Gingerly, Mo lifted his hands off the parchment protecting his desk. The parchment itself, although dusty, was carefully rolled and tucked back into his satchel. Honestly, he hated to pull out his wand with all this dust on the desk and in the hair. He tried to keep his wand pristine and polished, and the dust... well, it just clung to the wand and made it look streaky and smeared.

He needed someone to cast that polishing spell on his wand.

Mo rolled up his sleeves as he stood, hoping to get a better angle on his desk. The first spell, the Scourgify, was one he was already very familiar with, what with being a fourth year and having a mother who believed in a clean house. He didn't bother practicing this familiar spell, and when Mo pointed his wand a the desk and spoke a clear, "Scourgify," it worked just as expected.

No more dust. Gone.

The next spell was new, though, and Mo did spend several long minutes drawing out the S in the air. Like a snake. Like a shiny shiny snake. Or like a string, perhaps. Or... an S. Whatever it was, he had it down. His arm dropped to his side, and Mo muttered the incantation to himself. "Po-lee-oh-tus. Poliotus."

Only once he really felt it was mastered did Mo attempt the spell on his desk. He drew the S with a loose wiggle of his wand and spoke the incantation, "Poliotus." The dust-free desk went from scuffed to shiny in a moment. Now see? THIS was a desk onto which he'd be willing to rest his hands.