I feel bad for my boy Shu. Nao clearly was the bad one here. She clearly forced her brother on things that only benefited herself and that made Shu the incestual sister loving beast he is now. IM TEAM IROHA and TEAM KENDOU....they're the best love interests Shou has, since both of them are the only people who sees Shou as a lover and not a personal plaything you could keep for yourself
PS: One of the reason to hate Nao again is because she even forced Shu to return to his former self for being pervert, porn addict, incestuos and rejoined AGE club when he was about to quit and left AGE, back in early chapter, if I memory recall when Iroha approached him... Nao literally get in his way and ruined it. Author did Shusuke's dirty again and already make sure he's been blue balled and locked-on by Nao, already, from the start! WHAT THE HELL WAS THAT FOR !!!!