"Accepted. Terms?"
"Only to disarm. No alteration of appearances or anything irreparable—"
"You're an old hand at this—"
"And—if I win, you leave me alone. No sideways glances, no chance meetings in corridors, nothing. I don't exist to you. Acceptable?"
"Yes. And if I win, you relinquish your position. You go to herbology and I return to Potions. Understood?"
"Yes," she replied quickly, then gulping as she fully realized the extent of the proposal.
They shook hands and stood back to back, putting their wands at the ready. Snape counted off ten paces and shouted—
"Relegare mantellum!" as she screamed "Expelliarmus!"
Agatha felt her robe being ripped from her back. His wand didn't even flicker in his hand but he cocked his head to one side and smirked, this time even more satisfied than before.
Furious, she aimed her wand again and shouted, "Asportare!" dragging Snape rapidly across the floor by his heels and knocking him into the wall, jarring his breath.
"Relegare bracae!" he mustered and once again, Agatha's pants went flying from her, joining her robe. He then began to cackle before breaking out into a hearty laugh. Noticing she was nearly naked, she dropped her wand and covered her chest. He raised his wand, still spread-eagled against the wall and said, "Match."
"Oh, you damnable man! You're not being fair!" she howled in frustration, stomping her foot. She had no clothing, a loathsome job, and a man mocking her misfortune.
"I obeyed the rules you laid out, madam..." he said, silkily as he stood and approached her. She scowled and turned so her back was to him. Under normal circumstances, she may have begun to cry, but she was at a loss for both words and tears.
He gently came up behind her, carrying her clothing in his hands.
"Here," he said shortly, passing them to her unceremoniously. She took them and held them to her chest.
"When will we tell Dumbledore?" she sniffed, trying to get back to the business at hand.
"There's no need for that..."he said, softly.