My boyfriend had been wearing the Kink3d Cobra cage I got him for a while. I had been making him wear it to work and send me chastity check selfies during the day. One day I noticed something hilarious when he sent his daily chastity check photo. His tiny cock didn't fill out the cage like it used to. His cock had shrunk! I decided it was time to give subby a chastity cage downsize! I obviously didn't tell him in advance that I was going to put him in a smaller cage. I started teasing his cute pink panties I make him wear, and then his cute pink cage. He was getting hard in his cage, but he wasn't filling it out like he used to. I teased him more as I reminded him that I have complete control over him and his useless cock. I took off my chastity key necklace and dangled it just above his cage. I unlocked him but told him not to get too excited. His cock was only free for a few seconds before I put the smaller cage on him. I was expecting it might be difficult to fit it in, but it fit in super easily which made it even more embarrassing for subby. I told him how small and pathetic he was and made him thank me for the downsize. Now that he was in a smaller cage, it was time to make him even more of a sissy. I put on my strapon harness and dildo, made subby get on all fours on the bed, and pegged him. He was such a good butt slut for me! I fucked his ass from behind and told him what a good sissy he was. Then I flipped him over so I could see his tiny little cage bounce around as I railed his ass with my big cock. It was so cute! I teased his cage with my fingers while I fucked him. I took out my vibrator and told him to put it on his little clitty like a girl. After a little while I told him he had 1 minute to cum and then I was going to stop fucking him, and poor subby couldn't even cum! I made him thank me for downsizing his cage and then fucking him like a girl.