Disclaimer: I do not own Teen Wolf.

Warnings: Slash Fic! Rated M for a reason! Some Season 4 Spoilers

Idea sparked by the song Flesh by Simon Curtis. First time trying to write something any heavier than kissing, so I hope it's not too bad. Set after season 4.

xxxxx

Derek shoved Stiles up against the door to his loft, pressing his mouth against the younger male's hungrily. They had just finished fighting off the most recent baddie to invade beacon Hills, convinced that was going to take over. A witch this time. Scott and his pack had quickly shown her how wrong that decision had been.

Naturally, Stiles had put himself stupidly in harm's way, nearly getting himself killed for another one of the countless times since Scott had been bitten. This resulted in, once again, Derek needing to come to his aid, saving his ass.

The teen shifted slightly, trying to get more leverage in the kiss, pinned between the door and the two hundred pounds of werewolf pressed up flush against him, causing said wolf to groan. Stiles smirked into the kiss, rolling his hips up to meet Derek's, both of them gasping at the friction of their already apparent erections.

Stiles and Derek had been together for just over a year now, Derek having finally realized his feelings after having nearly dying himself. Turns out he was evolving. He had inherited the power that his mother had when she was alive, the ability to shift into a full wolf. He was stronger than ever, but there had been some other, unexpected side effects. The most prominent being the controllable attraction he felt for the thankfully now legal teen had developed into full blown lust. Just the scent of the boy was enough to drive him wild, as it was now.

The pair broke panting with the need for air, Stiles with a grin on his face and Derek with a small loving smile. "I love you." whispered Stiles. Derek's smile grew. He would never admit it in front of the rest of the pack, but he loved when his boyfriend would get sappy. He loved the sweet words Stiles would whisper, when only Derek could hear. The way he liked to cuddle up in bed or on the couch pretending that the rest of the world didn't exist. The way Stiles would still get so nervous when he did something sweet or loving, which was often because that was just Stiles, even though they had been together for so long. No, he would never admit it. Those moments were only for Stiles.

Instead of a response, Derek hoists Stiles up, forcing the teen to wrap his legs around his boyfriend's waist causing even more friction between them. He keeps Stiles pinned to the door, hands under his ass, his werewolf strength more than enough to keep the boy up easily. Stiles wrapped his arms around Derek's neck, pulling him in for another bruising kiss. The thrill of having nearly died still courses through his veins.

Stiles wines in complaint when Derek pulls away shortly, but the sound morphs into a moan when he attaches his lips to his neck, sucking lightly. Derek works his way down from Stiles' jaw to the junction between his neck and shoulder, only moving from one spot to the next when he is satisfied that there will be a mark there for days to come, marking the boy as his.

Derek's mate. Stiles knew he had been claimed by the former alpha the moment Derek had slipped through his window only a few nights after the incident in Mexico and confessed his feelings. The night had ended with some heated kissing, nothing further, though Derek had spent the night with him in his bed. Not that Stiles was complaining though. He had acknowledged his feelings for the older man far earlier than Derek had, finding that he saw him in a new light after the kanima issue. Holding someone up in a pool for two hours can really change how you feel about a guy. It was a miracle that none of the werewolves he surrounded himself with, let alone Derek himself, noticed the scent of arousal that he was sure poured off him whenever in the other man's presence.

Derek's grip on Stiles tightened, his lips finding Stiles' once again as Derek pushed away from the wall and made his way to the bedroom, trusting his wolf to lead him there, being a bit too preoccupied with shoving his tongue down Stile's throat to pay much attention to the task himself. When he felt his shins hit the edge of the bed, he promptly dropped Stiles onto the soft mattress, earning a loud squawk from him for both the unexpectedness of it and the sudden loss of contact. Stiles glared playfully up at his boyfriend who stared down at him with desire laden eyes.

Gently, Derek bent down and began to pull of Stiles' shoes. The younger male, propped up on his elbows on the bed, watched as his mate tugged off each show, followed by his socks, with a soft smile on his face. When Derek had finished with that job he proceeded to discard his own before crawling on top of the boy watching him so fondly and kissing him softly. It didn't say that way for long, however. Stiles soon detached from Derek's lips and moved to his neck with the intent of returning the favor of all the marks now littering his own.

Stiles kissed his way down Derek's throat, one hand coming to rest on the waistband of his jeans, the other tugging on his shirt. Derek made quick work of the offending piece of clothing so that Stiles could resume his ministrations. The boy reattached his lips to Derek's neck, and placing his hands on the older man's shoulders, promptly flipped them so that he was on top, straddling Derek. He then continued nipping, licking and sucking at Derek's jugular until there was a notable mark. The two men were both perfectly aware that the mark would not remain for more than a few hours, but it still pleased Stiles to see his mark on his mate, even if it was only for a little while. Besides, he could always make new ones.

Stiles continued down his boyfriend's chest, trailing patterns of soft kisses, with the occasional harsh nip at Derek's stomach, causing him to groan. When he finally made it to the next barrier, otherwise known as Derek's jeans, Stiles paused to look up at Derek who glared down at him in irritation for stopping. The glare didn't stay for long though when Stiles started making a show of undoing the button and zipper with his teeth, long fingers tracing lazy patterns on Derek's hips.

Derek's eyes widened a bit, mouth dropping open slightly at the sight. He had no idea where Stiles had learned that particular trick, but damn was it sexy as hell to watch.

Stiles tugged off Derek's jeans and climbed back up to hover over the man and kiss him deeply. Now as much as Stiles loved to be in this position with his boyfriend, Derek was never one to be dominated for long. Grabbing the back of one of Stiles' legs, the other hand on his shoulder, Derek flipped them quickly. Stiles smiled into Derek's mouth. He had always preferred this position anyway.

Derek pulled away, both men breathing heavily. "You have too many clothes." Derek grunted. Stiles laughed and put his arms above his head, allowing Derek to remove his shirt. His pants quickly followed, which Derek pulled off swiftly, boxers included.

Now completely bare in front of the man he loves, Stiles giggles. "Now who has too many clothes?"

Derek grins wolfishly and stands, slipping out of his boxers. Stiles takes a moment to appreciate the sight before him before holding his arms out to Derek, spreading his legs slightly in invitation. Derek accepts instantly, sliding back to his position between Stiles' legs, running a hand up one thigh to his knee, pulling the appendage around his back. Stiles complies, reaches up and weaves his long fingers through the short hair at the nape of Derek's neck, pulling him down until their lips are nearly, but not quite touching. "Fuck me." He breaths.

Derek closes the distance between their lips while simultaneously pushing inside Stiles. The sharp gasp Stiles gives at the initial twinge of pain is swallowed by the kiss. Once Stiles manages to relax, Derek begins a slow steady rhythm. Another thing that Derek loved about Stiles, something that no one else knew, though probably wouldn't be surprised to find out, is that he was just as loud during sex as he was when he spoke.

But what Derek loved most, is that it wasn't the incessant babble that came out of the boy's mouth, that he had slowly grown to find endearing. Everyone heard that on a daily basis, some tolerating it better than others. This was a completely different sound. One that only he got to hear. One that only he was capable of eliciting from his mate's lips.

The moans Stiles let out as Derek thrust into him were filthy, lewd noises. Combined with the feeling of Stiles' dull fingernails scraping down his back and the look of utter bliss on the boy's face, well, Derek didn't think he had ever been or would ever be this turned on by another person. Nor did he want to. Stiles was his mate, and as far as he was concerned, that meant forever. Derek wasn't going to let this get away from him.

The moans that continued to slip from Stiles' mouth were quickly turning into desperate whines and pants signaling that he was close to release. Derek took this as the hint to slide his hand from where it rested on his waist down to wrap around his mate's erection and pump. Stiles' whole body arched at the feeling and came, Derek following quickly at the sensation of the boy clenching around him.

Stiles gave Derek a lazy kiss as he pulled out. "I love you." he whispered again as Derek moved to lie on his back, pulling Stiles with him so that his head was resting comfortably on his chest, and pulled the covers over them both. Stiles wrapped an arm around Derek and snuggled deeper into the man's side. Derek sighed contentedly.

But it wasn't until he heard Stiles' breathing even out and he believed that the boy was asleep that he responded.

"I love you too." He whispered, almost inaudibly. "Forever." And Derek could have sworn Stiles smiled into his shoulder as he drifted off.

xxxxx

I'm considering a second chapter of pure fluff that will take place the morning after. Let me know what you think!