Biology class

I arrived at my final class of the day. I went into the classroom, and immediately went into shock. There was a girl I knew all to well, naked and on top of my usual desk.

"Stella!?"

What is she doing here?

"Oh, it's you... You're in this class, huh?"

She went on to explain that the teacher brought her in to better showcase the human body. She's naked anyway, might as well make her useful I guess...

"It seems everyone in this class is a stickler. I've been here with my bare ass on display for 10 minutes, but no one's come to use me. I don't suppose you've changed your mind?"

"Maybe later..."

"You better!"

The teacher came in shortly afterwards. For the rest of the lesson, Stella was standing next to the teacher, who touched on various spots numerous, numerous times while teaching. When the bell rung, she gave her a hard slap in the ass before letting her leave.