I need help looking for this story it's the first Supernatural one I've ever read. If any of you can help that would be wonderful!

Where Dean's car is turned into a woman by a witch, there staying at a motel and the girl knocks on their door naked.

It turns out that she's exactly how Dean drew of what his dream girl would look like when he was younger and near the end Sam leaves to get some clothes or something.

When their alone she thanks Dean for not having sex with anyone inside or on the hood or boot when she was a car. Than they end up having sex and Sam says something like "I can't believe I'm having sex or about to sleep with my car man this is weird"

And that's how that chapter ends please tell me the name of this fic as I really did like it and want to find it thanks.