Ruins (Sans X Alphys)

The Underground wasn't built in a day, but it fell in one. Monster after monster turned to dust as the Human fulfilled their bloodlust. From the weakest to the strongest, from the most kindhearted pacifists to the mightiest warriors, from the queen to the superstar. Beginning to end. But in the end, the only one left who could stop the Human was the one who had nothing left to fight for. Sans' victory was an empty one. His brother was dead. TORIEL was dead. Undyne was dead. Everyone he knew was dead. Alphys' story was a similar one. When the Underground was saved, she didn't see it that way. The Underground had lost it's spark when Mettaton fell, and she had lost hers when Undyne did.
In the end, it was the two weakest monsters in the Underground who were left for each other. In a world with nothing left, they pulled each other from the brink.
SO LET'S JUST GET THE BLOODY SHIPS GOING, EH?