You know the trope. You probably know the song! No need to explain here. Now, you can play out your student/teacher desires!
"Student/teacher" is used very loosely here. You could play out someone getting with their tutor, a player wanting their coach, or even a person who's been lusting after somebody who taught them how to macramé.
Usually, a certain amount of ageplay is implied with student/teacher, but it's not necessary! Anyone can teach another person of the same age, after all.
Comment with your character and preferences. Be sure to be specific with said preferences by including exactly what side you want to play or some possible scenarios. How serious or dark or fluffy or sexy the threads are depend on you.