Four years. That's how long it had been since Mettaton found out Alphys and Undyne were pregnant, both with twins. Now, four four year old tiny monsters (or demons in Mettaton's eyes) ran around his house with Papyrus chasing after them with a bone. Metta smiled serenely and patted his stomach, in which a tiny skelebot grew. 

"Sundyne! Dalphys! Rydye! Alpine! Come here this instant! Gah!" Papyrus tripped over his own bone and thunked his skull on the wooden floor.

"Aw, Papy, have a nice trip Darling?" Metta called to his husband, and the tall skeleton narrowed his eye sockets. 

"Very funny. Remind me, how long exactly was I away for?" Papyrus remarked, and Metta giggled.

"Only a minutes, but long enough for me to miss you terribly Dear." The bot gazed over to his husband and the two shared a moment of bliss.

"Oi, Papyrus!" Sundyne and Alpine yelled in unison, and Dalphys and Rydye tied the long legs of Papyrus' together.

"WAAAAAAAAARGH!" The skeleton fell over again, and this time a loud CRACK rang through the small home.

"Pa... Papyrus Dear? Papy?" Metta called out, and he saw Paps crawl slowly towards the sofa. A large hole in the centre of Papyrus' skull caught Metta's eye, and he saw the edges slowly turning to dust.

"PAPY! NO, DARLING!" Metta yelled, and he heaved his large frame off of the armchair he sat in and rushed to Papy's side.

"S... Sorry Metta. Low... HP... shouldn't of... been... playing with... demons..." Papy chuckled sadly, and the pink robot cried, gathering his husband in his arms.

"Uncle Metta? Uncle Papy?" The quadruplets were standing away, tears in their eyes, and Metta snarled at them unforgivably. The robot sat and wept as his husband slowly turned to dust in his arms, and kissed the ash pile when the process was finished.

"I'm calling your Mothers. Go sit on the couch. NOW!" Metta yelled, and he rung the two Demon breeders in a group call. 

"Your devil spawn just killed my husband. Get here quickly, before I murder them in cold blood." Metta hissed down the phone.

Mettaton awoke in his bed, considerably skinnier and holding his beloved skeleton in his arms. The bot wept with joy, and nuzzled his significant other whilst trailing butterfly kisses over the spot where dream-Papyrus had cracked his skull.

"I love you Darling. Don't ever leave me."