I have a specific fic that despite all my efforts I cannot find. I remember it started with the boys in a safe house, it was a well known hunters safe house and they are useing it to safely try out a new BDSM addition to their relationship. Dean is expirenced and Sam is not. Dean keeps Sam in restraints pretty much the entire time and if I'm remembering correctly he bought him a posture collar cause he thinks it will make Sam feel safer. It was a longer story because it covered a weeks worth of time in detail. Any help with this would be greatly appreciated.