A.N. Hope you'd enjoy this story! I wanted to have something cute and adorable for a long time. The reason for me to have a cat in the story (well more like a half-feline and half cobra snake) is because I'm a cat person. Yep, so that's why I did as I did. Also when it comes to the part about Frisk. Frisk is a non-gender throughout the story. Just because the monsters don't know Frisk's gender. Hope you enjoy this story!

A short skeleton wearing a blue heavy coat with gray fur around the hoodie, black shorts with two white stripes at each end, and two pink fluffy slippers walk across the snow lazily. The skeleton yawn as he came up to a tree and sat in front of the tree. The skeleton began to close his eyes sockets and soon fell right to sleep.

After a couple of minutes, a black cat with blue shiny eyes with a long tail look up at this skeleton. The cat tilts its head as the cat study the small sleeping skeleton. Once the cat realized that this skeleton was no threat at all, it got on the skeleton legs and slept right with the skeleton.

Both the skeleton and the cat slept in the white fluffy snow for a long time. Soon it began to snow. The cat opens it's one eye to see that the snow began to get deeper. The cat didn't mind at all, likes the small skeleton warm heated bone body.

So the cat went back to sleep.

That was till a loud high pitch male's voice was heard calling someone's name.

"Sans, where are you?! This isn't funny!"

The cat woke up to listen to where this voice was coming from. The cat look up at the still sleeping skeleton to notice that the skeleton didn't hear that voice.

The voice that the cat heard began to get louder and closer to where they are. The cat stood up and was ready to attack if necessary. The cat's blue shiny eyes began to turn dark bloody red. As it began to hiss and growl in order to protect itself and the small skeleton.

Once the figure whom the cat heard stood about a distance away. The cat waited as it's black hair began to stick up on the back. The cat waited but soon saw the figure walk back to wherever they came from.

The cat began to calm down as its hair began to go down and it's red eyes began to turn back to shiny blue. The cat turns to look at the small skeleton. It seems the skeleton was still sleeping.

So the cat went up to the skeleton and lay right beside the skeleton. It kept its eyes open in case that figure returns and want to harm them both.

After few minutes the cat heard the small skeleton began to wake up. The cat shot its head up to see the skeleton eyes sockets slowly opening up to show his white eyes, pupil. The skeleton stretch and began to stand up.

The small skeleton turns to look right at the black cat looking up at him.

"Oh hey there, where did you purring from."

The cat seems to not mind the skeleton little pun. It looks at him with curiosity.

"Heh, I'm not sure where you are from. But uh… looks like you don't have a home."

The cat shook its head as if it understood what the skeleton was saying.

"Well" continue the skeleton, "looks like I gotta take you home myself."

The skeleton check to see what gender the cat is. As it turns out the cat is a male.

"Well then buddy. I guess I should introduce myself. The name is Sans, Sans the skeleton."

The cat gave a small smile.

"Do you have a name, cat?"

The cat shook his head.

"Well guess little old me should name ya. Since it seems you like me and all."

Sans began to think of some names to figure out for the cat. Just then a name pop up to his mind that he sure the cat and himself would like.

"How about Auttum? That's sure to bonafide name to remember of."

The cat began to wag his long black tail against the snow. Sans laughs knowing the cat had already like his new name.

"Ha, well Auttum looks like you got yourself a new family."

Sans began to pick Auttum up and carry Auttum in his arms. Sans look down as he began to walk back towards his home.

"You know I never remember seeing a cat like you down here before. I wonder where you come from?"

The cat didn't seem to hear what Sans had said. All the cat did was purr and enjoy the pets that Sans was giving him.

Sans enjoy having Auttum with him. Most times he would only just talk to animals and then be on his way. This one. Well, this one seems to want to stay with him. It was like the cat wants to be a part of his family or something.

Whatever the case, Sans is sure that his little brother is going to love Auttum as much as he already has. Sans use his shortcut magic to get back to the small town of Snowdin. It was really quiet and hardly anyone was out about this time of day.

Sans began to go up the stairs of his brown house when he heard the same high pitch voice calling his name.

The cat immediately began to turn his eyes red and began to growl. Sans turn to see a tall skeleton wearing a white body armor with blue shorts, has his big red boots on and his red scarf around his neck walking up to Sans.

"Hey Paps, what's up?"

Papyrus yells, "Sans, I look all over for you! Where in the world were you?!"

"Take it easy Paps, you know me. I was taking a cat nap."

"Nyeh! You lazybones! What if a hum…"

Papyrus stop when he saw the black cat in Sans arm looking at him a deadly glare. Papyrus look at Sans with a bit worry in his face expression.

"What is that?"

Sans said looking down, "oh this is our new pet. Found him when I woke up. He seems to like me. So I gave him a name."

Papyrus saw the cat wanted to pounce on him but Sans calm the cat down.

"Hey, it's okay boy. This is my bro Paps. He won't hurts ya."

The cat got down and began to look at Papyrus close. Papyrus began to shake but when the cat got a good long look at Papyrus. The cat nods and went back to sit next to Sans. Sans petted the cat on the head.

"Good boy, Auttum."

"Auttum?"

Sans look up at Papyrus, "that's what I decide to call him. I think he'll do us nicely."

Papyrus look down at Auttum then smiles.

"I think you're right brother. That name fits perfectly for this feline."

Sans nods, "yeah, just what I thought."

Sans pick Auttum up and the two brothers went inside the house with their new family member.

Two Months Later

The skeleton brothers enjoy having Auttum in their house. Auttum loves being with them. It took Auttum a little while to get used to Papyrus but after a few weeks, those two became good friends. As for Sans, Auttum stays real close to.

Sans enjoy having someone there to talk to and to have fun with. Though Auttum is very picky about being pick up and hold. Auttum won't let anyone but Sans holds him and pick up. Auttum would let anyone pet him but when it's comes being hold. Only Sans is allowed to do that.

Papyrus wish Auttum would let him hold but Auttum will fight if Papyrus began to lift him off the ground. So Papyrus only pets him and that's it.

One day, Sans and Papyrus were sitting on the couch with Auttum in between the two. Both skeleton brothers were watching TV while Auttum slept. Just then a loud knock was heard at the door. Papyrus stood up and went to answer it.

Soon a female sea creature with blue scaly skin has her red hair in a ponytail wearing a black body armor and a blue spear in her hand. She walks in and looks to see Sans walking up to her.

"Hey Undyne," said Sans.

"Hey Sans," said Undyne.

Papyrus began to talk to Undyne about his idea of joining the royal guard. Undyne was a bit shock to hear this news. She was about to say no but when she look at Sans seeing blue flames forming in his right eye socket. She nods and told Papyrus to meet her tomorrow at Waterfall.

Papyrus jumps up and down in joy. Sans laughs as his white eyes pupils appear back in his eyes sockets.

"You're the coolest bro."

Auttum woke up and look at Undyne. For some reason, Auttum did not like Undyne at all and didn't trust her. So with his blue eyes turn bloody red and soon a cobra snake fang began to form in his mouth. Real soon after that, a cobra hood began to form around his neck.

Auttum soon jumps down and ran full speed at Undyne. Undyne turns and scream as Auttum pounce on her and began to bite her hair.

"What the hell?! What kind of thing is this?!"

Papyrus stood shock as Sans grab hold of Auttum and pull him off of Undyne.

Sans look at Undyne anger and shock expression, "uh… sorry Unydne. Um… I'd never saw him like this before."

"What the hell is that thing?! It almost killed me!"

Sans too was shocked to see Auttum cobra snake look. He has seen cats anger before but this one was a whole lot different. Could Auttum be a half snake?

Undyne shook herself off as she stood back up. Papyrus apologize to Undyne for the whole misunderstanding. Undyne huff as she storms off of the house.

"I'm not coming back here again! Not with that thing here! Meet me at Waterfall, Paps."

Undyne slams the door shut as the skeleton brothers just look at Auttum in shock. Auttum calms down as his hood and his fangs magically form back to his normal self.

"How in the world?"

Sans didn't know what to say.

Papyrus too didn't know what he should say. He was too speechless.

Auttum yawn as he went back on the couch and lay down to sleep. Sans clear his throat when he finally spoke.

"How on earth that cat did that?"

Papyrus shook his head, "I guess he didn't like Undyne."

Sans nods, "that's for certain. I wonder what he got against her."

Papyrus shrugs.

Sans sat next to Auttum as Papyrus went into the kitchen to get dinner ready for the two of them and Auttum.

Sans look at Auttum and began to pet Auttum. Auttum began to purr and move his head to the side a little. Sans laughs.

"You are one crazy cat, Auttum."