He'd been naked with other guys a hundred times in the locker rooms, but he'd never been "naked" with another guy.

Stiles had always thought Derek's bathroom was surprisingly nice for a barely habitable loft, but admiring the decor wasn't really part of the plan now. When Derek just began to strip as soon as they were inside, Stiles tried to do the same, only he found his attention being very much dragged from himself. Derek was still all lean muscle and smooth skin and Stiles couldn't help himself; he stared.

"Like what you see?" Derek asked in a casual tone as he stepped out of his sweatpants.

Derek wasn't wearing anything underneath.

"Oh god yes," Stiles replied, "and I'm allowed to look now, right?"

"You're allowed to look," Derek confirmed with a small smirk, "as long as I'm allowed to look as well."

Stiles glanced down at himself and all the nerves suddenly came back. He felt instantly inadequate. Derek was a Greek god, a very well endowed Greek god, and he was a skinny adolescent. When Derek stepped closer he looked up again, but he wasn't sure what to do.

"What's that look for?" Derek asked.

"Why would you want me?" he replied with his own question.

"You mean apart from the broad shoulders, legs that go on forever and moles that I want to trace with my tongue?" Derek replied and managed to stun him speechless. "You are the most intelligent person I have ever met and I don't just mean book smarts..."

"Um, Lydia," he felt he had to point out.

"Lydia doesn't count as a normal human being," Derek acquiesced, "she is in a class of her own. You have saved my life more times than I care to count. You can be the most annoying person on the face of the planet and yet, god help me, I like it. When everything is going to hell you just say something and it all seems manageable again."

"You like that I'm annoying?"

"I like that you should be annoying and aren't," Derek said. "I don't like that you're still wearing clothes."

"Oh," was the best he could do.

"Want some help?" Derek asked and just lightly touched the hem of his shirt.

He nodded and let Derek draw the material upwards. He still felt inadequate, especially when he glanced down and saw what Derek was packing again, but the way Derek looked at him made him think it might not matter.

"I'll start the water," Derek told him and left him standing there in his boxers.

It took a swift mental kick to get himself to move after that. He shucked out of his shorts quickly before he could change his mind and then when Derek stepped into the shower he followed. He barely noticed the temperature of the water because he was suddenly in Derek's personal space and his coordination wasn't good enough to prevent skin contact. The power under his skin flared at the touch.

"Do you mind if I wash your hair?" Derek asked as they stood under the spray. "It's kind of a wolf thing."

"Social grooming?" Stiles asked because by now he knew everything there was to know about real wolves.

"Something like that," Derek said.

"Sure," he replied; it wasn't what he had expected, but it made sense.

The moment Derek's fingers touched his head he was so glad he had said yes. No one had washed his hair since his mom when he was younger, but this was an entirely different experience. Derek's touch was firm, but caressing and Stiles couldn't help himself, as Derek lathered his hair with shampoo he moaned. He closed his eyes and decided that he was totally not going to be embarrassed by how much his body was reacting to the simple show of affection. It was so nice it even managed to shut him up, well mostly, he still made noise; it was in his nature.

He was kind of disappointed when Derek told him to rinse. That didn't last long, though, because then Derek had shower gel on his hands and those hands were on Stiles.

"Okay?" Derek asked quietly.

"Yeah," he replied, strangely breathless.

It was almost an out of body experience as Derek slowly washed him and gently nuzzled as his neck, just below his ear.

"If there's anything you don't like, just tell me," Derek said as his hands moved downwards.

Stiles bit his tongue, because he knew if he opened his mouth he was never going to stop talking, but he nodded. He was way out of his experience, but as Derek touched him, clearly exploring, he felt safe and looked after in the older man's care.

The fact he could feel the power inside him reacting to the contact really didn't help him do anything sensible.

"Let me take care of you, please," Derek whispered.

"What about you?" he managed to say.

"We have plenty of time," Derek told him and so he nodded again.

Under Derek's ministrations, Stiles felt his cock hardening from semi-erect to fully erect even though Derek hadn't dipped below his waist yet. The touches were soothing and erotic at the same time and he felt himself relaxing into them. When Derek's strong hands finally soaped over his buttocks he almost tensed again, but he pushed the instinct away. Derek wouldn't do anything he didn't want and if he didn't like it all he had to do was say.

As Derek kissed him he kissed back, letting Derek pull their bodies flush and he could feel Derek's naked erection against his hip. It was far more intimate than he had imagined and heat ran through his body. Soft lips covered his own and he let his tongue dart out, deepening the kiss and bringing one of his hands up to put against Derek's chest.

He was so involved in the touch of lips and tongues and the slight scratch of stubble that he only belatedly realised what else Derek was doing. Only as the pad of Derek's finger brushed across his hole did he notice where Derek's hand actually was. He started at the touch, moving forward against Derek and Derek stilled for a moment, clearly waiting to see what he would do and he took those seconds for what they were. It had felt strange, but he wanted this, wanted it far more than he could have realised, so he deepened the kiss again and moved slightly to give Derek better access.

Permission given, Derek started to tease him carefully as they continued to kiss. The shower gel was slick and they were only half under the spray now, so Derek's finger moved over his hole smoothly, pushing just a little harder every now and then. It was sensual and Stiles felt everything going straight to his dick. He kept losing the kiss, because the touches distracted him and eventually he put his face against Derek's shoulder and wound his arms around his lover. Derek started kissing his neck instead and he moaned quietly, nipping at the wet flesh under his lips.

For once he managed to draw a sound out of Derek, rather than the other way round. He wasn't quite sure what he had done, but clearly to Derek it was a signal to go up a gear, because Derek's slick finger finally breached him. He gasped and trembled, but realised quickly that he was pushing back into the sensation.

"Oh god," he said, the damn on his speech he had been so diligently trying to maintain blowing away, "that ... oh god."

His chaotic brain really had no way to deal with all the new input and all he could do was trust Derek. It was going to take him a while to adjust and his thoughts were scattering in so many directions. Holding on, he did his best to simply experience.

"Still okay?" Derek asked.

He nodded.

"More please," he said and pulled back a little, opening his eyes so he could look at Derek, "oh my god, more."

Derek obliged, smiling at him just a little, and slowly moving the intruding finger in and out of his hole.

"Never done this before," he said, unable to stop the words anymore; "should have tried it years ago."

"I know what will make it even better," Derek told him and his mouth might have fallen open as Derek slowly slid downwards. "You might want to hold on," Derek added.

"Oh my god," he said yet again, because it seemed to be only appropriate and grabbed for anything in reach that would support him.

Then he swore much more colourfully as Derek sucked his dick into what Stiles was learning was a very sinful mouth.

"Won't last," was as coherent as he managed, because he was only human and he was a teenager and he had something of a hair trigger.

"Don't need to," Derek said, pulling off for a moment and then Derek pushed one finger back inside him and began sucking him again.

He had no idea what he was saying, but he just couldn't shut up as the litany of words was the only thing between him and ending everything before it had barely begun. There was no chance of thinking unsexy thoughts to hold off, so he spouted nonsense as Derek tried to suck his brain out through his dick. He was proud that he managed to last a minute before he bucked into Derek's mouth and fell apart. That finally did make him nonverbal for a while.

Derek looked like the wolf who'd just caught the rabbit when he stood up again. Frankly, Stiles thought Derek deserved to.