[To Ibuki, that's a huge compliment. So, yes. It's also got her tails thumping against his with some sort of cheer or excitement.
And she can't help bonking her head against his hand with that hair ruffle, her expression stretching out into a big smile.]

BZZZZT - wrong!

Ibuki's not just "one of" your biggest fans! She is the biggest of Rohan-chan's fans!
After all... Rohan-chan is one of Ibuki's best friends!

[That's said without an ounce of hesitation, even followed with a little, fox-like laugh.
Almost like he's instantly drawn all that cheer she's been trying to stifle right out of her. Huh.]