Komura-kun, the reason you feel that mysterious sense of corruption is because Mie-san is pouring gasoline on the fire of your libido. My advice is to relax, sit back, and enjoy the burn. Or go pierce your ear and then confess to her. Always claim your waifu at the earliest opportunity.
This chapter is pretty weird. Why mention his hair ? and we now can't see it as just another hair color manga/anime thing. Now he dyed hair ? Do that mean the school allow it ? (except all the film, manga i seen mention it is not allow). And that just doesn't fit his character.
And see man piercing the same way i see cross-dressing. But hey, it is your body so it up to you to use it as you like