Ballbusting magic

I'd like a story to be written by anyone if at all possible, I like the the concept of portal/removal magic.
So maybe a future world where men can physically remove their nuts but not actually be castrated (or something like that), so they can put them in a safe place (like a safety deposit box, or wife's purse) yet still have full function and feeling but a female or group of females figure out a way to get ahold of said balls and have twisted fun.