Wait before following

You're still a bit stunned at the offer. You're getting a lot of dirty looks from the girls in the room but some of the guys look like they might well take your place if you don't move sometime soon. Mr. Wattlee hasn't even batted an eyelid and looks far too absorbed in his book. You know that he heard every word though, he always has.

One of the girls, Amy? You can't remember is trying to start a conversation, but your mind isn't on her at all. After about a minute of not paying attention you excuse yourself "I'm off to the toiled Mr. Wattlee." "What? Oh yes, sure." He is back in his book already and misses the knowing nods around the class.

Leaving the classroom you walk up the stairs you come to the lab. The door is slightly ajar, and you can hear a moaning sound coming from behind it. You enter, closing the door behind you, the moaning is much louder now and you don’t need two guesses to work out who’s making it.

Rounding the corner the first thing you see is Petra's jeans on the floor, then her panties hanging off a stool and finally Petra, her legs splayed wide on a bench, sliding a glass test tube in and out of a very moist looking snatch. "What took you so long? I thought I'd have to get myself off", she snaps, not slowing her hand at all.

Her neatly trimmed pussy seems to just suck the test tube right into her. She's sitting on her shirt; her perky little tits rocking back and forth in time with her bodys motion as she presses the tube deep once more. Each little tittie is topped by a hard, dark brown nipple that is just begging to be nibbled on. She reaches up and rolls one of those tight little buds between her thumb and finger. "The thing to be careful about with these is not to cum with it still inside you, broke one doing that once, makes for a very delicate trip to hospital and some embarrassing explanations... You gonna get undressed or what?"

You finally look up from her beautiful tan body into her hungry eyes and know that its time you got a move on or she is likely to finish without you.