Looking for a fic where a teenager (or possibly more than one) has been taken by the Fae, and Dean and Castiel go after them because there is a chance Cas can use being an angel to get the teenager back if they haven't eaten/drunk anything yet. But Dean and Cas have to pretend to be a couple while they are in the faerie kingdom, and there is a bit where they are given outfits with jewels and flower accessories - the first night the colours are just about Cas being an angel, but after that Dean gets outfits that match his colouring. By the end, the pretend relationship is obviously a real one, but I can't remember much else.

Any suggestions?