Hitotsu Futatsu Himitsu
Okay so the first story involves a teacher and a student and inverted nipples. Second Story involves a delinquent that just transferred overseas and then he saved like a little guy and then the third story involves a chief of a business thing and then he falls in love with his subordinate and kind of bullys him around a little but that's his way of showing his love and then they hook up that's it
Ai wo Kudasai
This was a really fluffy sensei x student mang.
Evergreen Days
Student falls in love with his teacher 14 years his senior.
Hatsujou