You spin around to see Lindsay smiling happily at you
"Sir" she says
"Yes Lindsay how may I help?"
"Oh no, I don't need help, I was just coming to see if I could be of nay help, because judging by the puzzled look on your face you were struggling to understand the diagram in the book" she said, crouching down so she is at your level.
"Oh... yeah" you say embarrassed "I haven't done science since i was 16 so i'm kinda a bit rusty"
"well" she say "This is the trachea, this is where all the food goes when you swallow it, it passes down here, through the diaphragm, a large flap of skin that separates your guts from your chest cavity, into your stomach." she says grinning at you
"and then..." she adds, getting closer to you, so close you can smell her hair "well I can show what happens next"
She wraps one of her arms round you, and with the other unbuttons the bottom half of her shirt, rolling it up and tying it up behind her so you get a great view of her perfectly flat stomach. she starts to rub it
"Just imagine yourself in here, imagine the pleasure of becoming part of my beautiful sexy body" She says seductively as she sits up onto your lap, legs spread and both arms rapped around you so you cant move
"Come on" she says softly, giving you a little peck on the nose " you know you want to"