Mistress and Master asked me to attend their house to be considered by them. They were both tops and were looking for someone they could both play with, alone and together. I arrived on time and was told to strip, wash thoroughly, and then crawl into the lounge where they were both waiting. I got a glimpse of them both before being told to keep my eyes down. Mistress was imperious, dressed in a leather short skirt and tight basque, high patent black heels and stockings; her face was beautifully made up and her pulled behind her head. Master wore a black leather waist coat and trousers with black boots. I was told to sit before Mistress and speak when told to. Master sat to one side. Mistress questioned me on my willingness not just to serve her orally with my tongue both front and back, but to suck Master too and accept him anally. She explained that they would both pee on me and inside my mouth; the Master might even try to pee in my bottom. I answered all her questions satisfactorily and Mistress got up and walked towards me. Her legs were divine and her shoes clacked on the wooden floor in that delightful way only stilettos do. She placed a leather collar around my neck. It said "slave" on it. She then told me that as long as I was in their house and wore the collar, I was to submit to both of them at all times and always do as I was told. She leant my head back and said she needed to seal my commitment. She told me to open my mouth and then spat into it, telling me to swallow and accept her authority to do anything. I did so. My submission was then required. I spent the afternoon worshipping Mistress shoes, legs and of course her pussy and bottom. My tongue explored as deep as I could go. I gave her several long orgasms and as she came, she dug her heels into my back and her nails into my shoulders. She then led me over to the Master who had been watching and forced my head onto his cock. He was already hard and played with himself while Mistress moved my head back and forth so that my mouth slid up and down his thick shaft. It didn't take long before he came in a mighty gush in my mouth. I was told to swallow it all and lick his cock clean. Mistress then took me back to sit in front of her while she drank from a near-by wine glass. When she had finished, she asked me if I was thirsty and when I said that I was, she put the glass between her thighs and filled it with her pee. The sound of the glass filling was so erotic and knowing what was coming created both an incredibly horny and subby feeling inside me. She came over to me, told me to tip my hear back and open my mouth. She then poured the glass into my mouth ordering to gulp it all down quickly. I did as I was told...