Custom video: 
you bought a new slave girl to please you. she comes and you are excited. she is very pretty. you command her to undress so you can inspect her. she gets naked and you see she is not a woman but actually a feminized castrated eunuch (no balls)
 you touch between her legs. she has a tiny penis and empty sac. she is definitely a eunuch.
you get naked to check reaction of her penis and get sure that she is not interested at all, but she is very obedient and submissive.
Now time to think how could you use her in other ways: maybe she can serve you in other ways like washing your hair and painting your nails and shaving your pussy...
she is very pretty and her  high pitch feminine voice is normal for a eunuch. you tell her it is a good thing she does not have testicles so she has no sperm so she will never get a woman pregnant. 
she will learn everything quickly because she doesn't get distracted by girls, it is better this way and she will be very focused for you.
you think maybe she will be a loyal slave for you. she is a good eunuch.