Asgore's POV:

Alphys and Undyne had found a pair of skeleton children and wanted to adopt them, of course I allowed it! They were such sweet kids. Chara and Asriel were playing with Sans and Papyrus while Undyne, Alphys, and I did some paperwork. By "some" I mean a TON. Papyrus and Asriel were playing pretend and Chara read a book with Sans.

 "Well, it's been legalized. They're your sons now. May I ask their ages?" I said.

 "Of course, Sans is 7 and Papyrus is 4" Said Alphys.

Undyne's POV:

We arrived back home, "Maybe we should design some actual rooms for them" I said.

 "Y-yeah, that's a good idea" she replied.

After what seemed like forever, we finished the room. "It looks wonderful!" Said Alphys. "Sure does" I replied.

Sans' POV:

Mum and Mommy told me and Papy that they finished making our bedroom. We were very happy with it! Paps was making dinner with mommy, while I was reading in our room. I enjoyed engaging in activity for enjoyment and recreation rather than a serious or practical purpose with Princess Chara, Papyrus, and Prince Asriel.

 "Dinner!" Shouted Mommy. "Approaching!" I shouted back while advancing down the staircase. Dinner was Lactuca sativa mixed with Solanum lycopersicum and some other assorted nourishment. There was also some colorless, transparent, odorless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms in a strangely shaped beaker. After evening nourishment, we played "Proceed Pisces" or as mum and mommy call it, "Go Fish". Weird.

— A Few Years Later —

Alphys' POV:

I've noticed that Sans seems to get sick quite often and it's getting worse. He got sick a few days ago. Usually, Sans can just sleep it off, no problem. Now, he can barely walk. I'll go talk with Undyne about it. 

Undyne's POV:

I went to go drop Papyrus off at school. He's 9 years old and Sans is 12 years old. I hope Sans gets better.

"ᑗᘉᗫᖻᘉᙍ, ᗅᖇᙍ ᖻᓎᑗ ᗅᒪᖇᓿᘜᕼᖶ?"

"U҉m҉m҉... U҉n҉d҉y҉n҉e҉?"

"ꫝ​ꫀ​ꪶ​ꪶ​ꪮ​, ꪊ​ꪀ​ᦔ​ꪗ​ꪀ​ꫀ​?"

 "H-huh? Oh, sorry! I musta spaced out" I said.

 "ʜᴀʜᴀ yeah, I called you name ᴛʜʀᴇᴇ times..." Said Ms.Olive, "So... How's Sans?" .

Ms.Olive was a friend of Alphys and I, so she knew about Sans' illness.I

 I looked down, "I see, I hope he gets better" said Ms.Olive, better known as Lauren. "Thanks for understanding, see 'ya around Lauren" I said. She smiled, "See you soon!" .

- At the House -

 I arrived home, "Heya mom". "Hi Sans, how are you?" I asked. "Good, but my head hurts" he said. I sighed, "Rest well, punk", he smiled then coughed.

Get well soon, buddy.