Profit from a character design - any advice?

[invertedroum.livejournal.com]

Hey guys, first and foremost, I hope that I'm posting this in the right way; I haven't used AB much so please let me know if I need to change anything!

That said... I was looking for some advice on a problem, and some friends suggested that I try asking around here. I don't want to list any names yet, as I'd like to contact the individual in question first, but I'm not sure how to go about doing it.

So the issue is this: someone who purchased one of my adoptables in the past is now auctioning off a "date" with this character. It seems whoever wins the auction, gets to be featured in a picture with this character, and gets to choose the artist and details for the commission. Now, I would be okay if it was just the person who won the auction paying for the commission, but instead it looks as though the owner of this adoptable is attempting to make a profit off of this, which I have to be honest... I am not okay with.

Any suggestions on how I can handle this? I want to be civil, but I also want to be clear that I am not alright with people making money off of my designs. I kind of thought that it would be common sense/courtesy not to do so, but apparently I was wrong. So in the future I will be adding a T.O.S. to my adoptables, but for now I'm just trying to figure out how to handle this situation in the best way possible.

EDIT: Thank you to everyone for the advice and input, honestly I did not expect to get this many responses, and at this point I am just overwhelmed and I guess come to the conclusion that there is nothing that I can do. At this time I have decided to just be done with adoptables.