What if Sam took the leprechaun up on his deal?
"What's the deal? I'm sure it's not out of the kindness of your heart," Sam asked the leprechaun.
"Actually I want you to protect me from children."
"What?" Sam asked totally confused.
"They're trying to steal my Lucky Charms," the leprechaun said.
"Are you serious?"
"They're magically delicious."
"OK, then," Sam agreed wondering how his soul would feel about being a protector of cereal.
Sam felt his soul re-enter him. "Where's the cereal?"
The leprechaun showed him the box and Sam quickly ate it all while holding off the little man. "Guess the deal's off," he said and walked out of the room.
He had to find Dean. He had a lot to make up for.
The End
A/N: This is not what I had originally planned. I was going to have the leprechaun ask Sam to protect him from his enemies and have a whole story about that, but I googled to see if leprechauns had any mythical enemies, and there was this one site that said that children were their greatest enemies because they were always trying to steal their Lucky Charms and I just couldn't resist.