Specific Sam/Dean Swan(lake?) story

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Hi guys, hope you can help me out here :)

I don´t really remember a lot of the story but here is what I remember: Sam gets turned into a Swan(because of a curse I think) and he goes missing, Dean searchs for him following a Swan to a lake, the swan turns out to be Sam who turns into a swan in the day light and return to his human form in mid night (or something like that) Also Sam is attached to the lake or something so Dean comes and visits him everyday. I remember the monster who cursed Sam wanted to take his virginity and then kill him or something like that...

And that´s all. Im not really sure if this was a slashfanfic or a girl!sam story, also Im not quite sure but I think Sam was underage during the story. It´s really confusing..Oh and the story is pretty recent(2012) and Im pretty sure it was part of a bang or something.

Ring any bells?