Mistress Amirah was naked with this guy but she was never going to fuck him. He did not know that and he expected her to. But instead of fucking him, she chose to give him a handjob. She made it naughty and he loved it and he did her the favors she wanted but he did not get to fuck her like he had thought he would get to do.
Mistress Amirah knows how to get whatever she sets her mind on. She wanted a job and she knew that this guy wanted to fuck her in order to give it to her. So she teased him with her sexy body and seductive ways and had him turned on. As she talked dirty to him and made naughty facial expressions, her hands were on his dick and balls and she gave him a great handjob. He came and that is how she got the job without fucking him.
Niki and Amira might be making it seem like they just want to give their slave a handjob but things are never going to be that easy for a fool like him. That start off by stroking him just to put him at ease. Then it's time for them to start kicking him right in the balls. It doesn't matter how much he needs to cum now. His semen is only getting out if they kick it out of him.