A chastity boy needs to be useful and if their cocks where of any use then they would be in a cage so it is important their holes are of use to dominant men. I explain this to my chastity boy and I intend to test his cock sucking and deep throat skills to see how much training he is going to need before I let him anywhere near my cock. I use a dildo and push it down his throat until he is gagging, choking and his eyes are streaming, his body is covered in his own saliva. I keep training that throat until I am satisfied the boy does well.