Lady Shay had caught this guy trying to steal from her and she was not ok with it. She had to make sure that he learned his lesson and that he changed his behavior. That is why the mistress opted to choke the poor guy and to force him to suck another man's dick. Not only did he suck it, but he was supposed to swallow his cum as well.
Lady Shay felt that this guy stood in her way to landing a lucrative deal. She felt like she had to send a message to him that she would not let anything stand in her way. She, therefore, lured him to her torture chambers and she made him suck a dildo. She machine fucked him, made him wear a bra and she had him wear lingerie. He promised not to be an impediment to her.