You become a citizen in Snowdin due to being lost in the undergrounds. You had left Toriel and the ruins only to be greeted by someone you would've never thought to be so important, or essential, to your life. *warning: might get serious and have adult content in some parts also maybe some spoilers for both the pacifist and the genocyde routes.

Yeah my account was delrted so today I shall start making a story about Gaster sans and the reader..might lead to smut so be warned