Once all the subs were enrolled, they were lined up in a room, completely naked, with their hands cuffed behind their back. You and all the other subs were staring straight at a mirror - but you knew it was actually a 2-way mirror, like you see in any police interrogation room. So anyone on the other side was able to see you and the other potential slaves, but you couldn't see them. You knew the mistresses were behind that glass. You felt incredibly exposed and vulnerable, but your cock was rock hard in anticipation of what might happen tonight. But first you had to get selected.
Each potential slave was numbered, and when your number came up you were auctioned off to the mistresses. Whoever bid the highest for you got to take you and do whatever they wanted - as long as it wasn't on your Limits list. When your number finally came up, there was a short moment of silence - which felt like an eternity - then the auction master announced you were sold.
Instantly, you were grabbed from behind, blindfolded, and led to a room where you were tied to the wall. Bound, naked, and horribly anxious, you waited.