Author's note - All the characters in the story are above 18.
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Mark tried to block the noises that his two stepdaughters were making. Their mother couldn't handle them as she was working in the sex club that Mark owned. She was very well trained to please the men with her huge slutty tits, which were fake as Mark paid for the surgery. The girls, however, don't respect him as he is not their 'real daddy'. They were 21 and 23, but both of them were out of control and needed strict authority. Mark sighed and went to their room to see what the brats were whining about. "Maria, Millie, enough of your shouting and whining. Why are you both being a brat again?" As expected, they made faces and told Mark off. He wasn't their real daddy, they said. Mark thought he had had enough of this bitchiness in his own house. He needed to put the girls in their place and use them for the better good. They will now work for their step daddy's approval. They will soon walk naked with fake tits and dripping cunt and beg their daddy to fuck them.
Mark had ordered two metal collars for Maria and Millie that he would put on them when they were sleeping at night. The collar was made primarily to hypnotize girls. It was customized for the two brats, encouraging the girls to give up control of their minds and body and let Mark control them. He would be the ultimate authority over his two stepdaughters, and they would be his cute little slave girls who would do anything Daddy told them to.
As expected, the girls were sleeping by 10:00 PM, and Mark went to their room to put the collars around their necks. They couldn't take it off, as only Mark had that authority. The collar would shock them if they tried to break it or fight and defy him. The shock would only increase their submissive urges. The more they defy and resist, the more intense the shock, and the hypnotic waves coming out of it would make the girls more and more submissive. Mark used the same collar on their mother, who is now a perfectly trained bimbo who no longer needs the collar. The girls would soon fight for his approval and do everything Mark told them to do.
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Maria and Millie woke up the following day feeling heavy-headed. The collar was releasing waves in the night too. They both woke up with the dirty thought of wishing their stepdaddy good morning by sucking his cock. They were both grossed out by their thoughts, but their cunts were wet.