She starts to toy with you

After thinking for a few seconds, she smiles. "Well, I appreciate you giving me such a detailed explanation," she starts. "You did a really REALLY good job with that answer."

As she praises your work, the heat builds in your body drastically, much more than earlier. You rock your hips backwards and moan, feeling the dampness return to between your legs. Your friend watches intently. "Wow, you weren't kidding," she says. Her smile deepens. "Pop quiz! How wet are you right now?"

You try to keep from answering, but the building sensation takes over. "Extremely wet," you say. "Dripping. My panties are soaked..." You blush as you realize what you're saying, but can't stop yourself. You see Sophia get a glint in her eye.

"I think we've covered the exam material well enough for today..." she says slowly. "But maybe there are a few other things we can grade you on..."