An- Artwork by ken.
Roaring from the skies did the siblings flew. The demon, unconcerned hummed out a "Who?"
"I am" Both bellowed out, their joint hands bashing into the demon's arm to shield their face from the attack, "The son/daughter of Igneel/Frost!!"
Their narrowed eyes upon the two, "Children of dragons you say?" Snapping in surprise at the sight of the pinkette before them and delivering a swift upper strike; sending them back from the powerful hit. The moment he touched the ground, he charged forward, "I'm takin' that book! And I'm gonna stop Face too!!"
"Ho?" Amused at Natsu's proclamation.
Blasting behind her brother, and held her blue translucent hand's behind his back; amplifying his speed with Hydro Charge. Rocketing at the man with a cry, "So you're goin' down!!"
Swiping their arms and bent in a swift motion, forefinger and middle pointed up, "Thorn Brambles!!" Torrents of thorns swopped out at the two. With Natsu's amplified speed of water from his sister and Koyuki's propelling speed with Hydro Charge, both were evading the thorns like nothing. Surprising the enemies at such thing from such sight. Pulling his flaming fists, "Fire Dragon's" Connecting the demon's cheeks "Iron Fist!!!"
With such attack, the enemy shielded the book with both arms from the flames, flying off within seven meters. On the ground, propping themselves up and suddenly smiled strangely. Unnerved at the man's silence and making faces, as if communicating with someone, which he just might if he continued to make such facial reactions. Propping up to standing before the two Polar siblings. Tensing into battle stance at the smirk the demon gave, "What is he smiling about?"
"Don't know, but be ready, Koyuki." Nodding at his words in agreement and understanding, "Got it. Natsu."
"Let's do this!! Koyuki!! Igneel!!" Both siblings rushing in at the man once more with winds blown behind them at their speed.
"Such fervor. You both think far too highly of yourselves" Snapping their eyes to reveal their narrowed pupils, "Humans!" A heavy force fallen above them, "What irritates me, Mard Geer, is dragons. You are beneath my notice." Yet both evaded on different sides of the ball of energy that cratered the ground where they once stood. Fire burned from the soles of his feet and swiped from above, however it was grabbed easily by the demon. Smirking down at the stunned Dragneel, "And you are no dragon."
"Don't you dare--!!" Both crying out in shock, the ground beneath them caved in and fell. Falling deeper and deeper the temples depths; peeping out when Natsu grabbed her upper arm and pulled her against his chest. Not seeing the small chip of her hair gone. Taking the brunt of smashing through the rubble. Azures widen at the sight of the demon falling a distant away, "Begone! Children of dragons!" conjuring more thorns at them, prone to be hit by the sharp thorns itself, "Thorn Brambles!!"
"Dammit!" Shielding Koyuki's head from hitting the thorns. Looking up to her brother in worry, "Natsu!" Gasping when the vines sliced into piece and two figures appeared. Recognizing them as the members of Sabretooth and the Twin Dragons: Sting and Rogue.
Both broadly smiling at the sight of the Third generation Dragon Slayers, "Sting! Rogue!"
The pale blonde smirking to the two, "Long time, no see, Natsu--" Finally realizing who the female was and their pale baby blues dilating in stunned surprise, "Koyuki..."
Even Rogue was openly stunned in shock at the sight of the mage, "Koyuki..." Wheezing out in utter shock at his partner's bluntness, "Whoa! You grew into a hot babe now. You're single, right?" Snapping at the pale blonde, "Sting!!"

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Monstrous Hero- My Hero Academia x Fairy Tail (Oc)
FanfictionKoyuki Dragoon is an Ice and Water Dragon Slayer and a mage of Fairy tail. Her dragon parents disappeared the same year as every dragon, year 777. After being discovered and adopted by the Fire Dragon Slayer, Natsu Dragneel, her whole life changed...