It was Mettaton's glorious birthday gala. Every monster had been celebrating at the biggest party of the year, and some spectacles were seen that were never forgotten and some memories were made that must never be spoken of again, and he adored every minute. Undyne got to play with the pyrotechnics. Eventually tho, switching to his EX mode, Mettaton and his sweetest loves let the world party among themselves and retired to a secluded pavilion for a more private celebration -- and he adored every minute as well.
Before one of the warmest nights with his best friends, and before tasting the most... interesting cakes hed ever had, everyone gathered for his gifts: Papyrus ((wearing a special new collection of clothes -- featuring a particularly charming Lover Boy shirt -- you know, to show he cared)) gave him an admittedly amazing, autographed-in-rhinestones, mostly tasteful shirt printed with an image of The Great