I forgot where it was.. this was YEARS ago like in my higschool days... anyways, it was about this young school teacher who wore an outfit that would tickle her. I guess this boy was "narrating" a story and he mentioned he would fantasize his teacher getting naked and wearing this outfit which would tickle her like crazy. Well in the story, one of the students, a young female girl was being a trouble maker and the teacher had the girl get naked and she put this tickling outfit on but wore protection underneath so it wouldn't tickle her, and the teacher had her and the female student tied to I believe a teatherpole and the girl had her clothes removed while the class watch with glee as the trouble maker student laughs her head off and then the young boy narrator removes a part of safety clothing from the tied teacher that was guarding her from the tickling but since he removed it, it began tickling the teacher and then the movement from the girl being tickled affected the teacher tickling her and vice versa.
That was the first story I remember reading.