"Hmmmmmmm.........."

Ibuki was just... sort of playing with Ippo's hands. His fingers, specifically. Bending them (in the way they're supposed to bend), pulling lightly on them, and bringing each one close to her face to inspect them closely...

... somehow, she ends up (accidentally?) making Ippo flip her off when she inspects his middle fingers, but she doesn't seem to notice what she did.