How I Become A Voyeur

It was the last year of elementary school. At the time my life revolved around sports, video games, trading cards ... boys stuff basically. My house was within walking distance of my school so I always stayed after class ended to play with my friends until everyone got picked up and then head back home. I had a classmate who was your typical teacher's pet, great at studying, obedient, never caused trouble. I never paid her much attention as girl was "yucky" at the time to me. That particularly day I stayed back later than usual because I left my house key at home and had to wait for my mother to get home from work. With nothing to do after all my friends went home, I got bored and went around school looking for something to do. When I was outside my classroom, I heard noises inside so I got curious, wondering who still had not went home. My classroom was on second floor and I got lazy to walk back to the building entrance and up the stairs so I just climb the nearby tree. What I saw was my classmate inside his lap, facing him, they were hugging each other. Having no idea about sex and both of them fully clothed, I just thought that she really is such a teacher's pet, wanting hugs from the teacher at that age. But then he kissed her on the lips and it wasn't light pecking that adult usually did to children but long tongued kiss. At the same time her body starting to rise and fall which I knew later on that she was riding him. Despite not knowing anything about sex, the scene made me excited and aroused. I was hugging the tree trunk and when I got hard, it gave me my first sexual feeling. So I was there humping the tree trunk watching my classmate having sex with my teacher. I got my release before him so I quickly jump down the tree and hide, worried that they knew what I did even though now I am sure they would be in so much more trouble than me. From then on I start seeking opportunity to spy on people have sex. First it was only my teacher and classmate which, then my parents, my friend's parents during a sleepover once, my sister and her boyfriend and now my in-laws after I got married. As for my classmate and my teacher, they continued their relationship until she graduated. I heard later on he got caught though when I was in highschool.