Fleur could feel the cold air of the room hit her folds as Lavender pushed aside her panties. Biting her lip, she waited for Lavender's tongue, wondering how she could stop herself from moaning too loudly when she did but the tongue never came. Nothing did, for a while and she wondered why Lavender stopped.
Then she felt the breath caress her and she let out a breath, carefully disguised as a sigh at the horrible quality of the paper she was suppose to be grading. She should have known that Lavender was going to tease her more.
Just able to hear Lavender's question over the Ravenclaw boy's coughs, Fleur quickly thought of a way to reply to her lover. Furtively, she tore a small piece of parchment from a blank sheet and wrote a note. The under the pretense of getting another ink bottle from her drawer, she balled the paper up and tossed it under her desk, still not able to see Lavender, before returning to her privious state of concealed arousal.
On the scrap of parchment, in elegant cursive script; Thirty-eight minutes. Also, I hope you're well aware of the punishment you've earned for this, Mademoiselle Brown.