I am in a sub/dom relationship with a woman who is 5 years older than I. I am now 21. I was primed for this I suppose because I was always submissive in a family of three step-sisters and a step mother. I had to start wearing diapers again when I was 13 and now that I am a sub, I continue to wear them when my dom wants it, like right now. when I was a kid I had a bed wetting problem and wet the bed at my cousins. I ended up wearing one of my girl cousin's nylon panties for the days when I was there and a diaper and plastic panties at night. After that I continued wearing diapers and plastic panties every night and often during the day as this was my step-mother's way to deal with my problem.My dom is very sweet. She does not humiliate me or anything like that. I am spanked with a strap or a belt when she believes I need it. I also wear panties all the time. From the beginning I have had to wear a collar and often am leashed either around the house or when we go out to certain places.Last week My dom told me she was going to introduce a new dimension to my training. It was called chastity training. The next day she took me to a sex store with extensive equipment for bondage, submission, discipline etc. She had the girl clerk show us chastity devices for men and picked one out for me, telling me I would be wearing it from the next day onward.The next day all day went by until evening. I had been leashed most of the day and she led me into her bedroom All I had on was a loose shirt top like a camisole and bikini panties. I had to take off the panties and then I had to put on the device. First was a cock ring that I put on like any other metal cock ring. I have often worn cock rings but my mistress prefers the leather type which I often wear with a cock ring-butt plug harness. After the cocking she put a liberal amount of lube on my cock and then slid it into the cage. She clicked the rods on the cage into the cock ring and locked it. For the next hour or so I walked around the house with just the cockcage on and nothing else, to get used to it. At one point I started to get hard but that was limited by the cage. We were going to one of her girl friends that evening so I was told I'd be diapered with plastic panties. She put the diaper on me and helped me pull up the tight plastic panties. I put exercise pants on over. When we got to her friends house she told her that I was wearing a cock cage for the first time. The friend wanted to see it so I had to take my pants off and then pull down the plastic panties and the diaper. Her friend fondled the metal cage and told us that she had decided to put her own sub into a cock cage and this convinced her. My dom told me I could stay without my pants on for the rest of the evening. She held the leash and I was allowed to sit on the floor. She and her girlfriend were discussing the different kinds of instruments to use for an effective spanking. My mistress asked me to tell her friend the difference between a whipping with a belt or a spanking with a switch or paddle. I told her when I was given a choice I always chose the leather strap or belt.For the past few days I have worn the cock cage all day with a diaper and plastic panties. At night she takes it off me but leaves the cock ring on before she diapers me. She told me that if I behave and submit to my spankings properly I will be allowed to cum once a week.I'm getting used to the cage. I have been allowed to try wearing full nylon panties with it but right now I wear a diaper every day.