SailorStar9: Another wrecked-up idea my plot bunnies gave me when I was watching Shingeki no Kyojin for the third time. Hopefully no one will find this fic weird.

Plot summary: Humanity's hope for survival increases up a notch when the Four Celestial Avatars awaken. Mavis Yeager; Avatar of the Celestial Spirit Genbu, older sister to Eren and partner to Levi in every sense in the world... she is also the first of the four Celestial Spirit Avatars to awaken.

Pairings: Established Levi/Mavis. Hinted Eren/Misaka and whatever cannon pairings there are.

Disclaimers: I own absolutely nothing.

Prologue: Five Years Earlier

"Mavis," Keith looked at the Avatar in his office."What happened out there?"

"Genbu happened." Mavis replied. "I feel... more of its powers manifesting." she frowned, fingering the obsidian bracelet on her wrist. "Not only has my control over water increased, I also find myself able to create ice. Keith-jiji, if things continue as it is now, I'm afraid I might lose control over my powers and harm the Squad... permanently. Not only that, Genbu has also informed me that the other Avatars have also awakened."

"I see." Keith nodded, clasping his fingers together. "You want time off; not only to train to control your enhanced powers, and also train the other Avatars, right?"

"And that's why you're the Survey Corps Commander." Mavis grinned.

"Soon to be retired Commander, anyway." Keith grinned back. "Go wash up and grab some sleep."

"Will do." Mavis saluted.

"Mavis, what..." Erwin started, spotting the water Elementalist in the corridor.

"Like I just explained to Keith-jiji, Genbu happened." Mavis rolled her eyes. "Erwin, look. I'm pretty tired right now, not only by taking out the Aberrant with my 'Water Scythe', but controlling the rainstorm also took a lot out of me. So, right now, what I want to do is get a cool shower and some sleep. Good night."

"Seriously..." Mavis muttered as she headed over to the showers. "Just because I'm the Genbu Avatar doesn't mean I can control rainstorms at will."

"You know complaining won't do you much good." Levi pointed out, outside his battling partner's door.

"Not in the mood right now, Levi." Mavis warned. "And since you're so free, hold this for me." she tossed a bottle of massage oil to him.

"Will we be using this tonight?" Levi smirked suggestively.

"Perhaps." Mavis shrugged.

"Know what, I changed my mind." Levi's smirk widened. "I say we shower together."

"Didn't you take a shower within an hour after getting back?" Mavis reminded. "Forget it." she sighed, already used to her partner's habits. "And Ackerman, whatever you're thinking, not gonna happen." she retorted, slamming the door to the female showers shut.

"Right..." Levi muttered.

"Mavis...?" Levi stifled a yawn when he stirred from the bed he shared with his partner the previous night, only to find the water wielder gone and a folded letter on the side table. "A training mission?" he growled. "And she didn't bother to tell me?"

SailorStar9: Any OOC-ness is regretted. *Sighs* Don't you just hate plot bunnies sometimes? Read and review.