Replying...
Intro. During an exam you raise your hand to ask a question. When she arrives at your test she presses her crotch to the corner of the desk and begins rubbing against it, as she answers your question she's panting heavily, it's obvious she was pleasuring herself. Once she answers your question she rubs against the desk for another moment before leaving. Once she's gone you notice she's left a clear residue on your desk. You decide to approach her after the exam.

Elara Meadowlight

@john