I… have nothing to say here aside from Read the ANs, they exist for a reason. Oh and I forgot to mention that Natsu gave Jack one of the two scarves.
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"Fairy Tail has come calling!"
The entirety of the guild charged, ready for revenge. Jack and Natsu found themselves surrounded mages, who shot fire spells at them. But seeing as they are both fire dragon slayers and princes, they ate the flames, scaring the mages around them. "Oh now I got a fire in my belly!/I'm burning up now, who's first?" The two slayers shouted in perfect sync. Jack looked at Natsu and nodded, and fire dragon slayer spell circles appeared on their fists. "Fire dragon wing attack!" They shouted in unison. The two spells sent all nearby Phantom members flying through the air. Suddenly, Jack smelled something, something similar to a thunderstorm. He looked around, then up to see a human form in a cage, and Jack could feel the dragonslayer magic from them. "Macao, Wakaba! We got a caged dragonslayer in the rafters that needs evac!" Jack shouted to the pair. They looked around until they saw the mystery slayer. Macao hit it with some purple fire bolts, releasing the form from their prison. Wakaba grabbed them with his smoke and brought the form near him and Macao. The fire mage grabbed them and began the run back to the guild hall.
'BANG!'
Jack turned around and saw master Makarov walking through the door to the staircase. 'And enter Gajeel in three… two… one…" Jack thought to himself. As if on cue, Jack saw Elfman go flying, and his brother uses him as a springboard. As he walked near, Jack overheard the argument between Natsu and Elfman. "Hey bro, mind sharing this dance with me?" Jack asked as he stood next to the punch-happy Pinkett. Gajeel looked at him confused, probably not recognizing him. He shook off his confusion and punched at the brothers with his iron dragon clubs. They both caught them, but while Natsu heated his up, Jack actually got it to begin to melt, causing Gajeel to groan in pain. He crushed it a little, as flames manifested on his forehead, and solidified, for lack of a better term, into a circlet. His normally blue eyes became orange and reptilian, giving them the look of a dragon.
"Now normally, I reserve this form for desperate measures, but it is the duty of a prince to protect those that will be under his care." The dragonslayer said, a grim look in his face.
Jack got a better hold on Gajeel's iron dragon club and swung him into the wall, logging him in it. "Royal fire dragon's roar!" The stream of fire enveloped the iron dragonslayer, not destroying the wall upon Jack's will. When the spell ended, Gajeel fell to the floor smoking, barely awake. It was then master Makarov fell from the top floor. Erza and Jack ran to his side and saw his sickly green skin. "Everyone back to the guild!" Erza shouted. All the Fairy Tail members began to run, except Natsu. "Come on Erza, we gotta make them pay!" Erza put a hand on his shoulder and gave him a look. It was a pleading one, and it told Natsu everything he needed. And so, the trio of Erza, Jack, and Natsu ran.
(An hour later, Fairy Tail guild hall.)
The Fairy Tail guild's morale was low. Their master was bedridden, the Guildhall was trashed, and a lot of them were injured. Natsu had arrived a few minutes late, a crying Lucy in his arms. She explained her situation to the guild, and asked them to just hand her over, but this idea was shot down almost instantly. "Hey, Jack, what was that second form you went into?" Natsu asked. Everyone got a little closer, curious about it as well. Jack sighed and began explaining. "That was our fire dragon prince mode. All slayers trained by royalty in their category has it. Igneel just repressed your memory of it, as if you're not ready for it, you go full megalomaniac, and the only mercy for it is death. But, I do believe you are ready." Everyone nodded in understanding, but paled at the thought of an even more destructive Natsu.
Jack walked up to Natsu and put his hand in front of his brother's forehead. A dragon slayer magic circle appeared. "Dragonslayer secret art: memory block: remove block one: passcode: king's reign." Jack said, channeling his magic into the words. The magic circle glowed, then disappeared. A few seconds later, a fire circlet appeared on Natsu's head and he opened his eyes to show them in a black and sulfur yellow pattern. "You still with us Natsu?" Grey asked uncertainty. Natsu nodded, and grinned widely. "Yeah, just needed a second to get used to the memory and power surge." The pyro explained as he deactivated his prince form. It was then the person they saved from the Phantom Lord guild hall approached.
She was a girl at about five foot nine, had jet black hair, emerald eyes, and fair skin and was wearing a black t-shirt, worn blue jeans, and tan combat boots. She opened her mouth to say something, but stopped when she and Jack made eye contact. Their eyes became reptilian and their canines sharpened into fangs. They got extremely close, and bit each other in the neck. From Jack's bite, came a red dragon head surrounded by crimson flames and a crown on its head. From the girl's bite, was an orange dragon with yellow lightning surrounding it. Both gained streaks of the other's hair color in their hair. The two pulled back, and their eyes and teeth returned to normal. "Huh, so I'm destined to spend the rest of my days with you, cool. Anyways, I'm Sarah Thunder, the lightning dragon slayer." The now named girl said, the new couple completely oblivious to the stares of the guild at the moment.
Jack then choose that moment to look around. Upon seeing all eyes upon them, he sighed and started to explain. "That was the typical dragon mating ritual. Unless the dragon or dragon slayer doesn't have teeth yet, the mates mark each other with the face of a dragon of their element, and a crown if they are royalty. Dragons have one mate that is destined since birth, and will seek them out once they come of age. Dragons marking each other is basically marriage. It's the same for dragon slayers, but we get some of the other's hair color, we can use and eat the other's element, and we can do things like unison raids with no problem." Everyone nodded in understanding. Seeing how it was late, everyone went home, Jack and Sarah staying at Lucy's home. But Jack walked right into a meeting, but that's a story for a later date.
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Yeah I know, short chapter. I was losing the want to keep working on it so I wrapped it up before it never got finished.