Hello! Here is my first Fairy Tail fanfiction, Mine.

Title: Mine

Rating: M

Genre: Romance, Angst, Horror

Summary: I've been noticing strange feelings rising within me whenever I saw Natsu. Something about that strong and resilient body...I can't help it. I watch his every move, and I just want every part of him to be mine. Only mine. No one can have him. He. Is. Mine.

Author Notes: Yandere!Gray. My first time writing something like this, so bear with me. This will get darker as the story continues on, which is why this is rated M from the beginning.

Enjoy!

Chapter One: Prologue

He's yours. No one else can have him.

"Oi, Gray!"

I was torn from my thoughts as the loud and clear voice of the Dragon Slayer heading towards me cut through the chatter accumulating around me.

Fight him. Dominate.

Heat wafted towards me, sending a surprisingly thrilling burn over my skin. I frowned and spread the icy aura around my body out further, shifting in my seat as I turned to face the salmon-haired man.

Natsu was grinning wildly, fangs bared as Happy lingered in the air near his right shoulder. Cana glanced over from her seat at the bar and sighed, shaking her head and gulping down more of her booze.

"What, flame-brain?" I turned to stare at him, feeling the beginnings of a headache starting already. Honestly, I had to suffer from migraines every day just talking to him.

My hands twitched, and fingers yearned to tangle in that rosy hair...

"Erza, Lucy, Happy, and I were looking at new job requests. We want you to come." The idiot was grinning widely, laughing as Happy chattered on about how much money they would make and how they would split it—specifically for him to buy endless amounts of fish.

I sighed, rising to my feet as I stretched. "If it means keeping your butt out of trouble, then I'll come."

"Eh?" Natsu glared at me, dark eyes narrowing. "That supposed to mean something, droopy eyes? The heat surrounding him rippled and flared out. Pain stabbed through my head and I hid my wince as I butted heads with the Dragon Slayer.

"What do you think it means, flame-brain? Has your fire finally melted your pitiful excuse for a brain?" I reached for my own magic, channeling the icy energy through my veins. "Or are you just that stupid?"

"I dare you to say that again!" A boiling heat was radiating around the slightly shorter male, and his pupils thinned in his rising anger as a sound similar to a snarl rumbled in his chest.

Good. Make him angry. Make him fight.

"Or what? You'll melt me to nothing but water? Or will you cook my body to ash?" A deep aching exploded in the back of my head—it was as if it was protesting against my need to fight the bastard in front of me—but I clenched my teeth and loomed over him, burning cold vapor forming around me.

Overpower. Do it. Do it now.

"That is enough!"

Erza's powerful voice echoed throughout the room as she appeared with one of her hands on her hips. Her massive luggage cart was behind her, the steering handle in her other hand.

Both Natsu and I recoiled, eyes wide and bodies tensed. "Aye, sir!"

Her eyes narrowed as she glared down at us. "I don't want any trouble from either of you, got it? We all need this, specifically Lucy so she can pay her rent."

"Well, Natsu's going to rush in headfirst, so we'll be there to stop him." I ignored the dragon mage's outraged cry and turned to head out of the guild.

I was stopped by a hand on my shoulder. Erza stood beside me, her usually stern face softened into something like concern.

Get off. I don't want you. Nasty hands.

"Gray, are you feeling okay? I sensed an unhealthy spike in your magic levels when you were fighting Natsu."

The throbbing in my head screamed, but I ignored it and nodded at the older woman. "Yeah, I'm just tired. And Natsu's as annoying as ever—that alone will drain anyone."

Drain him. Drain him. Not her. You want him.

Titania tilted her head but seemed to accept my excuse, turning with an elegant grace and power. "Get some sleep on the train. You need to be at full strength."

"Mmm-hmm." I watched as she headed away, dragging the luggage cart behind her. Natsu groaned as Happy pulled him along down the road towards the train station, raising his voice over the complaints of the dragon mage. Lucy was beside them, trying to comfort the dragon wizard as he became nauseous at the thought of having to ride transportation.

I want him.

I sighed and ran a hand over my face, sweat trickling down between my shoulder blades as my chest tightened. I cringed and placed a hand against my throat, grimacing as I attempted to refocus my magic. It was hot enough outside that it was beginning to break through my cold exterior—something that did not happen often. It was making my headache worse, and I knew that I would be going to sleep tonight with a migraine.

With a huff, I straightened my shoulders and followed the rest of my team, putting my pain aside.

"Kill me...already..."

"For the love of God, if you don't shut up, I'm going to come over there and knock you out!"

Pin him to the ground. Show him who's in control.

The Dragon Slayer looked up at that, locking his narrow gaze onto me. "What'd you say?! You wanna fight?!" He jumped to his feet, his fists exploding into flames. I remained in my seat and watched as he gagged and wavered on his feet, collapsing to the floor.

"Tch. Typical bastard." The aching in my head decided to voice its presence, and I pressed my lips together and shut my eyes, leaning my head back to rest it against the seat. "Can't depend on him for anything..."

He'll writhe and moan. Beg for more.

You know he will.

Erza did not comment on my jibe, instead shoving me roughly in the back. "Go on and head to your room. You and Natsu will be together with Happy. Lucy and I will room together."

I forced myself not to roll my eyes in exasperation. Just wonderful. I would be spending a six-hour train ride with a Dragon Slayer who vomited every two seconds.

Just my luck.

... ... ...

Someone was shaking my arm insistently, tearing me from the deep and endless darkness that was sleep.

I groaned and cracked open an eye. "What?"

Lucy was standing over me, her large brown eyes bright and holding concern. "Gray, are you alright?"

"What?" I sat up abruptly—how had I ended up on the floor?—but the pain in my head roared. I flinched and brought a hand up to my forehead, feeling the sweat drenching my skin. "Crap. Damn it all."

"Gray, what's wrong?" The celestial spirit mage's eyes were wide, and her brow furrowed in her rising concern. Her hands slipped into mine as she helped me stand. I unintentionally drew back as her fingers trailed over the damp skin of my palms. "Why are you warm?"

I scowled and pulled away, attempting to use my powers to cool myself off. I was hot. That rarely ever happened. "Where's Natsu?"

"Outside. The train stopped a while ago." Lucy was staring at me with an intensity that made me uncomfortable.

"Gray." Erza appeared in the doorway, a pillar of scarlet power as the light in the hall enveloped her frame. "What's going on with you?"

I bit the inside of my cheek as Titania's booming voice did no good for my aching head. "Just let me sleep." I turned away from both of them, closing my eyes again as I rested my forehead against the cool glass of the train's window.

"Hey, Gray!"

I jerked away from the window as something large collided with it, rattling the glass panes. Natsu had his face smashed against the glass, and with a grunt, he pulled himself back and glared at me.

"Get your butt out here! We still need to finish our fight!"

Unnatural heat enveloped my frame, and I failed to restrain a shudder. Something about fighting with the Dragon Slayer was unappealing at the moment.

No. He's mine. Ours. Mine. Ours. Mine. Ours. Mine. Ours. Mine. Ours. Mine.

Truth be told, I knew there was something wrong with me. My head was pounding, my stomach had decided it was going to complete a hundred backflips as fast as it could, and I was hot. Sweat was covering my body, and even though I had stripped long ago, the fire that was holding me captive refused to let go.

"The train's about to leave the station," Lucy informed me, her voice soft and soothing. "Come on. We need to get you out of here."

"Hey, what's wrong with Gray?" Natsu jabbed a finger over his shoulder, motioning back to the ice mage trailing them.

"I think he's coming down with something." Lucy spoke from beside the Dragon Slayer, running a hand over Plue's head. "He's running a fever. I felt it on the train—he was hot to the touch."

Natsu whipped around with a dangerously sly grin on his face. "Is the little popsicle not feeling well today? Do you need to go home and lie down?"

Gray scowled, clenching his hands into fists. "Not now, Natsu." His voice was dark and weary, holding an endless exhaustion. "I don't have time for your crap."

The Dragon Slayer frowned, tilting his head. "You're refusing to fight? Aw, you're no fun anymore!"

A faint flush appeared on the ice wizard's face, and he pressed his lips together.

"Hey, Gray? What are you—Gray!"

At Natsu's cry, Erza and Lucy turned to see the Ice Make wizard fall to his knees, his hands wrapped around his throat as his eyes widened.

"Gray!" Erza and Lucy rushed over, Happy flying behind them.

Erza knelt at the cold wizard's side, putting her hands on his shoulders and stopping him from writhing on the ground. "Gray, can you speak? What is wrong?"

Dark eyes shot open, and then the Ice Make mage was lurching off of the ground, heaving his weight and pinning the Requip mage to the ground. His hands wrapped around her throat, effectively cutting off air flow before she had a chance to react.

Natsu growled, eyes flaring dangerously bright as he tensed. Flames ignited around his hands, and he bared his fangs. "Gray! Let go of her, you droopy-eyed bastard!"

"Natsu!" Erza fixed her dark glare on the Dragon Slayer, stopping him in his tracks. "He's not hurting me. Look at him."

The salmon-haired man calmed down somewhat, narrowing his eyes as he glared at the dark-haired mage. Gray still had his hands wrapped around Erza's throat, but there was no pressure or strength put behind the attack. The wizard was trembling, his muscles rippling beneath his pale skin. His eyes were dark and glazed, strangely dark.

Gray turned his head to stare at the Dragon Slayer, and a heavy and unsteady breath escaped his throat.

"Natsu..."

Before either of them could respond, Gray's eyes rolled back in his head and he collapsed.

So what's going on, you ask? Answer: Gray is developing unhealthy feelings for Natsu, and right now, it's affecting his physical and mental health badly. He may or may not get better.

So this is just a taste. The way I'm setting this story up, this chapter is actually what happens later on, and the background building up to this will be explained in detail in the chapters to come.

Updating depends on the support I get for this! :)

R&R, pleaze!