She's embarrassed

“Sorry,” you try to say as you notice how flushed she is, but she’s already ran out of the classroom.

“Gone to wash her face, I expect,” says Mrs Nelson as you make your way back to your seat, face flushed once more now that the adrenaline has drained out of you. By the time you’re in your seat, she’s already moved on.

“As I’m sure you’re aware, Jack here has a special condition which requires him to come every hour or so. Usually I would have been happy to see him squirm by himself, but it seems like today he needed some… extra attention. What Sarah did was very kind, I’m sure you’ll agree.”

You hear a short snigger from someone at the back. Turning around, you see that it comes from a leggy blonde girl right in the corner. She doesn’t bother to raise her hand before saying “I think she’s really slutty Mrs Nelson.”