What was that? Is Komachi an M?

No, she was being all "Aww shucks" about her boobs, which got her some serving of pain.

it's certainly less painful than a kick between your legs

Frencheese said:
it's certainly less painful than a kick between your legs

You know from experience? Of... both? O_o

It is possible to determine the incapacitating effects, though not the pain directly, of an injury without experiencing it.

Though how painful a crotch-kick is isn't really relevant to Komachi gettin' boob-slapped.