(Okay, so, yeah, the intro post is the same, but hopefully the classes will take off in different directions.)
Michael found himself, once again, as a Hogwarts professor. He had agreed to substitute, but here he was already subbing, and for Defense Against the Dark Arts. He was certain few people knew much of anything about him. He would merely appears to them as if he was only an old man, and, for the most part, he was content in letting them believe that.
Unless someone had been unduly paying attention, they would not have noticed that at nearly every skirmish that they'd had requiring the fire power of an accurate wand, Michael had been there. Every time Minister of Magic Robert Lupin had needed backup for himself, Michael was his back up.
Who he was and what he did was not important. Teaching young witches and wizards how to protect themselves was. He poured himself a mug of tea from the kettle that was over the fireplace in his office, decended the stairs to the classroom and perched on the edge of the desk, checking his watch. It would be interesting to see who showed up for class and what skills they brought with them