She took Alex's cock in her mouth in one go.
Anna had been hoping to suck his dick into its full length, but being the hot blooded young male that he was, he was already hard as fuck by the time she took him in her mouth. The tip of his dick slammed into the back of her throat. As Alex shoved his way into her mouth, she slobbered all over his cock, making sure he was sufficiently lubricated. She tightened her jaw, stiffening his large bulging cock in her mouth.
Then, with an expertise that only came with experience, she gripped the remainder of the dick that could not fit into her mouth, and she began to tug firmly while she sucked on the tip of his dick. Anna was in full control of Alex's body. She sucked him hungrily because she wanted him. She had longed for him for so long, and it reflected in the way she sucked on his dick voraciously.
Alex was mentally and physically her hostage.