Throat Training for My Chastity Slave

I'm planning a small gathering and want my chastity slave to be the main attraction for my guests. He will serve as the naked servant, locked in his chastity device. I'll encourage my friends to treat him as an object, allowing them to touch and use him as they wish, especially focusing on his mouth. It's important to me that he is well-prepared and trained not to let me down. I secure him in an upright position using bondage, ensuring his mouth is at the perfect height and that he can't move—this is how he'll be kept during the party. I position my machine in front of him, aligning it with his mouth, and then turn it on to start the throat-fucking. He must maintain his position, take any cock that enters his throat, and accept any cum in his mouth or all over his body.