There was an old series out there "Wrong Place, Wrong Time" or something like that. It was about a guy who was castrated for a harem.

Fifth chapter: What happens to our hero and his wife, when they return to England?

IS this it?

http://www.iauthor.uk.com/a-harem-boy-s ... ries-:7583

I have my doubts but it might be.

To my knowledge it was only the 4 parts https://eunuchworld.co/s10472