The year is 2030. The monsters are now aboveground, freed by the then nine year old, now 11 year old Frisk. Papyrus is taking regular cooking lessons, Toriel's a teacher. And Sans? He's happy, finally. The nightmares have stopped, and he has an amazing wife and is an awesome dunkle to Frisk. But one day, he goes to tuck in said child, and finds a nasty surprise... SPOILER WARNING

Frisk is back in the ruins again and is confused. There they meet Papyrus, Alphys and...Chara? I don't know where I'm going with this...

Light returned to his black eye sockets and Sans stared at the ceiling of his old room. Blue tears were slowly forming in the corner of his eye-sockets. His memories were intact not a piece missing and he knew why. This would be true fully their very last run and he had to make it count. He would keep that damned Flower away from his Frisk even if it was Asriel to some point...