Also imagine mid-digestion sex where she's still basking in the feeling of being so satiated and you can see her body filling out from the mass being absorbed into her while her belly shrinks down and makes constant noise, or post-digestion sex where she's fully absorbed her prey and focused on showing off just how much she can overpower you and wring you dry thanks to her routine diet of live, whole prey, her exercise from hunting, and her fucked up physiology. You could probably measure her growth over time as a result of her eating so much, collecting and dating each set of lingerie that she grows or breaks out of as she expands.

Or to be REALLY freaky, post-digestion handholding when she's getting post-digestion and post-sex clarity and you're reassuring her you don't see her as some stupid gluttonous bimbo monster who'll go crazy and bloat herself with a whole neighborhood of people, and falling asleep with her like that to the sounds of her insides still gently gurgling away.

Now that I think about it, this is probably the same line of submissive fetishist thinking that gets so many women into stories like Twilight