Keep a low profile in the teacher's lounge

You decide that you can keep a nice, low profile if you go pick up a teacher with a free hour at the teacher's lounge. You head over to the teacher's lounge, and peeking in the window on the door, see that it is populated by several teachers of each gender. You also see that one of your favorite teachers, Mrs. Knox, is in the lounge. You have her for the last class of the day, and have spent many hours daydreaming about either getting out of school, or having sex with Mrs. Knox, during her class.

With a bit of focus, you cause the teacher next to her, Mr. Fridley, to "accidentally" spill his coffee all over Mrs. Knox's shirt and skirt. You duck back into the teacher's woman's bathroom behind, and wait for Mrs. Knox to come in to clean herself off.