The dog is a girl.

Sans figured it out when he got her in a bath and began to try and scrub the layer of filth from her fur, it took a hell of a lot longer than he thought and he was exhausted afterwards, but he was over joyed none the less when he set her back onto the bathroom floor and quickly threw a towel over her.

He rubs the soft fabric over her fur and when he draws it back he chuckles at the ball of fluff that greets him, she sneezes and narrows her eyes, seeming displeased about the bath she turns and races out of the bathroom.

Shaking his head Sans goes about draining the tub and drying off whatever surface got wet during the ordeal, by the time he's finished he wants nothing more than to take a nice long nap on the couch.

Sighing heavily he drags himself out of the bathroom and makes a beeline for the couch, no dog in sight.

He knew cats were moody but he didn't know dogs could be too.

Shrugging he settles onto the cushions and lets sleep drag him under.

How humiliating!

She was thankful for the food but the bath was a bit much, sure he doesn't know but still! He touched her…everywhere.

Sure he stayed away from her more private regions but she can still feel where his boney fingers moved along her chest and stomach, making her fur stand on end.

It wasn't unpleasant…but she can feel the shame burning hot beneath her fur.

If he ever was to find out….oh lord help her, she'd never be able to face the skeleton again.

Speaking of the skeletal devil, she can hear him snoring from her hiding place in the kitchen, pealing herself off the cool tiles she pads into the living room to find him passed out on the couch.

He takes up nearly all of it…both of the skeleton monsters are tall, but this one is wider than his brother and slightly shorter, but he still dwarfs her and as she approaches the couch she can't help but stare at his smiling mouth full of sharp teeth.

When she first came across them she was insanely curious by their smell, they didn't smell overwhelming like humans, didn't stink as bad as humans, so she decided to see if she could find anything to eat from them.

Boy she hit the jackpot, they always filled their bins up to the top and she usually got a burger or two out of it, sure it wasn't enough to keep her satisfied but she was able to hunt sometimes….though it was harder without her pack and she'd only get a rabbit or two if she was lucky.

Shaking the thoughts of her family from her mind she carefully climbs onto the couch and curls up on the free cushion, maybe they'd let her stay? At least until she's stronger, then she can finally get unstuck and leave.

But until then she'll have to be content to stay in this form, if only for a little while longer, the burgers he fed her had some magical quality to them and with each one she ate she could feel her Soul growing stronger, patching itself up from the ordeal.

She still has a long way to go, Shifting takes a lot out of her and even if she's able to Shift back she'll be extremely weak afterwards, prone for attacks…a lone wolf has a slim chance, an exhausted, weak lone wolf is free meat.

She'll take her chances hanging around these brothers, so far Sans has been kinder than any human she's encountered so that's a start, the only one she's concerned about is Papyrus.

He's loud, she knows that from how many times he's woke her; she had made her temporary home under a neighbor's porch, and would wake to him yelling about how great he is and calling Sans 'lazy bones', though she admits the nickname always got a smile out of her.

Feeling the pull of sleep she slowly closes her eyes and allows herself to drift off.

-The sound of the front door banging open wakes her.

She estimates she might've gotten a few hours of sleep, of course she can always nap more later, for now she's too busy peering over Sans' sleeping form trying to find out who had invaded.

A fish lady…a very scary looking fish lady….and there's a kid…..and a dinosaur….a very small dinosaur.

"Yo punk!" The blue monster shouts, flashing a wide sharp toothed smile as she sets the kid aside before making a beeline for Sans.

Crap, crap….who is this woman? A friend? An enemy? She's loud and scary like an enemy and Sans is still sleeping….she lunges forth, lips pulled back and teeth showing as she shields the sleeping skeleton with her body, eyes locked on the now stunned woman.

"Whoa! Didn't know you guys got a mutt, does Papyrus know?" A familiar skeletal hand comes to rest atop her head, rubbing away the angry lines that had formed between her eyes, the snarl on her lips falls away and she turns to find that Sans is awake…..was he faking it?

"not yet, I just found her," Sans explains, "you guys are a bit early for the sleepover,"

The fish lady deadpans, "Sans it's nearly seven in the evening….."

"oops,"

"S-Strange she doesn't look like any dog breeds I've read up on…." The woman dinosaur shuffles closer, reeking of fear, but the scent fades fast as she approaches and offers her small clawed hand for her to sniff.

She smells like chemicals, books…and ramen? It's a weird combination….but it's a lot better than the scent of fear and she nudges her hand in greeting.

"I wasn't sure what is she, but you're welcome to try and figure it out Alphys…did you bring movies Undyne?"

"Of course I brought them! I love Paps but I think we've all watched enough Mettaton movies to last us a lifetime,"

The kid who had been silent up until this point moves forward to lightly pet her head, "What's her name?"

"huh?"

"Your dog," The child smiles and lightly cups her face in her hands, squeezing gently as they giggle, their brown almond shaped eyes are bright and they reach up to brush some of their dark hair from their eyes.

"oh didn't think of that," Sans admits, sitting up to adjust himself on the couch, making room for the child to climb up between him and herself, their small hands move along her neck and over her shoulders, smoothing down her fur.

"I can help," they offer, giggling again when Sans reaches over to ruffle their hair.

"sure kiddo go ahead,"

Oh gosh please don't be a stupid name….

The child narrows their eyes in thought, keeping a hand on her back she feels a warmth seeping into her….going just beneath her skin and fur, reaching out towards her Soul…..

"Storm,"

"Storm? Aw why not a cool name like Killer? I mean did you see her teeth?! She needs a badass name,"

"O-Or a smart name…maybe something from an anime even….?"

"why Storm kiddo?"

"Her fur looks like storm clouds," Frisk answers, suddenly wrapping her arms around her, the child tucks their face in close beside hers as they suddenly whisper, "I'll keep your secret Ana….I promise,"

Her hackles raise in alarm as the child pulls away and smiles brightly, "Her name should be Storm,"

"Storm it is," Sans chuckles, scratching at his stomach lazily.

Frisk smiles and climbs off the couch, hurrying off to the kitchen, frowning she gets up and follows swiftly, finding the child climbing onto the countertop opening a cabinet filled with snacks.

"You know my name,"

The child jumps and turns slightly, a pack of pop tarts in hand they blink and glance back towards the living room before looking back to her, "You talk…" They whisper in awe.

"Barely…hard to focus…..on voice. Soul weak," Her voice is rough, primal sounding, the beginning of her words start off as growls.

"Are you a monster like them? Were you hidden somewhere in the Underground?" Frisk climbs down, but not after grabbing another silver package of pop tarts.

"No…..werewolf…different monster….."

"A Surface monster…like all those urban stories…you can transform?!"

"Shhhh…..too weak…Soul damaged…."

"How?"

She falls silent, growling gently in her throat as she shakes her head no, frowning Frisk opens one of the packages and passes her the pop tarts that were inside.

"I promised I'll keep your secret….but I want to help…" Frisk scratches gently at her head, fingers working around her ears.

"More magic food," She answers, licking crumbs from her muzzle she follows Frisk back to the living room, where she joins the child on the floor by a Monopoly board Undyne and Alphys had set up, the two of them already picked their pieces.

Sans was a sleep again.

"Alright let's get this sleepover started!" Undyne cheers.

Laying her head on her paws she settles in to watch the game unfold, hoping Frisk would keep to their word…she just met the child, but she can tell they take promises very seriously.