The crack of the paddle makes her jump a bit instinctively, but Hikari manages to hold her ground otherwise.  The impact makes the muscles of her legs tighten, drawing her up onto her tip-toes and leaning more of her weight forward onto her bracing hands; her asscheeks shake once from the force vibrating through them, then snap taut in reflex and cease shuddering...  well, from the actual energy imparted by the blow, anyway.  The young woman trembles quite a bit all on her own, giving a sharp yelp of surprise, "Yiii!"<br/><br/>Her right heel shifts out a bit further, widening her stance a tiny bit to better brace herself, and her chest shakes with a heaving exhale of breath held since before the blow landed.  "...  sou ka, sensai!" Hikari replies in a sharp, obedient bark, then goes right back to biting her lip.  The blow stung, to be sure, but her time as a gymnast 'gifted' her with a considerable tolerance for pain, especially of the sort that comes from sudden blunt impacts; you can only hit an uneven bar or miss your jump off a balance beam so many times before you got used to bruises and the like.<br/><br/>...  still, something about the paddle stings in a way that's more than physical.  Her cheeks burn with humiliation, and not just because she's being reprimanded by a teacher.  Even with her naivete, somewhere in the back of her head she realizes this is...<em>abnormal</em>.