Originally this story was only going to be a few chapters long and include some kind of character arc for Natsu about ~coming of age~ but that kind of got lost somewhere in all the crazy bullshit. Oh well :3

It had been a few weeks since Natsu's uncontrollable heat had started and it hadn't lessened at all. His cock and balls were constantly aching from over-expenditure yet he was still horny all the time as well. He sat in the guild hall, slumped over at the bar, contemplating his predicament and whether or not he would ever resolve it. Mirajane, the usual barmaid, was not present so Natsu had helped himself to a few drinks in hopes that it would ease some tension.

'Still havin' problems?' Natsu turned around to see Gajeel standing behind him with a smirk on his face, 'How 'bout we go to the back room to let off some steam?'

Natsu didn't know whether the iron dragon meant fighting or sex, but he didn't really care and agreed either way. They, very unsubtly, walked to the back room together and went inside. To their surprise though, the room was not empty.

Mira stood menacingly in the center of the room, holding a leather whip. Erza was at her feet, on her hands and knees and wearing a very revealing maid's costume. What on earth had they walked in on?

'Natsu! Gajeel!' Mira said with surprise and then winked at the two men, 'Good timing.'

The two dragon slayers exchanged a cheeky grin with each other and then turned back to Mira, 'Can we join?'

'No way!' Erza spat indignantly, although she hardly looked to be in a position of authority.

Mira glared at the other woman and she bowed her head and apologized. Was this really the same fierce amazon that had abused and humiliated Natsu that time in the Magnolia fields?

'How about a little friendly competition?' Mira suggested with her trademark giggle.

'You're on!' Natsu agreed, not even thinking about what the competition might be.

'The rules are simple,' the eldest Strauss sibling began to explain, 'We'll be in pairs and whichever pair gets off first wins!'

Natsu nodded eagerly, 'I want Erza!'

Mira giggled again, 'I don't think so. Erza is MY devoted servant after all,' she said, stroking the other woman's gorgeous red hair, 'It will be boys vs girls. You in?'

The fire dragon scowled but agreed nevertheless, 'Tch, fine.'

The iron dragon slayer was less sure. As much as he loved a good competition, he didn't quite trust the she-devil and wanted to get all the information first.

'What's the prize if we win?' he asked.

'Us, of course,' Mira responded simply, 'But if we win, you're ours.'

Gajeel thought about it for the briefest of moments, but was confident he and Natsu could out-perform the two girls, 'Agreed.'

'Very well. Let's go!' Mira chimed, signalling the start of their competition.

Not wanting to waste any time, Natsu grabbed Gajeel by the shoulders and pushed him roughly against the floor. They both started shredding each other's clothes and tossing them to the side so that they were both naked. Meanwhile, Mira had climbed on top of Erza so that their heads were aligned with each other's groins. They slid down each other's underwear so that their bare vaginas were exposed.

'No time for lube,' Natsu told his partner, 'I'm gonna fuck you raw.'

Gajeel growled but didn't object as Natsu lifted up his legs and put them over his shoulders. He felt his fellow dragon's cock press up against his entrance and force its way in. His dry ass resisted the intrusion but Natsu did not relent until he was buried inside. He started moving his hips back and forth, fucking the older man roughly and making him grunt in pain.

Mira rolled her eyes, 'Boys and their fucking. There are other methods, you know?'

To demonstrate her point, she poked her tongue out and started licking at Erza's folds. making the red-haired woman moan and start licking back. They lapped at each other's clits while rubbing their hands up each other's thighs and over their slits. They inserted their fingers in to each other's pussies and rammed then in and out, moaning in unison as they did so.

'Jack yourself off!' Natsu ordered.

Gajeel did as instructed, wrapping one of his hands around his large cock and rapidly stroking it while Natsu continued to fuck his dry hole. His insides were stinging like crazy and he was sure something had torn from the course fucking, but he didn't care at that point. Spurred on by the sexy moans from the girls, both boys groaned as they felt tension welling up inside them. They were close.

Mira and Erza could tell the guys were almost finished from the sounds they were making so they decided to step up their game. The used one hand to circle each other's clits, while tongue-fucking their pussies and then using their free hand to jam two fingers up each other's anuses. The triple impact did the trick and soon enough, they were both orgasming, cumming with loud shrieks over each other's mouths.

Natsu and Gajeel came shortly after - the iron dragon blowing his load over his chest and stomach while the fire dragon blew his inside his partner. They were too late though and they both reluctantly turned to face the victors with grimaces on their faces. Mira's response was, of course, a giggle and even the stoic Titania emitted a small chuckle.

'First thing's first,' Mira stood, helped Erza up and then looked down at the boys, 'you need to put your new outfits on.'

Two maid costumes were thrown at the naked boys and they both growled spitefully. They had lost fair-and-square however so they got to their feet and did as asked. The clueless men struggled immensely with the lacey, far-too-small garments but eventually managed to get them on and then stood before their new mistresses.

The two S-class wizards burst in to laughter at the sight, making the dragon slayers flush red with embarrassment. The skimpy black dresses did a poor job of covering the men's large chests and dangling genitals. They both looked completely ridiculous and rather pathetic - exactly as the girls wanted.

After a minute or so, Mira managed to suppress her laughter and spoke up, 'I think us girls should show you guys how to really fuck someone.'

Both women stripped off so that they were only in their underwear. Mira was wearing a matching pale pink bra and thong, while Erza was wearing a similar baby blue bra and thong. Then they grabbed two large strap-ons from nearby and attached them to themselves with devilish smiles on their faces.

The dragon slayers exchanged a look of fear before they were re-positioned by the girls. Gajeel was made to lie down on his back with Natsu on his hands and knees on top of him, their faces buried in each other's groins and their rear ends exposed.

'Starting suck each other,' Erza commanded.

Mira giggled in affirmation and then added, 'We'll prepare your holes.'

Erza grimaced, 'I am NOT licking their filthy asses,' which made both dragon slayers chuckle a little bit.

'Of course not,' Mira shook her head in disgust and produced a bottle of lubricant, 'we'll use this!'

Natsu was surprised they were getting "prepared" at all, but Gajeel was thankful after the brutal fucking he had just received. As they started sucking each other's monster dicks, Erza and Mira pressed some of the sweet-smelling lubricant against their entrances. They then lathered a generous amount on their cocks cocks and moved in to position.

Mira knelt behind Natsu and pushed her black strap-on into his hole with ease. On the other end, Erza was kneeling behind Gajeel and slid her red strap-on into his already-beaten hole. They both started moving in tandem, thrusting the fake cocks in and out of the two men.

Natsu and Gajeel moaned in to each other's dicks as they sucked each other off, drool escaping from their mouths and running down their shafts. Both men could feel their inner walls being stretched apart by the girls and shivered with desire as the plastic cocks rubbed against their prostate glands. It wasn't long before they were cumming in to each other's mouths, their sphincters clamping around the strap-ons inside them as they feed each other their dragon slayer seed.

The women pulled their cocks from the boys' asses and Mira asked, 'You liked that did you?'

'Of course they did,' Erza answered for them, 'They're cock-loving fags after all.'

'Then why don't you suck our cocks too?' Mira asked, moving her fake dick down from Natsu's ass to Gajeel's cum-stained mouth.

Erza did the same, pushing her cock in to Natsu's mouth and making him suck on it. The two women laughed as the boys swallowed the toys hungrily, like cock-whores that Erza claimed they were. The taste of each other's asses was mostly over-powered by the floral flavoured lubricant, much to the two filthy men's dismay.

Once the plastic cocks had been sufficiently cleaned, the girls got up and removed them. They allowed the boys to get up too, as they pondered what to do next. Mira picked up the whip she had discarded earlier and twirled it around in the air. The usually fearless dragon slayers gulped as the eyed the silver-haired woman with concern.

'You know, when you two walked in, I was just about to punish Erza for being naughty,' she said, stretching the leather weapon out threateningly, 'Perhaps we should continue where we left off?'

The boys sighed with relief while Erza gasped in shock, 'You traitorous bitch!'

Mira let out another giggle, 'They don't call me the "she-devil" for nothing,' and then ordered, 'Get her, boys!'

Natsu and Gajeel grabbed Erza before she could get away and forced her on to her hands and knees. Mira moved in behind her and commanded the guys to remove her underwear. They did so, revealing the red-haired woman's plump ass. The she-devil smiled.

'The mighty Titania at my mercy,' she mocked, 'I guess this makes ME the true queen of the fairies!'

With that, she cracked the whip against Erza's ass, making the woman shriek in pain as an imprint as red as her hair was left on her cheeks.

She gathered herself and then said sternly, 'A true queen has honour and respect - you have neither!'

Mira scowled and whipped her again but this time she made no sound.

'Boys, I think you ought to show the former queen some respect,' the usual sweet tone in the barmaid's voice had been replaced with a cold and unforgiving one.

Natsu and Gajeel were more than happy to oblige, moving to opposite ends of the warrior woman and man-handling her so that she was in the right position. Natsu bent down and flicked his tongue at her asshole, sliding the wet muscle inside and wriggling it around, while Gajeel rubbed his cum-covered cock and balls against her face. Erza made no sound nor movement and merely sneered at the assault from the two boys.

Natsu got rock hard from the taste of his teammate's ass and couldn't wait any longer. He moved back in to a kneeling position and pushed his cock into her tightest hole. He had been waiting to fuck the bitch anally since their first encounter and was overjoyed to finally be doing it. Meanwhile Gajeel had pried Erza's mouth open and forced his cock inside, pushing it all the way down her throat. She gagged at the intrusion and coughed up saliva all over his dick.

The sadistic Mirajane giggled once more as she watched, 'What a worthless bitch you are - letting yourself be used by two inferior men like this. I thought you were better than that.'

Erza had nothing to say in response (not that she could speak even if she wanted to) as she had been overwhelmed by the power of the two cocks. She was now desperately sucking Gajeel's enormous pole while pushing her ass backwards to meet Natsu's thrusts. The two dragon slayers looked at each other and smiled, high-fiving over Erza's body as they spit-roasted her. Cheered on by Mirajane, they fucked the woman between them harder and faster until she was moaning with ecstasy into the cock in her mouth.

'Cum inside her, boys,' Mira instructed, 'Use her like the slut that she is.'

But they didn't have to be told. With a few more powerful thrusts each, they hit their climaxes. They roared in unison as Gajeel sprayed his seed down Erza's throat and Natsu unloaded into her ass. She continued to moan as two of her holes were filled with hot, sticky cum. Once they were done, both men pulled out and fell backwards on to their asses, panting heavily to catch their breath.

'Oh, you're not done, are you?' Mira said sadly, 'Because I haven't been fucked at all yet.'

Both dragon slayers were totally spent after their third consecutive orgasm, but moved towards Mira nevertheless.

'I've already had your cock once,' the take-over mage waved at the fire dragon dismissively, 'This time I want Gajeel's.'

She gripped Gajeel's shoulders and pushed him against the ground. She bobbed down between his legs and sucked on his weeping cock which already rising to the occasion. When he was fully erect again, she climbed on top of the iron dragon slayer and sat down on his fat dick, devouring it with her pussy in one swift movement. Gajeel moaned as she clamped herself tightly around his pole and started riding it.

Not content to just watch, Natsu moved over to the fucking couple and positioned himself behind them. Without warning, he jammed his rod into Mirajane's ass, surprising her and making her shout out loud. His cock was sufficiently coated in cum that he moved it in and out relatively easily. He wrapped his arms around the older woman and took hold of her large breasts, squeezing them tightly. He could feel Gajeel's cock through her inner wall as they both fucked her in her two holes.

The disgraced Erza decided to join and climbed to her feet. She stepped over to the threesome and lowered herself over Gajeel's face, feeding the iron dragon her completely soaked pussy. He ate it hungrily, lapping up her juices and savouring the taste in his mouth.

Mira started rubbing her clit as she moaned loudly from the double penetration. Erza did the same, while also kneading her own breasts with her hands. Natsu relinquished one hand on Mira's tits, instead slipping it between Gajeel's legs underneath him and sliding a couple of fingers into his hole. He groaned at the sensation, dizzy from arousal with Mira riding his cock, Erza's dripping pussy in his mouth and now Natsu's fingers in his ass.

They fucked like that for a while until none of them could hold it in any longer. Mirajane was the first to arrive, overwhelmed by the two cocks ramming in to her at once. She clenched around their dicks as she came, making them both cum too. They both groaned as they shot their loads inside the she-devil. Erza came last, squirting into Gajeel's mouth as he tongue-fucked her.

All four of them collapsed into a pile on the ground, unable to speak, move or even think for at least a minute or two. Suddenly, the door swung open and somebody walked in.

'Master!' Erza shrieked.

'Gramps?' Natsu quickly sat up and looked towards the door.

Master Markarov was indeed standing there. He looked completely unphased as he eyed the foursome, as if he hadn't quite registered what was going on. Nobody said anything to him, all completely paralyzed with fear.

The guild master stared at them in silence for a brief moment that seemed like an eternity and then he finally spoke, his voice loud and booming, 'WHAT THE HELL DO YOU THINK YOU ARE DOING!? EVERYBODY IN THE ENTIRE GUILD CAN HEAR YOU! GET SOME GODDAMN DIGNITY AND KEEP YOUR SEX LIVES TO YOURSELVES!'

Four weak whimpers of 'Sorry, Master,' was all they could muster in response...

Next time: Fire, Ice and Water collide as Natsu gets in the way of Juvia and her beloved.