Alphys only kept the camera's on in the Underground to make sure nobody was vandalizing the place, it was the birthplace of many of the monsters, after all. So imagine her surprise when she checked the footage to find a wolf and a skeleton animal down there. When she saw who they actually were, she had to show the others. "Wait a minute.. PAPYRUS IS A SHAPESHIFTER!!!" Undyne raged. Toriel and Asgore exchanged looks. "Well.. have you ever heard of werewolves?" Toriel asked.

♧♧♧

Meanwhile

We tracked Sans and Kyle back to Papyrus' house. "how was your guys night?"
"He showed me around Snowdin. Yours?" You asked. Kyle and Sans looked at each other and laughed. "Doofus over there got his head stuck in a hollow trying to get a squirrel!"
"OH MY STARS! AGAIN?!"
"I would pay money to see that!"
"Had to wait the rest of the night for him to get free." Kyle was still laughing. "was tempted to just blast the tree down.." Sans muttered. "Blast?"
"OH! SANS AND I CAN SHOOT MAGICAL LASERS OUT OF OUR MOUTHS IN OUR WOLF FORMS! WE DON'T DO IT UNLESS ABSOLUTELY NECESSARY THOUGH!" You glanced at your boyfriend. "You're loud this morning. Feeling better after the stress of the last few days?"
"MOST DEFINITELY! I'M STILL A BIT HYPER TOO!"
"Really? Didn't notice." Kyle mused. "I have a question."
"shoot."
"How do skeletons have babies?" You, Papyrus, and Sans froze and looked at Kyle in a WTF fashion. "I'm curious."
"uh.." Sans pulled up his hood. "uh..." The door slammed open. "I NEED ANSWERS SKELETONS!"

♧♧♧

You all looked at Undyne with the same WTF face as Kyle. "not the door.." Sans groaned, pulling down his hood. "what're ya going on about now?"
"YOU TWO ARE WEREWOLVES AND YOU DIDN'T SAY ANYTHING?!" You all stilled. "i don't get it. this a joke?" Sans kept oddly cool. He was good at hiding his emotions, you gave him that. "My friend, Papyrus and [Y/N] was caught in the Underground on the cameras. Tell me, was your mother Mweya Mwedziwesirivha?" Sans tensed. "who's that?"
"The last werewolf to fall into the Underground. She was a great friend, but left the Ruins in hopes of rebuilding her pack.. I did not think she'd.." Toriel trailed off. "FALL FOR A MONSTER?" Papyrus finished for her. "papyrus!" Sans looked alarmed. "WE WERE CAUGHT, MIGHT AS COME CLEAN. MWEYA WAS OUR MOTHER, THE PREVIOUS ROYAL SCIENTIST WAS OUR FATHER." Sans looked about ready to go off. Kyle put a hand on his shoulder. "I'd advise not, Alpha." Sans sighed in defeat. "come in. close and lock the door behind you."

♧♧♧

Asgore, Toriel, Undyne, Alphys, and Frisk gathered in the livingroom. "Your not going to bite them to, are you?"
"no. that'll kill them. they don't have determination for the wolf to bond to. it'd completely take over their magic and dust them." You flinched. Oof. "Ok. It was a valid question."
"So Sans and Papyrus are really half werewolf?" Kyle had been explaining what Sans told him, which was everything. "Mmhm. Sans is our Alpha and Papyrus is a pack tracker."
"S-sans.. an Alpha?" Alphys, all of them excluding Frisk, had trouble believing it. "IT'S TRUE. SANS WAS BORN THIS WAY." Papyrus inputted helpfully. You walked in and next to your mate.

♧♧♧

Sans paced by the window, not liking this. "You're not mad, are you Sans?" You asked. The Alpha werewolf paused. "i'm certainly not happy you were caught,  but no, i'm not mad either. we can't exactly control our actions on the full moon so.." He started pacing again. "So.. why can control the change any other time? Like when Papy showed me?" He nodded. "Papy? You act like you and Papyrus are together.. unless.. ARE YOU?!" Undyne demanded. "I-it was them I c-caught.." Alphys pointed out. Papyrus pulled you close and you leaned into him. "We are together. Is that a problem?" He asked. Undyne gawked, Alphys and Frisk squealed. "Heya Sansy, keep pacing like that and you'll fall through and into the basement." Kyle pestered, more in worry than anything. "nah, you wouldn't let me."
"So if you an Alpha and I'm a Beta and we Somehow had kids, would it be an Alpha or a Beta?" Sans stopped ubruptly, glowing neon blue. "Well that got him to stop."
"Kyle, oh my stars.." He grinned. "It worked though." Now everyone was staring at him. He waved. "Hey. I'm Kyle, that one's brother and that ones mate." Sans was getting bluer, if that was possible.

♧♧♧

Kyle carried Sans off to his room, you and Papyrus were left with the questions. "How strong are you?!" Undyne asked immediately. You and Papyrus shrugged. "Where more fast than strong." You answered. "Fine, how fast are you?" You looked at Papyrus. "I've crossed the entire Underground in a little under 15 minutes in my wolf form before."
"H-how long have you b-been together?"
"

Uh.. about two weeks.." You replied. "I.. can see why you told nobody." Asgore said suddenly. "With our history with werewolves, you probably felt threatened." Papyrus nodded. "And Sans wouldn't let me.. he's the Alpha, even if I'd tried to go against him, my instincts wouldn't allow me."
"You both make a wonderful couple. How do you.. change?"
"It's magic based!" You both said in unison, making you both blush. "SO CUTE!" Alphys fangirled. "Can I see it?" Frisk asked suddenly. "Not here." You said. "To tight. We'd go nuts." Papyrus concluded.

♧♧♧

Now everyone was following you both to the back and through the alleys. They all wanted to see. "How do I even?"
"It's instinctive. You'll get it." He replied. Finally you made it to the suburbs, near your house. "Huh. I do live closer to the mountain." Papyrus was headed to your back yard, you trailing behind. Once there, he immediately started changing. "P-papy! I don't know what I'm.." He shook off and looked at you expectantly, whining in encouragement. "Rude." What do you do? You'd felt.. a tug in your soul so then.. you called upon that? You immediately felt the magic and felt the change come down on you. "See? Told you it was instinctive." You huffed. "Shut your muzzle Papy!" You growled. He simply wagged his tail. "Don't forget our audience." You both looked to the awed monsters. "Right.."

1 chapter left. Sorry if this one was a bit.. all over. I'm distracted.