I loved this manga sooo much! I have introverted nipples myself and that's why u read it to begin with! and I'm really happy I read this manga I live it. You could tell the author took there time with the story line but it did feel a little rushed in the end chapters but it was overall an amazing yaoiWolf manga!!
Ore no Kanbotsu Chikubi ga Senpai no Shitapi de Tachimashita