Wishin' On Every Dandelion. A Sans X Reader

It's 2063, and the world has been consumed by technology, nature almost completely destroyed. Except for Mt. Ebott, where you live. While exploring a cave, you fall into a pit, and become trapped the Underground. While trying to get out, there's someone else who is trying to get out of all your resets, the pain they cause, and how they are slowly destroying him. You'll have to get out of there, and maybe love will stir up, too.