Valerie brightens when she hears that she might get to bring him new toys, well, new slaves. And wriggles a little bit with arousal.
And then she twists her face with annoyance at that feeling he gets. What a horrible, awful feeling for someone like him to have! People like him should be above the petty mortals below him, to have the freedom to act howsoever they desire, treat everyone below them with impunity and whim, but to be chained by such a stupid mental hiccup... well, Valerie doesn't think her Master, her owner should be held back by such things. Especially not if they're getting in the way of his pleasure. She wonders if there's some way she can get rid of it, so he has no reason to restrict his (or her!) actions.
And then there's that scrap of a vision of him ruling, being strong and powerful enough to do whatever he wishes, with utter impunity, without having to lie or trick anyone, just going everywhere and taking it. And this, this vision really turns her on, making her press her legs together in excitement. She imagines a castle, full of dozens, hundreds, thousands of obedient slaves, all enslaved to him, kneeling, serving whatever pleasures he has, whatever whims come to mind, and no one else being able to change that. Strong enough to go out in the world and find a pretty girl (or boy?) and tell them "you're mine now, I'm going to do whatever I want to you and there's nothing you can do to stop it." And there wouldn't be. She presses her legs together a little harder and moans gently at the thought of someone with that much power.
(And maybe, just maybe, in his castle of tens of thousands of beautiful slaves waiting on his every beck and call, surely he could spare a few dozen, or hundred to be her slaves too. Answering to her and obedient to her in everything except their Master's word. The idea of being pleasured by a dozen men (or women?) was electric, as was the delightful thought of being interrupted by him, telling them to stop because he wanted to her to please him, an exercise of power that showed just how much she belonged to him... well. It would be a while. She could dream, and try to persuade him.)
She pouts when he tells her that he doesn't want her to lie like that. She doesn't know how to ensnare like that, the whole point of seduction, of control was to drive them along chasing the promise of something delightful, something incredible and amazing, to make them fall head over heels for something that she always kept... just... out of reach. If she had to be honest well, she might actually have to give it to them. And then what reason would they have to keep doing what she wanted?
And then his eyes glow again as he exercises his power, his will, and the room brightens, and she grins at him, feeling the rush of control that he has. She'd much rather have this power for herself, of course. But watching it in action, seeing it used... it makes her so hot. She can settle for being his loyal slave if she gets to watch him do this over and over again. Not that she has any choice (which is both slightly sad, and hot).