Pred that eats a prey that's small enough to where it BARELY makes a bulge on her body. She looks just a tad bloated maybe, but otherwise, she looks normal. Only she knows about the squirming, writhing morsel deep within her body...
When she goes home that night, she's able to lay flat on her stomach. Her belly spills out just a tad, and finally, that's when the unfortunate morsel in her body is visible. Her sides bulge out a little as the prey within squirms and struggles for release, but now, it's much more challenging, since the prey is practically being crushed now.
It's all to make the pred feel better. She LOVES feeling the straining inside of her, the desperate pushing and scrambling for purchase...
Even better is if she occasionally teases and taunts the prey, who, while angry, can't deny how flustered it makes them that they're being teased about how easily they became someone else's meal.