Challenge: Dumbledore's Army
Word Count: 100
Fortunately no one but Severus saw the impromptu Defense class. Even better, no one but Severus had the occlumency skills to pick Potter's brains about “Dumbledore's Army,” nor its membership. Umbridge had her suspicions, but Severus merely concentrated on his grading and sipped tea during her visits while she blathered.
Best of all, the children were actually learning during their sessions with Potter. Severus had stayed long enough to see them learn a variety of useful offensive and defensive spells. “They'll pass their OWLS, and possibly save their lives,” he told Minerva on the sly, and she nodded in agreement.