You and Sans been hanging out since you decided to stay at his place and you've both been pretty great around each other but Papyrus always jumps in from time to time...(Papyrus is a little kid at the time)

This evening you and Sans decided to chill and watch a movie... Until Papyrus came landing head first into your stomach in a surprise attack hug

Papyrus: "SUPPRISED HUG ACTIVATE!!!"