Warrior Cats Online - Who stole it?!

The plot:
Mintpaw is doing her usual tour of the river shores, looking for shells and nice pebbles to collect for her nest, when suddenly... something shiny catches her eyes. It's underwater, almost hidden by sand and colorful stones, but she's sure she's never seen anything like that. A treasure! A golden, brilliant rock was buried in the river bed and Mintpaw decides immediately to come back to the apprentices' den with it.
She cares for it, keep it safe among reeds and flowers, watching her precious rock every time she comes here for a rest... or just some time alone. There is something special about the way it shines at her eyes. But someone else, an apprentice who noticed how much Mintpaw cherished such a weird -and unique- stone, is jealous.
This cat decides to wait for Mintpaw to follow her mentor out of camp, before sneaking in and stealing her treasure. Fishkit/paw ( @Darkclaws ) witnesses everything happening, but he doesn't care about anything until Mintpaw finds out and realizes it's nowhere to be found. Seeing her in tears, Fishkit/paw decides to tell her everything and Mintpaw freaks out (internally).
The end will be the confrontation between Mintpaw and the thief, who can then decide if asking for forgiveness or just give in and remain despicable as before.

What I'm looking for:
An apprentice, no age requirements, who might get envious at Mintpaw's precious treasure (which is actually pyrite, if you're wondering) and become a little thief.
If in the end your apprentice is not willing to give it up, Mintpaw will attack them and a warrior will have to split them up. (I'm looking at you... :kittyface: @Cherry~ )

EDIT: I'd already started the plot with someone else who had to drop it some time later, so I'd really really like to find another person willing to do it. We can start it all over again or continue from our previous thread, you choose!