Hand raised roosters as pets are fun. But, often the spoiled boy does not know how to act when with other chickens. Aart is on the right track. However, you may never be able to change his attitude to the hens. I like trying to separate them again, for a few months, where they are in adjoining runs and trying again, later. It may be, he and the girls need growing up a bit. He may be too rough for your older hen as well and never change his bad attitude towards girls. Introducing different ages, mixing different flocks of the same age and new roosters anytime, is tricky and sometimes does not work well! I had a pet rooster as a very young boy, named Henry. I loved him and he was a good pet. He never was any good at being a rooster for the girls, he never mated, just occasionally attacked a hen till submission(never injured a hen) and he was raised with them! We made him his own coop(my mother loved him too), but free ranged them all, fairly OK. I think he bonded to people and was a natural eunuch. Good luck with your pet rooster! Btw, Henry liked to stand on my father's giant snapping turtles back. One day, his first year, he was drowned and my mother did artificial respiration and warmed the bird in the gas oven with the pilot light on! Henry lived for 12 years and died in his coop one night.