Naughty teacher playing in school yard

I was really horny one day and wanted to do something crazy and risky so I came up with idea to masturbate in school yard, so I did it. I didn't have classes that day but I had to come to school to take some papers so after I did it I masturbated in school yard while students were having classes. I was so excited by the thought they could see me through the windows or someone could pass by and see what I was doing. I know it was really crazy but I couldn't resist it at that moment. I still don't know if anyone saw me. I am sure someone did cause I wasn't hiding at all and  the classroom windows were around me.