"Outside the wall?" she asks, zoning out wistfully. Looks like you might have touched on a soft spot. Or at least one of several since you started molesting her. Promising her an escape might be a way to buy her loyalty, though it's entirely up to you as whether you deliver on that promise. Still, while she's starting to calm down, she hasn't done so entirely. Her muscles are still tense, and her breathing is only starting to slow down. Still, you notice that as she relaxes, she starts to look less aroused. It might just be because her mind has started to wander, but you can't help but to wonder if she was getting off on the fear to some extent. That shouldn't be too difficult to remedy for now, as you notice the guard twitch. You know that while she's struggling, that guard isn't going to shrug off the effects of your poison any time soon. But the woman with her head buried between your legs doesn't need to know that.
You could always bring the twitching to her attention, and try to scare some lust back into her. It would make her more enthusiastic and horny, and you'd be able to some payback by laughing at her expense. However, lying like that might hurt her trust in you. Or you could try to comfort her further. The sex would become more sensual than passionate, but you might be able to build up some more loyalty and trust. All that said, you could just order her to get back to eating you out. Or really anything else that would please you. You're horny too after all.
Spoiler (click to show/hide):
Here we go, Paragon and Renegade options.