i need help looking for a yaoi manga

so the was this guy whose nipples were sucked in so this other guy who goes to school with him was helping him "train" his nipples to be outward like normal nipples and he would suck his nipples all the time also the guy who was sucking the nipples fell for the other guy and ended up sucking them too much and they gt swollen and had to get medicine for them I started rreading this when it first came out before I made an account for this and I don't know if it's good or not but I would like to finish it so if anyone knows please help a fellow fujoshi ┗( T﹏T )┛