Teacher’s Fantasy Lust pt 2 - Blackmailed

In part one of this fantasy you left me laying on my back on my desk. The leotard was pulled down to expose my breasts, and I had pulled the crotch aside so I could finger myself vigorously, pretending that my crushes were watching me and joining in!
As the erotic images flashed around my mind of me being seduced and ravished by beautiful young women from my past, I had the most colossal and most vocal orgasm I had ever experienced! My juices covered my fingers and flowed onto my thighs and tricked onto my desk.
I would have lingered in the afterglow a little longer had I not heard the familiar noise of a key turning in an old lock. I quickly sat up and slid off the old oak desk, whilst trying to push and pull my body back inside the skimpy black leotard. My head was in a spin, I looked over towards the door, wondering how it could be opened as I had left my key in it?
In a second or so I then realised that it the door of the opposite side of the room, which I did not have a key too, but clearly someone else did. My brain quickly came up with a lie that I was doing some Zumba exercises! Hopefully whoever was pushing open the large stiff old door would believe me. I half expected to see Alison Coombes the caretaker, she was a bit of laugh and would see the funny side of my silly situation!
I quickly reached for my work dress and held it against me, so as to hide the obscenely clingy leotard. I then innocently looked up towards the door, as in stepped two of the year 11 girls, lead by the snotty head prefect, Jasmine from year 12. She was joined by her very close and inseparable friends India and Ellie.
Straight away I launched into my lie, saying that they had caught me doing some exercises! I then quickly tried to deflect any questions by asking Jasmin, just what she and her friends were doing? Clearly they should not be in this building or having the key to the locked door.
Jasmine just did a knowing arrogant snide smile, and placed her hands on her hips. She then strolled around the room, enjoying my squirming and flushing as she informed me that they had viewed and heard my whole ‘routine’ from the other side of the door!
To my surprise behind the door was a narrow service corridor, which they discovered some time ago, and all the keys were in the locks. Apparently Miss Coombes the Caretaker knew all about their little hideaway, but turned a blind eye due to a secret that she would not want to get out!
Jasmine clearly was an expert at manipulation and it would seem blackmail. This was further proven my what she had recorded through the door window. Just enough of the opaque window film had corroded away to give a perfect spy hole. If I did not cooperate, much in the same way Miss Coombes did, then my career would be at an end.