Lucy bit her lip to fight back a moan at the tone in Katie's "threat". It in no was dissuaded her from her plan. She was about to say a comeback when Professor Slughorn came out.
"Of course, Professor." Lucy said with an innocent smile and a tone of a teacher's pet, a tone that all Ravenclaws had seem to have perfected that endeared teachers to them.
Grinning back at Katie, Lucy followed the girl in. As the lesson went on, Lucy continued her plan of sending Katie shag-me eyes, their intensity only doubled now. As she moved about working on her potion, She had pinned her hair up and rolled up her sleeves, chewing her lip as she concentrated. Between steps, she would send Katie more looks.