I don't think there is much just an unconscious girl you can mess with, which unlocks/lock sleep creep, after you have done that it tells you, that you have completed all the content, I don't think it was intened to be more than s simple immersion object. the game within a game.The in-game walkthrough says there is one, and that you have to click the icon to get it. However as I said in my first post, clicking on it does nothing. Normally I'd probably just play it and not worry about it, but while messing around I did find out there is at least one Kink thing that can be activated during that, so it seems (can't confirm as I haven't progressed) that content can be unlocked or locked during this. Hence why I now want to know how to see the walkthrough that is mentioned.
It's pretty linear, though there is some stuff under the bench that I couldn't fins a use for, probably a red herring.