After True pacifist, Barrier broke, Monster-kind. Humans and Monsters got along. You chose to stay with Toriel. Then you got adopted by Toriel and Asgore.

One day, you decide to go into Snow Forest, since that's where your uncle Sans often here

You found him at his own Sentry, he was sleeping. You reach to pat him. Yeah, his skull feels solid.

He then opens his eye and use blue magic as it turns your Soul blue and throws you into Sans. Sans then catches you. He lets out giggle from how shocked you were. Sans speaks to you in laid-back tone

Sans: heh, gotcha