All the walking in my heels made the bottoms of my feet sore. While sitting on the bench I take my heels off to rub my feet. As I am rubbing my feet I look around and see there are five doors that appear to be private rooms where guests could take a slave to try them out. Once my feet stop hurting I put my heels back on and walk over too the rooms but doesn't appear the rooms are in use. Seeing there isn't any where to go I make my way back down the stairs to continue to look for Diddo. When I get back down to the first level I take a look outside to make sure Diddo didn't go that way. I started walking down the long hallway again looking for Diddo. On my way there I stop by the room where the guy was hooked to the milking machine was but there wasnt any one there but I did see the tv screen was still on and could see that it looked like the guy that was on the chair getting a blow job. I walk into the room to get a closer look. As I get closer I see that it is Diddo giving the guy the blow job. Stuned to see this on the screen I sit in the chair and watch as Diddo gives the blow job like she really knows what she is doing. I do kinda of get excited and place my hand on my cock. I start rubeing myself but what I realize is that as turned on as I am my cock never gets hard. I watch as the guy takes his cock out of diddo's mouth and can see his big cock shine in the light. He has Diddo lay on her back and put his cock between her big tits fucking them as he pinches her nipples. I guess it may have been a while for her to get this kind of attention it seemed like she was enjoying being forced to take it from the guy. A few moments later as I am sitting in the chair Mistress Nora comes and startles me not hearing her come in. She asks what i am doing. I studder and say watching my sister serve this guy. She looks at me and says with an evil smile. "while you are in here you can continue some training" Nora motions for a servant to hook me up to the milking machine while I watch my sister get fucked. Before she has the machine turned on she has the shock collar put back on my cock. She sees the scared look on my face laughs as she walks out the door.