For what it's worth, if Stiles had known that Derek was gonna be sitting on his bed when he came home from bringing his dad dinner, he wouldn't have taken his shirt off, put it in the washer, and then gone upstairs to his room.
But Stiles was no werewolf. He had no super senses that could smell the grumpy Alpha, or hear his heartbeat.
So when Stiles walked into his room humming Twinkle twinkle little star, he had no idea the dude was there until Derek cleared his throat.
And Stiles, being the clumsy, hyperactive, awkward teenager that he is, screamed, threw his arms in the air, and ran out of his room, slamming the door behind him.
When he came back a few minutes later, breathing regularly, he glared at the man.
"What. The hell. Do you want?"
He would be proud to say he growled. But the growl Derek replied with was manlier.
"Well? Come on, Sourwolf, you can speak, can't you?"
"Stiles, shut up."
"At least you talked..."
Derek growled at him again. "I need you to research something for me."
"Oh. Great."
Stiles sat at his computer and looked grumpily up at Derek as the man stood up and walked over to him.
"What's being researched?" He asked.
"Mates," the Alpha replied.
"Wow. You didn't growl this time. That's impressive. You should do it more often," Stiles said as he typed the words in.
An article showed up, and Stiles read word for word out loud.
When he had finished, Stiles looked at Derek. "Got a girl in mind?"
"No," Derek said. "...I got a guy in mind."
"Oh. A guy? Wow. You're--? Ok! Not gonna go any farther...but I've got to ask." He leaned closer, a smirk on his lips. "Who's the lucky guy?"
Derek stared at him, as if he was finally realizing Stiles was useful to the Pack and couldn't believe it.
He opened his mouth, but then shut it again and kept staring at Stiles.
"Ok," Stiles said slowly, looking back at the screen. "So I'll print this, and then the lucky guy can read it with you, because judging by the look you're giving me, you were to busy being a creeper to listen to me."
He stood up, and Derek just kept staring at him as he collected the page.
"Ok, are you trying to creep me out?" Stiles finally demanded.
"No."
"No growl!" Stiles cried. "You didn't growl!"
Derek arched an eyebrow and finally looked away from Stiles, his eyes raking over Stiles' bed.
"You're sheets are dirty," he commented.
Stiles rolled his eyes and turned so his back was facing the man. "Ok, weirdo."
A hand suddenly grabbed his shoulder and spun him around.
Stiles gasped as Derek pushed him up against the door and kissed him.
When the man pulled away, he said, "You're the guy, idiot."
Stiles could only blink.
But then he grabbed Derek's shirt and pulled him forward, kissing him back.