You have biology with the 12th graders of form 3, great girls who are only a couple of years your junior, and you thought 2nd period was hard.

Luckily you have break first, time enough to get a cup of coffee to calm your nerves. you Leave the staff room a few minuets before the bell to get to your classroom and have a quick look at the register, there appear to be a few more boys than girls, but nowhere near as many more as there were on the lower grade registers you had seen
"I wonder where they all went" you joke to yourself, then suddenly the bell goes nd within a couple of minuets your class file in, there are 4 main tables in the classroom, the boys fill up two of them, and sit there quietly, not trying to draw attention to themselves, as that could be the last mistake they ever make, whilst the girls all fill up the front two, chatting and gossiping between themselves.
"Class please quieten down" you request, and immediately the class goes quiet and they all turn to face you, a few of the girls sizing you up.
Now then class, I am going to be teaching you your biology lesson today as your previous teacher is off with a bad bout of the flu" you pause looking around the class a few of the girls appear to have taken a great interest in you, a couple of them catch your eye, one has medium length ginger hair, average sized breasts and a rather cute face, the other has short black hair, large breasts and a much more cheeky look on her face.

"So what did you do last lesson class?" you ask, a few of the class raise their hands, all of them girls
"You, what is you name?" you ask looking at the ginger one
"Lindsay, sir" she replies
"So, what were you doing last lesson?"
"Well we were doing the digestive system" she replies
"Ok and where were you up to?" you ask, hoping that none of the girls in here were too intent on giving you some first hand experience on how their digestive system worked. The black haired one raises her hand
"And you are?"
"Jess sir" she replies. I hope this one doesn't want me as much as the other Jess did
you hope to yourself
"And where were you up to?"
"Making models of the digestive system, we started last lesson"
"Good well continue with that" and with that you sit down

You look around the usual teachers cluttered desk and spot the book they are using to model the digestive system, trying to figure out what all of the complicated diagrams mean when someone taps you on the shoulder, you nearly die of a heart attack from the shock. You turn around to see