Pull out and endure the frustration

I decided that i had had enough of Ms Wilkins' consequences today.I pulled my fingers out and at Ms Wilkins' instruction, i returned to my seat adjacent to Sarah. I sat there wiggling for a while, desperately wanting to finish, but afraid of what the teacher might have in store. when i finally started calming down, i felt a few fingers near my crotch again. Sarah was going to make me cum again, and i was powerless to resist. As i bit my lip, ready for the teacher to discover my antics once more, Sarah pulled away, leaving me frustrated, but too scared to finish the job. As i sat, catching my breath and wriggling, i suddenly felt my hands pulled back and tied up with...my satchel! i had left it with Sarah! Well at least i couldn't touch myself now. My pussy was starting to calm down, and i sighed with relief. Sarah hears this, and once again starts to work me up.This goes on for a while, until i am **** to cum. I NEEDED to cum. "Please, please, PLEASE let me finish!" I plead into Sarah's ear. She smirks and refuses. She then signals to Amy to grab my left hand and Allyson grabbed my right. She unbound my wrists and replaced my satchel, but with my hands in Ally's and Amy's, i couldn't relieve myself. The bell rang and we were let out to lunch soon after.

On the way, with Ally and Amy holding my hands, i had no way to relieve myself. Even worse, Sarah was walking behind me, still teasing me. My front was protected from view by the satchel so no-one could see what she was doing, but the slick trail running down my legs and tracing my steps was clearly visible. My friends brought me to the toilet block and frustrated me all lunch. By the time we had to head down to Gym class, I was visibly panting and my pussy was swollen. as we walked over, Sarah pressed her finger on my clit. I was so close that any friction on my clit would have caused me to cum. But no. her finger was just there, unmoving, teasing me, frustrating me beyond any limits i knew i had.

In Gym class all the students were tightly packed, and so no-one saw my friends securing me. I pleaded to Sarah to let me cum, despite what the gym teacher would do as a punishment. Instead of a firm no, i saw her waver.