[SE] we've got each other

Ophelia

I'll be yours until the sun no longer shines
until the poets run out of rhyme

Ophelia is told to hold on, so they merely continue to tap the edges of their shoes together in a rhythmic thunk of rubber as they wait, not bothering to move or stand just yet. Why bother? Perhaps the stranger will find they can in fact do nothing, and then Ophelia will have moved from their very comfortable spot for no reason.

A few minutes past in which Ophelia begins to hum from the bottom of the hole, enjoying the way the sound bounces around in the narrow, tall space. Likely because it once was a well, it reminds them of a wishing well even now. Only to be interrupted when the stranger returns with a rope, which they throw down immediately - landing straight on Ophelia's chest and prompting a comical oof.

Blinking down at it, they reluctantly abandon their comfortable position to stand and take up the rope. "I think I can climb most of the way," they reassure, so the stranger doesn't have to pull if they're not the strong type. Leveraging their feet against the side of the well, Ophelia begins to climb until their head is just free of the hole - then they look at the stranger for help with a smile. "Can you pull now maybe?" Just enough to get Ophelia belly-down on the grass so they can fully free themself.

until the mountains crumble into the sea
In other words, until eternity