During a summer vacation

Sex

During a summer vacation when I was 15 years old and going into my sophomore year in High School. I would hide and masturbate pretty often. This particular day I thought I was well hid behind a storage shed in the alley behind my home. Well, I'd forgotten that a neighbour girl worked for my dad and rode to and from work with him. I was doing mu thing and this day she walked through the alley for home instead of the street. There I stood with my pants down to my knees and about to the point of ejaculation when she walks by. She looked straight at me but turned away hurriedly as if she didn't see me. I way afraid she would tell my dad but I suppose she never did. But...she did tell her younger sister and her friend, both which were in my class at school. Well, when school started back her sisters girlfriend keep teasing me about the show I put on for, I'll call her Betti. If this wasn't embarrassing enough, she asked me between classes one day if I was gonna put on a show for her. I happened that we both sat in adjoining seats, side by side, in the rear of the room. Each time I'd glance in her direction she would make movements with her lips as if saying, "now" She'd slide her dress (Yes, girls did wear dresses then) up enough to show enough leg to cause me to get an erection. I unzipped my pants and took my member out so she could see it. I could easily tell she was getting excited. I started to masturbate with her watching as about the time I started to ejaculate our teacher started slowly moving to the back of the room as she was talking. I hurriedly started putting it back in my pants but ejaculated all over the floor. I did manage to get it back and my pants zipped before the teacher got to my desk. She stood by me with her hand on my shoulder. When she completed her subject, probably 30 seconds, she leaned over and whispered in my ear, "Clean it up." She never reflected afterwards that she knew but I know she did. Embarrassing? What do you think?