Her first instinct is to pull away, to tell this kid to leave her alone - she doesn't need anyone else. She already got one Aeon to accept her all on her own, and that was the part she'd been most worried about. Having anyone else along for the ride is just asking to have her secrets exposed for all of Spira to see, and then she'll never get to Zanarkand. There are plenty of wannabe summoners, anyway. He can find someone else to tag along with, and she opens her mouth to tell him so.

But Sheena makes the mistake of looking up into his face, and his expression...

This is a terrible idea.

"...Alright, I guess," is what comes out of her mouth instead of a refusal. "Just as long as you can keep up."