News of Malfoy's generosity gets back to Snape.

Harry shuffles uncomfortably as Snape glares at him.

"Do I need to tell you how foolish it is to become indebted to a Malfoy?"

He knows better than to argue that it was just sweets.

"Should you need money in the future, I expect you to ask me, not make a pathetic figure of yourself to your friends."

He feels his face reddening, but only nods.

"I should take away your Hogsmeade privileges for the rest of the year."

He certainly never expects to walk out of Snape's office ten galleons richer.