Alternate Universe: Zack survived and was there during FFVII. Aerith doesn't die.
Everything seemed to click in to place. The world saved by their ragtag band of misfits - a feat even they didn't expect to pull off. It was only after the dust settled they had a moment of silent confusion, looking to one another and quietly asking 'What Next'.
Aerith didn't know what the future had in store for her, but it didn't bother her. She knew that whatever was thrown her way she could survive it. Her will was strong, and she knew her duty to the Planet was more important than ever. Though she was the last living Cetra, she wasn't alone.
A familiar presence approached her from behind, strong arms wrapping around her waist as a chin came to rest on her shoulder. The balcony they stood on looked over the ruins of Midgar, and it was a sad sight to see.
"It's gonna take a long time to fix this," Zack said as he looked over the damage with Aerith, resignation in his voice. Aerith turned to face him, his arms still around her waist, and she placed her hands on his shoulders, smiling up at him wistfully.
"It will. When it's done, though, it'll be better than before. We can make it work."
Zack grinned down at her, leaning his head down to capture her lips with his for a single, deep kiss. "You're right. And who better to help rebuild than the last of an ancient race and an ex-SOLDIER?"
Aerith smiled, leaning her body into his and laying her head on his shoulder. She never felt more at home than she did in his arms.
"I can't think of anyone better."