I do not think it happens often, though you hear about it from time to time. People that meet online and then form relationships? Sometimes they become just friends, but sometimes it blossoms into something more than that.
In this case, these two adventurers decided it was best for them to never be apart on their journey.
From their first outing when Eorzea was still so new and untouched by other such adventurers:
To their first hecklers, standing around the aetherytes and nay-saying or preying on the weak and innocent:
Even to their magnificent fights with notorious monsters that spanned all over Eorzea:
They have already traveled so far, and overcome each challenge presented before them alongside meeting other friendly adventurers to venture with too.
But after the battle is won, they always find comfort at the end of the day in the company of each other.
A new age is approaching, and we will fight to make it ours too.