Undertale Au's Age Regression One Shots! (Request open)

"skawy sto'ms!" Cg! Papyrus, little! Sans

Summary: Sans has a very bad fear of storms and one day they was a really bad storm which causes him to regress and for Papyrus to find him.

Ship: PLATONIC Fontcest.

Warnings: scared lil! Sans, and an accident, and pull-ups for Sans!

Sans whimpered as he heard thunder crackle from his window, it usually didn't affect him that much as he knows that as long as you stay inside you wouldn't get hurt, but that didn't stop him from pouting and curling in on himself and whimpering, he didn't mean to regress, so all his little gear was tucked away, and he was wearing his usual white shirt and black basketball shorts. It wasn't his usual little attire.

His back was against the headboard and was curled around himself, his arms wrapped around his knees and the light was on, not wanting the scary things to come and get him. He didn't like the sound and wanted nothing more than daddy to come and save him, he would always cuddle with him and tell him that it's alright or get behind the covers and read a book with him or tickle him until his giggles were louder than the thunder. He would like any of those options right now.

It was the middle of the day and he knew that if he just went to the living room then he'd be able to find his daddy. But would he be mad about the accident? Would he care enough to care for him? He whined, taking his pillow and hugging it close.

~In the living room, with the others~

"Sans has been in his room for a bit. Papyrus, do you mind checking on him?"

Papyrus looked up from the former queen when he heard what had been said "HE HAD BEEN BIG WHEN WE HAD LUNCH TOGETHER OVER AN HOUR AGO" Papyrus reasoned. Alphys's eyes widened when she realized something "Sans i-is scared of thunderstorms!" She said and Papyrus jumped up.

"I SHALL GO AND CHECK ON HIM! BUT PLEASE READY AN ON THE SPOT VERRY CUDDLY MOVIE NIGHT JUST IN CASE!"

Alphys and Undyne nodded and Toriel looked at Papyrus "if you do not come back in a few minutes I shall come and see what is happening" she said.

Papyrus nodded lightly and ventured to Sans's room. His SOUL practically melted when he saw the boy curled up on himself, whimpering.

"Honey, what's wrong?" He asked, taking a quieter voice and quickly taking a seat on Sans's bed. Sans made grabby hands and Papyrus took the boy, ignoring the wetness on the boy's pants.

"Skawy st'oms! Me nu like!" Sans next statements were just baby babbles but Papyrus nodded and pretended to understand.

"You do not need to be scared Sansy! For I, the great Papyrus, am here! Now how about we get you some better clothing and have a movie night?" Papyrus asked and Sans nodded, not to bothered by the fact that Papyrus pulled away to go to his closet, then there was thunder "Daddy!" Sans screamed, instinctively teleporting to Papyrus.

"Now how about we get you in a bath?" Papyrus asked, hugging his big brother close. He got out a light blue onesie and a white pull-up. Sans pouted.

"You know the rules little one, accidents mean pull-ups until you're big, it isn't a punishment, you're just in a deeper headspace" Papyrus said, bringing him to his bathroom. Toriel soon came after, looking at Sans.

"Papyrus, how about you come and make Sans a bottle and some snacks, then help Undyne and Alphys make a pillow fort? I shall handle this little cutie's bath" Toriel asked but Papyrus shook his head "I am sorry queen Toriel, but it seems that Sans is wanting to spend time with his daddy" Papyrus said, bowing his head to Toriel as a sorry "it is okay Papyrus, I understand. But if you ever need us, we shall be in the living room" Toriel said and Papyrus nodded again "thank you queen Toriel" Papyrus thanked and Toriel nodded, leaving the room.

Toriel gave one last smile as she left the room, leaving the two alone. Sans didn't even notice the thunder with Papyrus's phone playing soft music and his own giggles from splashing Papyrus.

"Okay, that's enough splashing Sansy, or timeout after bathtime" Papyrus said and Sans pouted but nodded "good, now tip your head back".

Papyrus helped Sans wash his hair and get cleaned up ("daddy! Skin feel sowft! ... "Nyeh! You would be even more soft and cuddly little star!". ) Papyrus was quick to pull up the pull-up up his legs.

"Say ah" Papyrus instructed, holding out his blue pacifier. Sans did so, taking it in his mouth. Papyrus then gave the child his stuffed bear "are you ready to go?" Papyrus asked and Sans nodded shyly, holding out his  hands which Papyrus took.

Sans made a squeal like noise when he saw the pillow fort and blankets in front of him that Undyne and Alphys had managed to make. Toriel swooped in and put the little boy down, making sure he was surrounded by the fluffiest blankets and the cuddliest stuffed animals they could find. A movie night perfectly set for the smartest of scientist.

Maybe Sans was slightly spoiled, but he deserved it.

Sans moved to seat on Toriel's lap, Papyrus and Alphys next to them with Undyne on the floor. Toriel fed Sans a bottle of warm milk while singing along with let it go from frozen.

After a while, the storm had been gone. Then it rang out again, and Sans whined, automatically reaching out for Papyrus who took him in his lap.

"Don't worry Sansy, we're here for you".