"So here we are, alone together..."
Oh no. Rea is starting to flirt again. Normally, that would be great. You may not have gotten any as a result, but you have been hopeful, and it can be fun trying. But this desire to eat her alive is so powerful and new... You don't have the energy to be distracted. Desperately, you search for something that might please her while taking your mind off your belly. Say... how about...?
As suavely as you can manage, you pick up her hand and kiss her on the tips of her fingers. Rea seems startled, but her "Well, ain't you the swank one?" sounds pleased. And you are pleased too. Your blindly raging appetite is, if not fully appeased, at least under a little control. Rea still looks delicious, but the idea of just grabbing her and shoving her into your maw has at least faded.
But it is still there. You are not back to sanity yet. How to make it the rest of the way? Well, if a little taste helps, then how about a big one?... And you know... honesty might actually be the best policy here... Well, at least a little honesty...
"Rea, that little kiss made me feel a lot better, but I am still ailing bad. I will need your whole hand to be cured..."
Given that Rea likes playing nurse, it's a pitch that has to appeal to her, even if she thinks you are trying to snow her. Which you are, if not in the way she thinks. what you want to hide is the fact you are a terrible monster that wants to eat her alive. But Rea thinks she knows what you are up to, and extends her hand to your lips.
This time, you do not limit this to a kiss. Instead you swallow her entire hand. You are careful to swallow gently and smoothly. Now that you think about it, the idea she won't notice you are doing the impossible is quite optimistic, but it had seemed reasonable until too late. However, even as you realize this, you see Rea is accepting it. Maybe knowing it is impossible for you to get her entire hand in your mouth is making her assume you are fooling her some way. Or maybe she just thinks she has tiny hands and you have a big mouth... Instead, she asks "Feel better now?" You can't speak of course, at least not without taking this wonderful food out of your mouth, So you use gestures that manage to to indicate you are much better, but are not "cured" yet. "Well, this feels nice, and I do want to help you... Keep it up as long as you need to."
You do and both of you relax into a happy state of pleasure. You still have this perverted thought of swallowing all of Rea, but you can control it now even as you enjoy her fantastic taste. You can enjoy her for hours...
...Maybe... You feel a jerk from Rea and open your eyes to see what it is, and see you have swallowed her arm to the elbow, and Rea has noticed too. "This is way weird..." she mutters, "... But you do look better... Are you?..." once again you gesture how much better you feel, along with your need for more treatments. She ponders for a moment before "Surprisingly, it feels nice for me too, so continue." You of course do, and another inch of her arm vanishes into your mouth.
Everything seems even better now. Rea is enjoying "curing" you, and you are enjoying her fantastic taste. but eventually you reach her shoulder and can go no further. Reluctantly you start unswallowing her arm. "Did that cure you?" Rea asks.
"It did me great good." you answer once you can talk again, "but it wasn't a cure. For that, it looks like I will need a leg."