That's a very hot fantasy, and well written too! To take things further, perhaps your master can have you blindfolded in a classroom, with your hands cuffed behind your back to a chair. Shortly afterwards, you can hear people coming into the room, but you can't tell who they are. Then there are hands all over your body, feeling you up, first through your clothes and then under them. They fondle you until you've come a few times, and then they just leave you there with your clothes pushed up and your pussy dripping, until your master comes to uncuff you. After that, every time you walk into a classroom, you wonder if the people there ate among those who have toyed with you ...