I'm looking for a yaoi manga that his lover (uke) calls him by using "san" or something li...

I'm looking for a yaoi manga that his lover (uke) calls him by using "san" or something like that (maybe a teacher) then there no need to be used those names between them and he (seme) asks his lover (uke) to call by his name, he thinks he would get a nickname or something like that but he calls out his first name btw they were in the middle of having sex too