I think the question is so far out of left field that it's just dumb. One does not usually go from "I have no idea what I'm doing" and "nor have I" straight to "Let's get married." At least not without stopping for at least a little while at "you know, we've been together for a while now and I've been thinking...."
Seriously, someone expects that, faster than existing relationship that have had a year or so to get used to thinking of each other as romantic partners?!
Pretty much every couple in the comic is more likely to share a marriage proposal before Faye & Bubbles. Just because every one of those relationships have had more time to grow into their current forms and stabilize. I mean, sure, they could go first - but it could be decades down the line and entirely different couple pairings, before *ANY* of the cast takes the step of marriage.
I mean, seriously, where did this question even come from, in the very same week the characters moved from friendship to romantic partners, and why haven't we had similarly instant threads on the same topic about literally every pairing that's ever happened in the comic???
Did people immediately start asking about Faye & Marten getting married? Marten & Dora? Dora & Tai? Marten & Claire? Steve and Cosette? Marigold & Dale? Seriously, every couple in the storyverse has done just as much to prompt this question (ie, they decided to start a relationship...), so why jump on it but only now?