Underswapfanfiction Stories

You have lived in the underground for 4 months now, and had befriended the most adorable cinnamon roll ever, Sans. However, you couldn't help but to gain feelings for hi...

Mage is a skeleton monster living in Spirit Town. A human child named Chara finds an ancient spellbook and summons him. How will Mage deal with this new environment? He'...

As usual, Sans comes back from training, happy and excited, except this time, he arrives home 'marked'. Papyrus is not pleased, until he finds the creative little secret...

This story is about me falling into the Underground and meeting the characters of Underswap, specifically Underswap Sans. We soon find each other having a lot of things...