Natsu and the gang were relaxing in a festive place in Magnolia, Natsu had gone out to walk around the town when he stumbled across Lucy and Loke who was on a job, his magic power seemed to get dimmer each time his scent seemed off to after Loke rescued her the two awkwardly at dinner and Loke said something to cause Lucy to punch him hard knocking his glasses off but Natsu heard everything was said.
When Loke was alone in a park he made his presence known "Good evening Loke" Natsu spoke with crossed arms.
"Oh hey Natsu" Loke smirked "I assume Lucy told you about my trick on her" he rubbed his head, Natsu just looked at him with a sharp gaze.
"A trick?, try the truth and joking about it" Natsu corrected "I heard your heart beat it never sped up when you said your dying" he frowned "I have a few suspicions about you, your magic is going out and your ailing health" he spoke "You need to tell Lucy the truth about you, Leo the Lion" he told him making Loke's eyes widen with shock.
Loke sighed no use lying to a Dragon Slayer "How did you find out?" he asked.
"Lets say seeing Lucy summon every spirit except a select few, wheres the third Celestial Spirit the Leader of the Kodiak Leo the Lion and I once saw you use golden energy the kind the Celestial's flash when they appear, it felt unnatural to be simple magic it was too ancient" Natsu told him counting off the keys "But when I saw you use it it faded away and your face contorted with anxiousness and you getting weaker and sicker each time, a big thing you freak when you see Lucy, a Celestial Wizard then I pieced it together" he said.
"Well your certainly observant and more aware" Loke sighed.
"thank Enhanced senses for that" Natsu smirked "and you didn't smell human even I noticed it way back then" he finished.
"Yeah I'm Leo the leader of the Celestial's" Loke admitted.
"You need to tell Lucy the Truth, she's nice and understanding she'll listen to you" Natsu stated sternly "Never be afraid to do the right thing otherwise, we will never be happy with our lives and will only live with regret" he said.
"You have a way with statements like those" Loke smirked.
"I only know these things because I have lived through them past and present, especially training with my Aunt, Uncle and Grandfather" Natsu told him.
"Alright I'll tell her, before I have to go" Loke said solemnly.
"Well whether you pass on or not, isn't up to me I was hoping to Spar with Leo The Lion" Natsu smirked.
"From what here about your magic powers and Strength I don't think I could defeat you" Loke scoffed.
Later Loke had told Lucy to meet him, he was standing by a grave with the name Karen printed on it, then Lucy arrived so exhaling he told her his story how he was a Celestial Spirit Leo The Lion and how he was cast out for killing his holder, as it turns out Karen was abusive towards her Spirits and his close friend Aries fed up with her abusive nature he confronted her and then went to earth refusing to help her unless she cut off Aries contract with her, weeks had past when he got the word Karen had been killed on a job past her pay grade and he may not have killed her physically but he got her killed for not helping her.
Loke made a grave where she was killed, begging for her forgiveness and wanted her spirit to be free, later he started to fade away with Lucy holding on to him she didn't care, then the Celestial Spirit King arrived and was ready to pass his judgement with Lucy standing up to the almighty Celestial King fearless and a shocking moment she summoned all her spirits a feat Karen could never do.
after consideration The Spirit King decided Loke could have second chance only if he protected Lucy to the end of his time and he could return back to the Celestial World.
Back at the Guild Lucy and Loke told the other's the truth.
"We had a Celestial among us this whole time and we didn't know" Gray spoke.
"I guess I figured it out when we switched bodies, something was off" Natsu admitted.
"Well atleast my body didn't feel like a Lava Pit and drooling fire was something I could do without" Loke smirked.
"When your a Fire Dragon Slayer, you need to focus on and keep the fire in your belly shimmering but not blazing and when it's time you can unleash a inferno" Natsu told him "why do you think I keep it on shimmer, I don't to burn the Guild or a house down" he said.
"Well it's good to know you'll still be around" Erza smiled.
"Aye sir" Happy agreed.
"Now if you'll excuse us we have to discuss our relationship as a couple" Loke smirked coyly and picked her up princess style "Also Natsu thank you showing the way and to do whats right before it's too late" he said.
"You have taking a step into a larger world my young Padawan" Natsu smirked making the group laugh.
"Shut up" Loke chuckled before walking out the door.