She mine

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Lucy, blossom and Happy's jaws dropped to the ground as they became pale. Their eyes bulged out with disbelief at Natsu's declaration. "DON'T BE RIDICULOUS/D'AHO!" scolded Lucy, blossom and Happy with horror.
"You'll be defeated instantly!" added Happy. Sting, Rogue, Lector and Frosch decided to watch the battle with the audience, who took a few steps back for a bigger battle ring.

Blue smirked at the pyromaniac's determination. "Alright, I accept your challenge." she said.

"Now I'm really on fire." he grinned when he noticed Happy dragging his bag away. "By the way, what are you doing, Happy?"

"Preparing to go back to the inn." he replied.

"That won't be necessary." said Natsu, cracking his knuckles. "It doesn't matter who my opponent is, even if I plan to make Blue my mate, I'll beat the crap out of her and make her scream in pain." For some reason, Sting and Rogue were fuming at his statement. He lit his hands with flames and grinned at her. "Let's go, Blue! I'm gonna show you how much stronger I've become in the last 14 years!"

The water Dragon Slayer held her hand up. "Wait a minute, Natsu." she said calmly. However, she was ignored as he charged towards her. "Calm down. I haven't warmed up yet. Are you even listening to me?"

"You can't just attack carelessly like that, you idiot!" scolded Lucy.

"That's right!" shouted Happy. "Blue is known for obliterating her opponents!"

Natsu tried to land a punch on her but she blocked the punch and with a blink of an eye, she released strong gusts of wind as a counterattack. When the dust was blown away, the pyromaniac was nowhere to be found. Happy and Lucy stared with horror while the Sabertooth members were surprised. "N-Natsu's gone..." cried the blue Exceed.

"No, I haven't!" yelled a voice from above. Without even glancing at the source, she blocked Natsu's attack with a stone wall. As soon as it went back to the ground, he leaped up and tried to punch her. Blue successfully blocked his punches and returned the favour by elbowing him in the stomach, punching up his chin and slamming his head to the ground.

"HE'S GETTING THRASHED!" screamed Lucy, Happy and Lector. Rogue and Sting watched the water Dragon Slayer with awe.

Natsu had a seriously look as he got back on his feet. He tried to land a kick on her but she blocked his foot with ease. She grabbed his ankle and thew him to the ground. 'Natsu's face...' thought Lucy with surprise. 'He's so serious, and yet...' At that time, the Fire Dragon Slayer got back up on his feet and had a happy expression. 'He's still smiling like it's nothing.'

"Fire Dragon's Roar!" Natsu released flames at her. Blue simply held up her hand and the attack was stopped. The Dragon Slayers' eyes widened with disbelief. She tilted her head up and opened her mouth. The flames were sucked in, which was odd because as far as Natsu and Happy knew, Blue did not know how to eat flames, especially his. But that was seven years ago.

Once the flames were gone, Blue slowly inhaled. "Fire Dragon's Roar!" she released blue flames back at him but double the amount. The Fire Dragon Slayer took heavy damage from the attack and fell to the ground, unconscious. Everyone, especially Happy and Lucy, gasped at this.

"Natsu...?" trailed off Happy with disbelief before he began to cry. "I don't believe it... That's terrible! You're gone too far! Natsu is...!"

"Hold on a minute! I'm not done yet!" Natsu jumped up and grinned at her. "Whew! Those flames were hotter than any flames I've ever eaten! Thanks for the meal! Though there was too much that were wasted..." He charged towards her and leaped up. "Crimson Lotus: Exploding Flame Blade!" He ignited arms and generated long torrents of flames from them, which moved to hit her in a spiraling formation. The attack generated a huge explosion and the brightness forced everyone to shield their eyes.