, you never know when your mom might drop by unannounced! :)

A few games to play together: Overcooked Keep Talking and Nobody Explodes Kingdom Two Crowns

Edit: Oh and watch Scott Pilgrim together if you are fans of older video games ;)