Sorry for my bad English The story is like the MC (uke) been feeling scared of his teacher/prof because he is being touchy. The SEME which is uke's classmate notice it and tried to help him because the teacher became so obsessed like he's waiting in the front of uke house or giving gifts.
Kuzu Seito to Stalker Sensei — involves a student and an obsessive teacher, but the roles and plot differ from what you described or Sensei, Kowai Hanashi Shimasenka? — has a school setting and a student who protects a teacher, so the roles are reversed
Sorry for my bad English
The story is like the MC (uke) been feeling scared of his teacher/prof because he is being touchy. The SEME which is uke's classmate notice it and tried to help him because the teacher became so obsessed like he's waiting in the front of uke house or giving gifts.