So I've come to a conclusion that for the past three years, one year before the pandemic starts. soon after, my girlfriend and I had become even closer now that we both work from home. This lead us to explore our darkest deepest secret when it comes to our fetish. In this case, we start of by me getting aroused when she plays with my testicles. From a simple massage, to squeezing. The more we explore, the more she found out I had a thing for BDSM. In particular, getting dominated by her. This turns really quickly around when the pandemic starts. We start buying things such as whips, strap-on, chastity cage, hand cuffs and many more. She started off locking me in the chastity cage of her choice. By any means, I have a pretty decent size. 7.5 inch long and quite thick. Throughout the days, she would keep me in cage to keep myself horny. Eventually she will release me. HOWEVER, thing become really dark after she found out I got hard when she jokingly said she would smash and rupture my testicles. We tried of this castration thing, and turns out, my gf too gets into the idea of castration play as she was getting wet when we watch castration video on an animal farm and even on a person. Now, through the weekdays, she would put me in a cage, and would release me on the weekends. The way she would release me, is by castration play. She threatened me that she would cut both of my testicles or that she would jerk me or let me fuck her, while stating that this will be my last ejaculation before she castrate me. When she said this kind of stuff during our sex, I became very aroused and our sex become even more intimate and hotter. And her too becomes wetter and had more intense orgasm. Now, as a result, I can never be satisfied with the normal way anymore. For some reason, I had to had castration play at some point to get myself off. When we were having sex outside, like the public toilet in the park or cars, she would band my testicles so that it would seem like a scenario where I am having my last sex in public while my balls slowly dies due to the banding. Borderline is, she knew the idea of castration play gets both of us off, and we love it. Have we talked about if we were going to do it for real? Yes we talked about it. But not to the point where we decide we would take both of my testicles off. HOWEVER. We never know what lies in the future.