Submissive female training - femdom strapon

She felt Mistress work the head up and down her slit, coating it in her juices but carefully avoiding her clit. She squirmed and tried to bring it into contact with the huge head but Mistress was far too clever for that and kept it just out of reach.
"Please mummy, please," little sub begged.
"Patience my little slut," the domina said. Alex felt the head pressing against her then, her slick lips parted but it stopped against her entrance. Dana held it with one hand to keep it on target and grasped Alex's hip with her other, she then leaned into it.
"Ooooooowwwwwwwwwwww," Alex groaned as the huge head forced it's way in.

Alex screamed at the shock of it. Pain shot through her, but that pain quickly mingled with pleasure as Mistress established a rhythm. In, out, in, out, full, empty, suddenly full again.
Her insides spasmed as the muscles deep inside of her ravaged pussy tried to squeeze the thick strapon and hold it in her. Alex bit her lip and then her whole body stiffened and with a final cry she came. Her orgasm washed over her, wave after wave of thick pleasure, heightened by the undercurrents of pain from her back and pussy.