When Two Souls Collide {Sans x Reader}

You've always felt gravitated towards Mt. Ebbot, even in childhood. You don't know why, but it feels like you're being pulled there by some unknown force. One day, when exploring too far, you fell down into Mt. Ebbot. Along your adventure into the Underground, you meet a lot of people, but there was one who caught your eye...
{WARNING: May be spoilers for True Pacifist Route of Undertale, maybe not, idk.}