Always eager to please her Master, she's been trained to follow his every command... But what happens when her Master wants to tie her down and watch her get fucked by another man?

WARNING! This 4,200 word story contains graphic descriptions of bdsm, domination, bondage, masturbation, voyeurism, exhibitionism, orgasm denial, cuckolding, and explosive orgasms that will leave you trembling and begging for more... It is intended for mature audiences only!

Here's a taste:
“Darling, are you enjoying yourself?” Her Master asked, raising an eyebrow. His tone was so casual, he might as well have been asking if she liked a song on the radio.
Shame washed over her. She closed her eyes and gave a small nod.
“Answer me. Are you enjoying yourself?” He asked sternly.
“Yes, Master.” She whispered, tears stinging her eyes at the admission. She didn’t want to enjoy it, but she couldn’t help it, couldn’t deny it. This stranger, who wasn't her Master, was giving her pleasure. She looked away, not wanting to look at him while she said the words aloud. “Yes, Master, I’m enjoying myself.”
“Would you like Michael to fuck you?” He asked, and she felt her breath catch in her throat.
She didn’t want anyone but her Master to fuck her. She didn’t want to want anyone but him. But the deep ache inside of her, and her clenching, hungry sex, told her that that didn’t matter. Not right now.
It was clear that her Master wasn’t going to make love to her right now, and she had never felt so desperate to be filled before. A tear slid down her cheek as she realized what her answer was.
“Yes, Master. I want him to fuck me...” She said, her voice thick with desire...