Hiro Mashima owns Fairy Tail

A NEW DRAGON SLAYER

He saw everything, heard everything, and knew this girl had a lot of heart to have survived the things she had. "Little Princess we will serve you, Seiryu will turn you into the Celestial Dragon Slayer, and you will protect your loved ones." The three keys levitated and appeared in her hand, the key head had the beast decorating it and the keys glowed as if they were made of starlight.

Byakko chuckled and Lucy watched them vanish, the water rushing back in, and she quickly drew on Hydra's power and called Fornax before navigating her way out and swimming to the top of the lake. As she returned to the shore Acnologia helped her out, arms crossed, and she showed him her find with a cheeky grin.

"Ah, impressive."

Without hesitating she called on Seiryu, watching his golden form spiral into existence, and he studied Acnologia with a snort of amusement before turning to his human. "I will initiate the bond between Dragon and Slayer." As he said this his form shrunk, forehead connecting with hers, and she felt his magic brushing her own; it was a bonding of souls, on a spiritual level, and as his magic surrounded her own she allowed him to see and feel her own soul.

Acnologia watched as Lucy began to glow, scales of soft gold running down her arms and legs, and then the dragon features faded and Seiryu pulled back. "With me being a Celestial Spirit you do not have to fear becoming a Dragon, Lucy, for our soul bond allows me to prevent such things." Acnologia nodded and stepped back, it was time to let Lucy begin the training with her dragon.