Elizabeth was just about to grin and suggest that Megan should slide her pretty young body to her knees and get her head under her professor;s skirt for a "pop quiz" when she heard the knocking on the door. She groaned in frustration.
Quickly coming back to reality, Elizabeth began to slightly panic. Standing up, she straightened out her hair and skirt. Picking up Megan's dress from the ground and handed it to Megan. "Hurry." She whispered.
Merlin, if this was some first year asking for help, she was going to go insane. She was so randy! Casting a few quick charms to tidy her desk and cover the scent and feel of sex in the air - helpful charms she had learned in her schooldays - she made her way to the door.
Turning to see if Megan was properly dressed and looked as innocent as she could, Elizabeth opened the door. She was mildly shocked to see who it was. "Professor Snape. What a surprise." she commented professionally, not giving any hint of what had just happened away.
"What can I do for you?"Knowing she would not be able to simply brush the potions master off, she allowed him entrance. "I was just helping Miss Jones here with a difficult homework problem..."