Send her to class and return to yours

"You better get to class," you say, glancing at your watch. "You have 5 minutes."

Jessica kisses you and picks up her damp panties. She hands them to you. "Here's a little souvenir of our little tryst." Then she pulls up her skirt and button her dress shirt. The missing button is at the top, so her shirt is showing even more cleavage -- the very edge of her areola is barely showing. She unlocks the door and slips out.

You pull up and close your pants, tucking your shirt into the belt. You straighten your tie. Then you leave the bathroom. checking the hallway before stepping out. You head back to your room and prepare for your next class.