Derek was regretting his choice. He thought putting up with an adult Stiles was hard work, he never thought what a baby Stiles would be like.
The boy pup had quickly attached himself to Derek when he walked into Scott's house. The alpha asking him for help when his mom left him to handle the pup. He had no clue what he was doing or how to care for a werepup. Derek, being the only born were creature with experience, was his second choice for help. Derek of course agreed and drove over to Scott's house.
The second he entered the McCall home, the pup ran to him and continued his earlier attack on his boots. "Alright little one." Derek picked him and flashed his eyes, the pup doing the same in response. "Have you fed him?" Derek held the pup with one hand has he walked over to the exhausted wolf. "I haven't had the chance to pick up the stuff for the formula. I was hoping you could watch him and I'll go get it. Stiles is on his way to help as well." Derek once again agreed and sat down on a couch to "distract" the pup.
Scott thanked him and ran out the door. Something told Derek he wasn't coming back for a bit. His suspicions were confirmed when Stiles walked in with the ingredients to the wolf pup formula. "Let me guess? Scott left you saying he was going out to get the ingredients?" Derek nodded and continued to wave his hand in a circle for the pup to chase.
"I'll make the formula. You keep him entertained." Derek handed the pup to Stiles and took the bag from his hand. "What am I supposed to do? Play fetch?" Stiles held the pup at arm's length watching as he wiggled around. "What's his name?" Stiles placed the pup on the couch and sat down next to him. The pup started to try and bite Stiles's hand, without teeth the most he could do is slobber on him.
"Lydia is with the Sheriff trying to figure out the names." Derek worked carefully to mix the formula and heat it up. "So let's just call them baby B and baby G." Stiles looked up when Derek entered the room. "We can't call them that." The werewolf took the pup from Stiles and sat down on the other end of the couch. He checked the bottle's temperature before he started to feed the pup.
"Then what do you suggest we call them?" Stiles huffed, he wasn't fond of his idea being rejected. "Let's wait and see what their name is before we go naming them." Derek pulled the bottle away from the pup when he started to drink too fast. "Well what do we do with wolf puppies? Teach them to rip peoples' throats out... With their teeth." Stiles teased remembering all the times Derek threatened him with that line.
"No Stiles, we feed him, wait a bit then take him for a walk. Just like a regular dog. If he shifts back then we treat him like a normal baby." Stiles rolled his eyes and grabbed the remote. "Sounds boring. I'm sure an experienced wolf like you're self can handle it." Derek gave him an unimpressed look before putting the pup down. He had drank most of his formula and Derek didn't want him to get sick.
It didn't take the pup long to need to go to the bathroom. Derek had followed the small canine to the backyard where he ran around for a bit till finally using the bathroom. Stiles was forced to pick up when Derek's phone rang.
"Lydia said they were unnamed. The records show their date of birth and who their parents were but no names." Stiles was sitting on the ground with the pup running around him, chasing a makeshift chew toy. "So what do we call them?" Stiles tossed the toy at Derek's feet and watched as the pup attacked it before getting distracted by Derek's boots.
Derek watched the pup play before getting an idea. A smirk forming on his face as he looked at Stiles. "Mischief. We'll call him Mischief, since he's so hyperactive like you." Stiles tried to hide his shock. "Why would you call him that?" Derek's smirk grew. "Well isn't that how you used to pronounce your given name?" Stiles glared at the older man. "Who told you that? Was it Scott? I'm gonna kill him and wear his fur as a hat!" Stiles stood up and pulled his phone out.
"Calm down Stiles. I've known your name for a while, ever since Peter bit Scott. The mischief thing you told everyone when you were drunk at the pack summit." The McCall pack met with a pack from Washington and they had a bit of a after party where the younger wolves learned about wolf whiskey. Stiles had drank his fair share and got more than drunk. When a girl asked why his parents named him Stiles he told them all the story of his real name.
"I hate you all. You're all horrible pack mates." Stiles walked over to Derek and picked up the pup from his feet. "C'mon Mischief, mama Derek is being mean." Stiles turned on his heel and walked away with the pup. "Stiles!" Derek chased after the human, grabbing the extra formula and locking Scott's front door.
Stiles drove to his house and let the pup run around as he grabbed a snack. He had just sat down when Derek walked into his house without invitation. "Normally when people storm off, the other person doesn't follow." Stiles quipped. "I wouldn't have followed if you didn't take Mischief and left his formula." Derek held up the bag with the ingredients and the bottle.
Stiles had ignored Derek and vice versa, each of their attention was on the pup. Mischief just couldn't seem to stay in one place, he was so curious. He got into everything and anything. Derek was constantly lifting different pieces of furniture just so Stiles could grab the pup and scold him from getting stuck again.
"Can't we put him on a leash?" Stiles complained when Mischief bolted out the front door the second Derek walked in. The older man had left to get some toys at the pet store in hopes that he could get the pup to stay in one spot. "No Stiles we can't. He's a human baby." Derek grabbed the pup before he could make it off the porch.
Derek dropped the bag of toys on the couch and held up the pup. He flashed his eyes hoping the pup will calm down, he got the opposite. The pup started to squirm more and began to whimper as if in pain. "What did you do to him?" Stiles got closer, both men watched as the pup shifted back to human.
"Um?" Derek held the baby at arm's length, looking him over for any sign on injury. Mischief seemed to be unharmed. "What do we do now?" Derek looked to Stiles, who was holding in laughter. "What are you-" Derek felt something warm seep into his shirt. The werewolf looked down to see his white t shirt wet and slightly yellow. The baby boy had peed on him. "Are you kidding me!"

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A Pup Of Our Own
FanfictionThe pack rescue two, recently orphaned, babies. One becomes very attached to Liam and Theo. Theo can't seem to give up the little ball of fluff and rage.