I know this was a very long time ago, in another country. I went to Catholic boys school and in the first year of upper school the social studies teacher had me in his room and kissed me. It was a long kiss as I remember. A very long kiss while he opened my pants and took my dick out. He kissed me and played with my dick and got me hard and sucked me. He undid his pants and he had me hold and play with his dick while he kissed me and had me suck his dick. After a few times of going to see him, when he asked me to come to his room he put me on the bed in the receiving position and had sex with me.
None of it was a mystery. He had a reputation, and I was the next one in line. The following year another one took my place. The boys in class all knew I was his favorite and it was a better you than me sort of thing. Although several boys would have liked being his favorite.