Undertale-Portal of Memories

All of the different Sans and Papyrus copies from the AU are here and they are all living together under one roof! The original versions of themselves! What is the catch or the reason? That is rather simple, their own universes were all destroyed, the kicker is that it was not errors fault, they don't know what happened, but it cannot be fixed. Now, several years later, they are all coping with the losses of their other friends while making new ones.

There seems to be someone who wants things to fall out of place though, and he is targeting the original Sans to get it done. Now all of the AU have to band together closer to get him back after he is taken! How is this going to end? They will need to go back to their own universes to look back and see what they were taught that was important to them when they had gotten to their newest home. After all, lessons taught by friends are one of the most valuable things that you can gain, lets just hope it is enough to get them out of this.