Her Prisoner (by Susan Strict)
"A good face-fuck," she said, delighted by his horrified and agonised expression. "Just what you need."
She turned up the second control. The rotating balls inside the vibrator felt as though they were pulling his mouth from side to side rapidly. She increased the speed and the vibration. He tried to tell her that it was really hurting him, but all she did was to plunge the device up and down harder and faster in his mouth.
"And finally..." she said as she pressed the third control and slid it forward.
The end of the vibrator tilted sideways and started to rotate inside his mouth. It was as though the whole thing had suddenly come alive and was looking for a way out, pressing into his cheeks, against the roof of his mouth and forcing his tongue down. She pushed, ramming the end of it deeply into the very back of his mouth and almost down his throat, coming close to choking him. She held it there.