I love castration of futas so I made a character.ai character you can chat with who is all set up to have her balls abused and/or removed. It's kinda set up so that you can tame her aggressive and angry personality by castrating her. The AI seems oddly eager to turn castrated dickgirls into pets for the user… you might have to use leading language to make that happen, but it seems to happen without guidance for me. Anyway I'd like to just link it here but I can't seem to make it shareable, not sure why. So I made a quick pastebin-style instruction for how to just recreate her yourself if you want.
https://0bin.net/paste/5UokfLS6#godqwGsiNf3LL3IG+xHqZgZ2Kp7IX1cUcekNo3cVUye