A/N: So this is my first porn. Be nice plz? Thanks to NnoitraSzayel for betaing :)

Xenon
"John, just listen to me for a second!" Sherlock cried in frustration, following John from the kitchen to the bedroom.

"No!" John shouted back. He was rummaging in the back of the closet for his suitcase. "I am not going to sit here and watch you destroy yourself, Sherlock."

"You aren't listening! That stash was from months ago. I've been clean since December."

"Right. You expect me to believe that."

"It's the truth."

"Yeah, because you've never lied to me before. Never put your next high before my well being, my sanity!"

"John, for God's sake! We should not even be having this argument!"

"I think we should! Because I'm not sure which you love more, me or the cocaine!"

A look of surprised hurt passed over Sherlock's face like a wind-blown cloud across the sun, before he replied in a more subdued tone.

"Xenon."

"What?"

"Cocaine is my xenon."

"You're going to have to elaborate a bit more if you want me to know what the hell you're on about."

Sherlock took a step toward John and spoke in the same fast, low tone as he did when he spouted deductions.

"Xenon, a colorless, odorless noble gas. It is used as a general anesthetic, which you should know given your qualifications as a medical professional. It is also used in arc lamps, which scientists use to simulate the Sun's warmth."

Sherlock approached John slowly as he spoke, keeping his voice low, and John shivered a little despite his anger at the power of that voice.

"In these lamps, the xenon gas has a temperature approaching that of the noon-day sun. It simulates the sun's warmth and light but it can never quite measure up to the real thing. So you see, John, cocaine is my xenon, and you are my Sun."

Sherlock reached out and gently cupped John's cheek in his palm as he spoke those last few words. John leaned into the touch automatically, unconsciously, sighing softly.

"Why would I settle for an imitation when I can have the real thing?" Sherlock murmured. John smiled at that and before he had made the conscious decision to do so, he was closing the gap between them and kissing Sherlock firmly. The detective made an approving sound and wrapped his free arm around John's waist, pulling him close. John's fingers tangled through Sherlock's hair as their mouths met heatedly, teeth tugging and tongues probing with gentle persistence.

John pulled back for air after a minute or two and murmured, "Throw away the drugs," as Sherlock kissed along his jaw.

"Of course..." his partner replied against his skin, "After..."

John smiled and pulled him in for another intense kiss before leading Sherlock to the bed, abandoning his suitcase and all thoughts of leaving the flat.

John smiled and pulled him in for another burning kiss before leading Sherlock to the bed, already undoing the detective's shirt buttons. Sherlock's hands had migrated under John's jumper somehow and they were caressing his chest and back and stomach, their fleeting touches leaving him gasping against his partner's mouth. He stripped Sherlock of his shirt efficiently, tossing it aside, and went to work on his belt and trousers. Sherlock moaned softly and broke their kiss to tug the jumper over John's head, casting it to the floor carelessly.

Once John dropped Sherlock's trousers and pants to the floor, the detective pressed himself against his partner. John gasped at the contact and wrapped his arms around Sherlock's torso, one hand caressing the muscles of his back while the other groped his arse. Sherlock moaned into John's mouth, pressing his erect cock against John's stomach. He would never get used to this feeling, John thought fleetingly, of Sherlock wanting him in this way. Sherlock, of all people, a man proclaimed everything physical to be "just transport". John shivered as said man trailed a hand down his spine, slipping it under his waistband with no shyness whatsoever.

"Lie down..." John murmured, pushing gently at Sherlock's chest. The detective reluctantly stepped away and laid on his back, keeping his eyes on John as the doctor stripped off his trousers and pants. When he was finished, he knelt on the bed with Sherlock, straddling his hips and leaning down for another heated kiss. He trailed his hands over Sherlock's chest, rubbing his thumbs against the detecctive's nipples and making Sherlock arch and moan softly.

John kissed down Sherlock's neck, sucking and biting at his pulse, determined to leave a mark. Now that they were together, now that Sherlock was his, he had to show the world that the detective was taken. Sherlock gasped under John's insistent mouth, fingers curling around his shoulders. He trailed one hand down John's back, short nails scraping against the skin and making John groan. As the doctor trailed his lips down to Sherlock's collarbone, he slotted his hips against Sherlock's, their cocks brushing and sending sparks of pleasure up John's spine. Sherlock groaned beneath him, the sound going straight to John's groin.

"John..." Sherlock whispered as the doctor rocked his hips, grinding them together.

"Mm...?" John looked up, drinking in the sight of his partner flushed and wanting beneath him. His pupils were so wide they had nearly erased the irises and John's fingers had turned his dark hair more unruly than usual. His kiss-swollen lips were parted slightly, soft pants escaping from them, and he looked utterly debauched. John moaned softly and leaned down, kissing him fiercely as he ground down against him.

Sherlock gasped against John's lips and returned the kiss eagerly. He had never felt so consumed by another person as he did when he was with John, when they were together like this, skin on skin. He had meant what he'd said earlier- John gave him a better high, stopped his brain more effectively than cocaine had ever managed to. His attention, the way he touched and kissed Sherlock, as though it was the only thing he'd ever wanted to do, was completely intoxicating.

When John pulled back for air, Sherlock murmured, "Want you... Now..." Normally, he would have been embarrassed to say something that came so close to begging, but he was too aroused to care at the moment. John moaned softly and guided Sherlock's legs apart, teasing a finger around his entrance. Sherlock arched at the touch, his hips rocking down in search of more of the sensation. Carefully, John slid his finger inside, watching as Sherlock's head tipped back in pleasure. He thrust in and out a few times before adding another and slowly working the detective open. Sherlock gasped and tried to despite the discomfort, his eyes slipping closed. John kissed him gently, licking his way into his partner's mouth and plundering it thoroughly. Sherlock slipped a hand into John's hair, relaxing into the kiss.

Sherlock forced himself to stay relaxed and let out a soft moan as the doctor slid another finger inside him. John began to thrust his fingers slowly and the detective rocked his hips, fucking himself tortuously on John's fingers. He let out another moan as John began to go faster, his lips leaving burning trails where they pressed against his neck, his collarbone, his shoulder. His partner's fingers brushed his prostate and Sherlock let out a surprised, pleasured noise.

"John... Now..." He panted, tugging at John's hips insistently.

"So impatient..." John murmured, smiling so Sherlock would know he was teasing. Sherlock merely growled in response and sealed his mouth over John's. He bit at the doctor's lips and thrust his tongue between them, licking at the inside of John's mouth, his need becoming harsher. John moaned into the kiss and removed his fingers, earning a whimper of protest from Sherlock.

John lifted one of Sherlock's legs, guiding it around his waist, and lined himself up with Sherlock's entrance. He pushed in slowly, biting his lip and trying his utmost not to come right there. When he'd pushed in as far as he could go, John rested his forehead against Sherlock's, panting, adjusting to the heat and tightness of being inside Sherlock. The detective wrapped his other leg around John and clenched his muscles, pulling John deeper and tightening around him simultaneously. John moaned loudly, his breath hitching.

"Sherlock... God..." He kissed his partner's forehead, his cheeks, softly, drinking him in. "You feel amazing..."

Sherlock exhaled, even his breath trembling with need. "Please... John..." he whispered.

John moaned and nodded. He withdrew some before snapping his hips forward and burying himself inside Sherlock again. The detective let out a loud groan, urging John on, and the doctor continued to thrust, trying to keep his pace even as the burning tension at his core grew. Sherlock started rocking his hips with John's thrusts, amplifying the sensations that were coursing through him. He looked up at his partner, catalouging every aspect of John in that moment. His eyes were half-shut and his lips were parted, allowing short, harsh breaths to escape and warm the air between them. His short blonde hair was slightly damp with sweat, the ends sticking to his temples. Sherlock trailed his hands up John's sides and he shivered at the touch, leaning down to press a soft kiss to the detective's lips.

John started thrusting faster, Sherlock moaning against his lips. He reached down and wrapped a hand around Sherlock's cock, stroking in time with his thrusts. Sherlock groaned and his hands tightened on John's shoulders.

"John... M'close..." he whispered, his gray-blue eyes hooded with lust. John moaned and adjusted his angle slightly, finding Sherlock's prostate. Sherlock groaned, a burst of pleasure travelling through his entire body. John thrust into him again and Sherlock felt his orgasm rip through him, leaving him breathless. His muscles clenched, tightening around John's cock and the doctor moaned his partner's name as he came inside him.

John rested his forehead against Sherlock's, both of them catching their breath. After a minute, Sherlock tilted his head and brought their lips together, softly, breathing John in. The doctor broke the kiss and smiled down at his partner, his eyes glazed with contentment.

"That was good..." John murmured.

Sherlock snorted. "As ever, your command of the English language is immense and versatile," he said with a small smile.

John rolled his eyes and murmured, "Tosser." He shifted, his softening cock pulling out of Sherlock, who made a soft noise of protest. John turned onto his side and wrapped his arms around Sherlock's waist, nuzzling his neck. The detective chuckled and snuggled close, allowing himself to bask in the peace John had created for him. John's eyes slipped closed and he breathed a deep, satisfied sigh.

"Love you..." he murmured, already drifting off to sleep.

Sherlock's expression turned soft and he pulled the blankets over them both, making sure John was well covered. "I love you too, John," he said softly. He kept his eyes open and watched John sleep for awhile before drifting off himself, warm and comfortable and loved.