... Neither Shelly nor Margaret said a word. They waited for their Master's next command like the good little slaves they had become.
The wait was not a long one.
"How about you, Mommy Dearest?" he sneered. "Think you can eat pussy as well as her?"
"Yes, Master," Margaret replied in a subdued tone. She was too terrified of the consequences to object.
He ordered Shelly to straddle her mother's face, sending a quick jolt through Margaret when Shelly didn't move fast enough to suit him. As Shelly knelt with a knee on either side of her mother's head, she looked down into her grief-stricken eyes. Then, closing her own eyes, she lowered her pussy down to her mother's waiting lips. Her mother's tongue expertly licked up and down her slit, teasing the lips apart and thrusting deep inside her daughter.
Shelly gasped as she felt her mother's tongue enter her. The sensation was unlike anything she'd ever felt before. Margaret used her nose to tease her daughter's tiny clit out of hiding and sucked it into her mouth. She briskly rubbed her tongue back and forth on the sensitive little nub and felt Shelly shudder violently in response. Shifting her position slightly, Margaret again slipped her tongue into Shelly's pussy.
Shelly, at the captor's urging, began rocking gently back and forth across her mother's face. Each stroke caused her clit to rub against her mother's nose. The friction quickly drove her over the edge. Crying out in shame and pleasure, Shelly came, her juices flowing into her mother's waiting mouth. Margaret eagerly lapped up the cum, swallowing all she could coax into her mouth.
Shelly slid off of her mother and coiled herself into as tight a ball as possible. She struggled to come to terms with all that had befallen her since waking in this tiny cinderblock room such a short time ago. Their captor left her little time to recover, however.
"Margaret, turn over on your stomach. Let's see that perfect ass of yours stuck up in the air."
With the stocks still holding her knees apart, turning over was not as easy a task as it sounded. Margaret finally struggled her way into position and waited for the inevitable. She heard her Master rummaging around in the cardboard box again and closed her eyes.
The Master tossed a large strap-on dildo onto the floor next to Shelly, who looked at it curiously. At the Master's command, she picked the device up and strapped it around her waist without a word of complaint. Somewhere in her mind, a voice screamed for her to stop, to fight back. But that voice was drowned out by her fear of the shock collar and of rousing the Master's anger again.
The strap-on had a large round bulge on Shelly's end that pressed against her clit. As she knelt into position behind her mother, she could feel it rubbing her and knew that would only get more intense once the fucking began.
"Stick it in her pussy, Shelly. Don't make me wait."
At her Master's words, she aimed the mushroom head of her fake cock at her mother's pussy and pushed forward with her hips. The head parted and then stretched Margaret's lips wide. She moaned as it worked its way deep inside her. Margaret found herself thinking of the third man in the group that had gang-raped her all those years ago. He had been huge; easily a foot long and almost half that thick. His buddies had made him wait until they had used her first, but even that had not prepared her for the onslaught of that mammoth cock, which she took first in her pussy, then her mouth, and finally her asshole.
She felt her daughter's tiny hands holding her hips and stroking the rubber cock in and out of her. She wondered how long their Master would force her daughter to fuck her. With a fake cock, there was no clear-cut finish line as there was with a real one. As Shelly began to establish a rhythm and pick up the pace, coherent thought fled in the face of the rising passion she was feeling in her cunt.
Each time Shelly bottomed out against her mother's cervix, the knob on her end of the dildo would grind against her own clit. Against her conscious will, she found herself fucking her mother faster and harder. She could hear her mother moaning as the fake cock filled her hole, but couldn't tell if it was derived from pleasure or pain. As her own orgasm neared, Shelly began to moan herself, thrusting her hips harder and faster into her mother.
Finally, her mother spoke.