Its impossible to please everyone, I personally came because I thought Nagatoro looked quite cute, and the premise of the story made me hope that she was teasing her future husband to help him grow stronger- or at least more confident lol.
The only person who spoke to him after so long, and she seems so mean at first, that's the classic "She just likes you" thing your parents would tell you, but he's also grown quite fond and used to her company despite her constant teasing. She's become angry of rudeness from her friends (who are just plain cunts lmao. The only other one who isn't a full on cunt was that newer girl that joined their friend group, but she likes to tease too.) towards him and has jealousy when they make weird flirtatious moves on him.
*Also Nanashi likes lolis... so... "Current Best Girl," president might not even be important after this arc.*
Lastly, the worst case scenario is president laughs in MC's face when her SECOND generic dirty art of herself ends up winning the nut of any hormonal boy who views it, and shuts the art club down- in which scenario all he would have to do is open a new one, or his own separate club.
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Actually scratch that, I think an even worse case scenario is he draws Nagatoro and her friends in a erotic way, ruining their reputation in the school (surprised president can do it a second time and still not be looked at in a weird way) and also ruining the purity that would be him and Nagatoro- because now other boys would either lust towards her or laugh at her lack of tits.