A/N: Finally! Sorry this took longer than usual, but hey, it's here! Enjoy, and don't forget, I'm taking Sterek one shot requests!
DEREK
The second Derek stepped through the front door Scott pounced on him. Metaphorically of course, Derek would slaughter him if he physically jumped him.
"You smell like him again." Derek rolled his eyes at his brother's statement, he wasn't in the mood.
"And you smell like pizza. Are we done playing I smell with my little nose?" He snapped. Scott sighed dramatically.
"You're hogging Stiles."
"He's not a toy." The pair glared at each other stand offishly, Derek's eyes flashed red unintentionally and Scott whimpered in submission. "If you wanna hang out with him so bad why not text him instead of moping like a kicked puppy." He advised, Scott's brow furrowed.
"Maybe I would text him if I didn't feel like he doesn't wanna hang out with me now he has you." Scott said in a small voice. Derek felt a pang of guilt, normally he didn't care that much about Scott's childish tantrums but this was his fault. He punched his brother lightly in the shoulder, a hint of awkwardness present.
"He talks about you a lot, you know." Scott's expression brightened a little.
"He does?" Derek nodded reassuringly.
"Text him, Scott. You're his best friend too." He said firmly. Scott exhaled, rolling his shoulders as if he was tense.
"Maybe we could all hang out together? It's his birthday soon." He suggested enthusiastically. Derek scrunched his nose up.
"And do what?" He asked, hesitance evident in his tone. Scott elbowed him jokingly.
"Treat him to ten buckets of curly fries or something. Come on, I'm not that annoying, am I?"
"You really are."
Scott moved to punch Derek in the arm but he caught his fist and twisted it behind his back.
"We'll go on his birthday, that's Friday if you didn't know. If you get too irritating or tell him any embarrassing stories I'm taking him away."
"He's not a toy." Scott mocked, then whined in pain as Derek tightened his grip on his brother's arm.
"Go to bed Scott." Derek sighed, releasing him after putting Scott through sufficient discomfort.
"Whatever, Derbear." He stuck his tongue out then ran up the stairs like lightening when Derek whipped round to growl at him.
Melissa wandered out of the living room, a book in hand. She cocked an eyebrow at Derek, silently requesting details.
"Stiles, plus you, plus Scott... That sounds like a recipe for disaster to me." She remarked, leaning on the doorway of the living room, one hand on her hip.
"It'll be fine." Derek snapped defensively, Melissa snickered.
"Whatever you say Derbear."
"I swear the next person to call me that is going six feet under."
"No death threats in the house Derek." Melissa scolded comically.
STILES
Friday the 8th of April came around surprisingly quick, much to Stiles' delight. He was woken up by his parents singing (yelling) happy birthday. Dean was brandishing a crown that read "18" and Castiel was holding a cupcake with a candle in it.
"Happy birthday kiddo." Dean grinned at the end of his duet with Cas, kissing Stiles on top of his head. Stiles blew out the candle and set the cupcake on his bedside table, pulling both his fathers in for a hug. Dean set the crown atop Stiles' head and bowed mockingly.
"Thanks dads." He joked, digging into his cupcake.
"There's second breakfast downstairs if you want it. We'll wait for you to open your presents." Castiel informed him, then left the room, Dean in tow.
Stiles grabbed his phone and checked his messages, there were a few informal happy birthdays from school friends, but he saved the two best messages until last. Scott's read;
'Happy b'day buddy, me+D have a surprise 4 u l8r!'
He smiled at the text then opened Derek's;
'Happy birthday Stiles. I'm looking forward to seeing you later, especially now that you're 18. X Derek.'
Stiles turned bright red. Had Derek meant what he said in the way Stiles had perceived it? And was that a kiss at the end or a typo?
He replied quickly to both messages then bounded downstairs for second breakfast and his presents.
When he arrived in the kitchen, there was an obscenely tall tower of pancakes drenched in syrup on the table and his mouth watered. At the other end of the table was a pile of rather hilariously wrapped presents, some covered in 'Merry Christmas' paper and others in pink paper from Sam's daughters birthday last month. He grinned from ear to ear and tore into the pancakes, then the gifts.
The first was a t-shirt from Castiel that was exactly Stiles' taste, it read 'If you can't handle my sarcasm I'll tone it down just for you' with a rather condescending smiley face beneath it.
"Thanks pa, this is great." He chuckled.
"Dean had to explain it to me but it suits you very much." He said excitedly.
He then picked up a small box and prepared to tear it open bit Dean stopped him.
"Save that till last." He smiled mischievously. As much as the curiosity over what was in it was killing Stiles, he did as his dad said and opened the rest of his presents which were equally fantastic. Dean had gotten him some headphones that had 'If I have these on don't talk to me' written on either side and the new Sims game which Stiles was ecstatic about.
Castiel's other gifts consisted of a waffle maker, and for some strange reason, a key ring with a metal slice of pizza hanging from it. He looked up at him in confusion, then Dean nudged the small box towards him, a maniacal look on his face.
"You didn't." He deadpanned. "Dad please don't let this be a prank." He exhaled, ripping into the paper.
The little black box had the word 'Jeep' embossed on it and Stiles' heart skipped a beat.
"No freaking way." Lifting the lid off the box, he revealed a key that was unmistakably for a car. "DAD IF YOU'RE JOKING TELL ME NOW BECAUSE THIS ISN'T FUNNY." Stiles yelled, running to the front door, Dean and Castiel followed cackling like a pair of badly behaved children. When Stiles opened the front door, he nearly fainted.
Sitting on the front porch was a blue 1976 Jeep CJ5. He nearly tripped over in his hurry to get to it.
"Thankyouthankyouthankyou." He cried jumping up and down while clinging onto the bonnet of the car. His parents simply smiled, Dean slipped an arm around Cas as they bathed in their son's happiness.
And just as Stiles thought things couldn't get any better, he heard the sweet rumble of the Camaro as it pulled up to the kerb.
"Happy birthday!" Screeched Scott as he leapt out of the car and squeezed Stiles. He handed him a hard, rectangular package then chanted 'open it!' until Stiles did so. It was Call of Duty: Black Ops 3 and a gift card that read 'Free curly fries for a year at Mary's'
"God dammit Scott I think I love you." He sighed and hugged him.
"I would hope not." Came the voice Stiles' had been waiting to hear all day. He whipped round to see Derek standing a few meters away with a matte black gift bag in his hand and a small smile on his face. "Happy birthday." He said, flashing him one of those rare, illuminating grins. Stiles hadn't realised he'd been standing with his mouth hanging open until Derek began to walk over and he quickly shut it.
"Thanks Derek." He grinned, hugging him too, breathing in his unique scent.
When they broke apart Derek handed him the gift bag and Stiles looked inside, three packages wrapped neatly in silver paper sat inside.
"Let's go inside so I can open these." He said and the three trooped into the house.
Derek had bought him a black limited edition Batman t-shirt and an expensive looking leather jacket, much like his own. Stiles went to open the last present when Derek stopped him by placing a strong hand on his wrist, he glanced up to see if Dean, Cas and Scott were still distracted by each other, then whispered in Stiles ear.
"Open that later. When you're alone." Stiles felt his face heat up like a radiator and nodded dumbly. "Mary's?" Derek suggested and the three bid goodbye to Stiles' parents and went to stuff themselves silly with curly fries.
DEREK
He had to hand it to Scott, the day hadn't actually been unbearable, in fact, he'd had fun. Stiles sat in the passenger seat groaning about how he felt as if he was going to explode and Scott teased him further with a series of candid photos of him eating curly fries in an animalistic manner.
"Scott which way is it from here?" He asked his brother.
"Turn left at the end of this street." He instructed. Stiles suddenly sat up.
"What? Where are we going?" He asked inquisitively.
"We are going home. Scott is going to Allison's." Derek explained, trying to keep his expression serious despite the hilariously shocked look on Stiles' face.
"Oh." He said quietly, slumping lower into his seat. Derek noticed a change in his scent, nerves were practically radiating off him and apparently Scott smelt it too.
"My mom left a huge lasagne in the fridge for you as a present." Scott nudged him from the back, Stiles immediately perked up.
"Oh man I can't freaking wait to eat it."
Derek and Scott snorted in an almost frighteningly similar manner.
"Weren't you just whining about how you ate too much?" Derek remarked, Stiles folded his arms defensively, a determined scowl in place.
"I always have room for lasagne."
STILES
Five minutes later Scott was fist bumping Stiles and giving Derek a warning glare before bounding up to Allison's front door. Derek drove off and they continued their journey back to the Hale house. Stiles parents knew he was staying there but were okay with it because they thought Scott and Melissa were going to be there, and by the sounds of it, only Melissa was.
It was quiet until they finally reached the large house in the familiar forest clearing, and Stiles strolled through the front door expecting to see Melissa in her usual armchair reading her book.
Except she wasn't.
"Where's your mom?" Stiles asked, trying to sound as casual as possible.
"Night shift." Derek answered, leading him into the kitchen. The nerves kicked in full throttle again and Derek pulled him into his arms, kissing his temple. "Happy birthday Stiles." He whispered, making him shiver. He took the black gift bag from Stiles' hands and set it on the kitchen island and retrieved the final mystery present.
"Open it." Derek smirked. Stiles grabbed it and slowly pulled off the pretty silver paper to reveal a piece of black cloth with the Batman logo on it. He picked it up, unfolded it and realised they were a pair of briefs. Derek had bought him underwear. Batman underwear.
"I'm speechless." Stiles stuttered out.
"Do I get a fashion show?" Derek requested innocently, green eyes wide. Stiles spluttered and scoffed.
"You sure are flirty today." He commented and Derek simply smirked devilishly.
He turned away from Stiles to the fridge and pulled out a bottle.
"You know, in the UK you'd be allowed to drink now... Wanna pretend we're in the UK?" Stiles jaw dropped, then he mirrored Derek's expression.
"Sounds smashing mate."
"Never say that again Stiles."
FORTY MINUTES LATER
DEREK
"That was some smashing alcohol mate." Stiles slurred, throwing a thumb up rather violently.
"Yeah I see that." He chuckled as Stiles did a wobbly twirl in the middle of Derek's bedroom to the sound of Winger's Seventeen. Derek couldn't get drunk of course, but simply watching Stiles in his intoxicated stupor made him feel dizzy with happiness.
He suddenly plopped down on Derek's bed next to him.
"Oh no." He breathed, his face solemn.
"What's up?" Derek asked, concerned. He edged closer to Stiles, eyeing him closely. Stiles pulled out his phone.
"We don't have any pictures together!" He announced, opening the camera app.
Derek rolled his eyes but kept a straight face as Stiles tried to fit them both in the frame with uncoordinated hands. He took a picture then frowned.
"Derek you have to pull a silly face or I'll look stupid." He whined.
"Fine." Derek sighed, morphing his mouth into a ridiculous 'O' shape and feeling like an absolute idiot as he did it, but Stiles' delighted reaction was worth it.
Stiles flopped down on his side and wriggled his way up to the head of bed.
"I'm tired Derek." He moaned, struggling to pull the Batman shirt off his body. Derek laughed and gently helped him out of his outer clothes. He drew the blankets up around Stiles and tucked him in so he'd be warm until Derek was undressed.
Just as he was about to get into the bed, Stiles rolled over to face him, but his eyes were closed.
"You're so nice to me Derek... I love you..."
His breath caught in his throat. Had he heard that right? He watched his mate hum sleepily as he got his heart rate back under control. Stiles loved him.
And with that thought lingering on his mind, Derek slid into bed next to Stiles and hugged him close to his body, listening to the way he breathed and how his warm skin felt against his.
"I love you too Stiles."