Do anyone know this yaoi manga?

So i don’t really remember this manga so good. The one thing I remember is that there is a new transfer student and meet his teacher. This teacher is kinda good looking (if I remembers this right) and the student is getting interested. But his classmates said that there is a game. So people is trying to get laid or trying to make this handsome teacher to fall in love with one of them. So the new student accepts this challenge and is trying his hardest but this teacher is kinda hard. At the end, the student starts to fall in love with the teacher but the teacher have no feelings what so ever. The student have given up and stops coming to the teacher’s room. When he stops coming, the teacher starts to realize he have feelings for the student or something like that. I don’t really remember. But in the end the they get together and are happy... i think...

So if anyone knows the name of this manga with my bad bad English summary. English isn’t my first language so I may have some wrong grammar here and there.