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and well maybe kyouya doesnt spend more time than nana half naked, they're on the same level, BUT for kyouya its so much more EXTRA and IT IS sexualized BECAUSE HE'S RIPPED FOR NO FKN REASON AND YOU CAN SEE FURUYA-SENSEI LEARNING TO DRAW HIM MORE MUSCULAR (the anime did him well)
nana appears partially naked a several times but its never sexualized. the only time her boobs were emphasized was an assault scene and its here to make it more uncomfortable (as its supposed to be)
not to show off her sexiness
most of the time its not treated as anything special