A few minutes after arriving in the workout room a rather large and muscular man in his 30's arrives. His name is Johnny. Johnny in stern voice tells me to remove all my clothes except my heels. Once naked he starts out by having me do some serious stretches. For starters he had me stand up with my legs spread wide and then bend over grabbing the toes of one leg. Probably about an hour later or so Diddo shoes up looking nice and not quite as groggy as when I saw her last. She immediately dropped to her knees and proceed to give Johnny a blow job while I continue stretching. When Diddo was finished blowing Johnny he had me come over to them and turn around and spread my legs. A moment later I felt Diddo's tongue licking my ass going in and out. At first I was embarrassed but as Diddo was working her tongue in and out was really turning me on then she reached around and started to stroke my cock. My cock was a little sore from the night before but everything she was doing was feeling great and I was just about to blow my load. Johnny decided to make this a game and now if I cum before three minutes are up I get to run on the evil treadmill. If I don't then I get to take advantage of Diddo in any way I see fit. I started to cry and moan at the same time. Knowing that Diddo arm was still injured and she was really stretched the night before and not wanting her to get into more trouble. With tears on our faces. I blew my load which felt incredible into the cup that Diddo brought with her. Johnny laughed at our sight. Rose I am glad you lost will love working that ass of yours. When Diddo left to head back to the mansion. Watching you two turned me on before I put you on the treadmill I am going to fuck that ass of yours. He bends me over and shoves his big cock into my ass and starts pounding me as hard and fast as he can. After he shoots his load into my ass he forces me to clean him off. Johnny has me climb up on the treadmill and hooks my arms to the bar. He then attaches the device and turns on the switch as I start to walk about every 30 seconds there is a series of spankings from the two paddles on the device. Half way through the mile run he decides to turn the machine on higher forcing me to run faster. When I finally got done with my run my ass cheeks were beat red and legs felt almost like jello. He then tells me that is all for now and to put my clothes back on and go back to the mansion to get a snack and some water and come back for the rest of your workout. I put my clothes on and begin to stumble my way back to the mansion thinking what did Mistress want with the sample of my cum.