Originally Posted by Antarctica!

Risu strode in, carrying a stack of heavy-looking books. They were not, to be truthful, needed for this lesson, but he hadn't found any other place to put them in his office, so he'd decided to just store them somewhere in the classroom.

He was pleased to see a few people there already. Astronomy had never been the most popular class (and he chose to think of this because of how arduous it was to get to the Tower, and that it was more of a Muggle-centric subject than others), but as long as some of his students showed up, he'd be able to do his lesson.

"Hello... hello... good afternoon," he said in the direction of several of them, wandering through the row of student desks to the front, where he dropped the books on his own desk with a heavy thud. This raised a small cloud of dust. He turned around. He still looked much older than before his disappearance, but there was a genuine smile on his face. "Welcome, and welcome back, everyone. I think we'll wait another few minutes for any stragglers to arrive, and then we shall begin," he announced. He leaned against the desk. "Does anyone have anything interesting to share?"