I meet my new Mistress for the first time

‘Good, you are learning’. Sandra then proceed to tie a complicated diamond pattern with the rope around my upper body before finally feeding the rope back between my legs from the rear.
‘This is that part I really enjoy’ she breathed in my ear. Taking one of the rope ends, she wrapped it three times around my left testicle. She repeated this with the other end around my right testicle. The pain was exquisite and looking down I could see that balls now looked two swollen, fleshy plums. Sandra then took the rope ends from around my balls and forced then through the upper rubber ring around my cock, wrapped them around the rope around my waist before finally tying them off around the back of my neck. Sandra stood back to admire her handiwork, ‘That’s much better’ she said approvingly. I could see that from her point of view it was, my erect cock was now completely immobilised and secured to my body, unable to move. My balls looked very swollen and vulnerable. Sandra whispered into my ear ‘I think it is time for you to be milked’. She grasped hold of my bound cock with her left hand and with her right hand she pulled down on my already very stretched balls. ‘I am now your new Mistress and I am going to train you to be a complete and utter slut who obeys my every command’ she said as she slowly moved her hand up and down my shaft. ‘I want you to cum for me now and then clean the mess up afterwards with your tongue’. No longer able to contain myself, I spurted a small fountain of cum out of the end of cock and all over Mistress Sandra’s legs and shoes. ‘You silly bitch, look at the mess you made. Now clean it up.’ she commanded. I started licking and cleaning my sticky cum off her body. I thought to myself that if all my tasks were as pleasurable as this then I was certainly going to enjoy serving Mistress Sandra…