(Btw, this is going to be sad angst)

You were in Waterfall, it was night. It was very dark... After True pacifist... After barrier was broken... After Monster-kind was freed from Underground and after Monster-kind and Human-kind got along... You were still in Underground... Waterfall was quite dark... You were starving and dehydrated from not eating at all from begging of your adventure... as You see a blue light from far away, as you got to it and you see A Sans as he turned to you, his right eye was glowing, no... it was blazing with blue magic as his tears were rolling from his eye sockets, as he ran onto you to you in relief... As he hugged you very tightly... You hugged back as you were clearly struggling not to pass out...

Sans: There you are kid... I was scared... You know, You NEED to be with me or Paps or Toriel. The Underground isn't safe from Human thieves or Criminals since barrier broke... Also, your Soul... I can feel it's pulse... Damn, didn't know that you have THAT low HP...

He suddenly wraps his arms around you again as he picks you up and teleports you into Papyrus's/Sans's house.