She goes along with it

"I'm not sure," Sally said doubtfully. "What if we get caught?"

"We won't. Hardly anyone is here yet. He probably won't be here until tomorrow. One of my friends was helping out in Ms. Naylor's office and found out where all the men teachers will be located. It's easy. We won't be more than fifteen minutes. Come on Sally! It'll be so much fun!"

Sally bit her lip anxiously, but her eyes glittered with excitement. She looked at her older sister for a long moment, then giggled and nodded. Grace gave her a hug and the two of them changed into halter tops and shorts before shoving the spray cans into a backpack and scampering out the door and out of the building.

The campus grounds seemed all but deserted. A pair of gardeners working on a flower bed on the far side of the lawn were the only people in sight as they made their way to the cottage. Grace led the way onto the porch and eased the door open, listening for any signs of occupancy. Hearing nothing she slipped inside, suppressing a giggle and hurriedly gesturing her little sister to follow.

"The bedrooms are upstairs," she said, gesturing to the stairs.

"How do we know which one is his?"

"We'll just pick one. Either way he'll see it," Grace chuckled as she climbed the stairs, gesturing to her little sister to follow. There were three doors on the landing, the middle one open onto a bathroom. Grace went to the left and opened the door onto a bedroom, giggling as she looked around.

"We'll do it on the wall right over the bed," she said, dumping the spray cans out of her backpack and handing one to Sally before jumping onto the bed. After moment's hesitation her little sister joined her, the two of them spraying graffiti on the wall.

They had just finished writing "Drunk" and "Old Man" and Grace was putting the finishing touches on a crude cartoon of someone drinking a beer, when the door banged open. The sisters squealed in alarm as they spun to see a tall, lean grey haired man standing in the doorway, his face furious.