She's pretty sure her Princess of Heart powers are only going to work on Heartless. Being filled with Darkness would probably benefit him right now. A lot more than fluff.

"...S-Sora, stop. You're too cute." Yeah, his bleating is adorable and she can't help but pat a hand over him.

"I guess I could... try to reverse it? But what if I somehow make it worse!" She really needs your help here, Sora! "One bleat if you want me to try? Two for no?"

Or, y'know, maybe it'll just wear off on its own.

But it's not like either of them know that.