I started to read a story and forgot to bookmark it and now I can´t find it anywhere. Help please!

I think it was a kink meme.
It started that Dean was auctioned off as a slave and Cas bought him.
Cas was the auctioneer and it was quiet uncommen for the auctioneer to buy.

I think in the later chapters there is Sam as well but I don´t know...

Does someone knows this story? It had several chapters.

Thank you for your help.