Ultimate Hentai Lottery of Denial
When you come to, you are in very a extravagantly furnished, small room. You are not tied, but the only door is closed, so you are stuck in here for now.
Soon enough the huge TV on the wall next to the only door comes to life and an... interestingly dressed woman addresses you through it.
"Welcome to the Institution! I assume you have heard of us already? We have quite a reputation..."
You nod, the Institution indeed has a reputation. Not necessarily the best, but a reputation nonetheless. However, this doesn't leave you any less confused on what you are doing here...
"I can see you are a bit confused. Yes, normally we only train women sent in here by their masters. We are normally not in the business of just kidnapping men (or women for that matter) at random. However, we have figured that broadening the range of our offered services might be in order, so maybe it is time to start offering training for submissive men as well. Our board is... divided on this issue, so we decided to test if our facilities can be used to train men into obedient sex slaves for their masters. And to avoid any partiality coming from asking any of our regular costumers to help with the acquisition of a test subject, we figured it would be the best to bring in sufficiently submissive man, who has no prior affiliation with us. That would be you, in case you haven't figured that one out yet."
Well, you didn't expect such a long winded explanation, that's for sure, but you decide to shut up for now and keep paying attention.
"Now, we won't actually enslave you. We will make you go through our program along with the girls we are training at the moment, then if we find your training to be sufficient we will let you go. You will be free to walk away. Of course, you might feel that freedom to be cumbersome by then, in which case we can provide you with a list of mistresses or masters (according to your preference) who would be willing to accept a new male slave... for the right price. But that's in the future. For now all that matters is the present. Your past is irrelevant, all you have to remember is that you will obey our commands. If you refuse there will be consequences..."
She goes on about the rules of the Institution for quite a while...