I'm curious for scenarios which might be either willing or unwilling for the pred, but involves unwilling prey primarily. An example of this being unwilling for the pred could be: The prey's struggling causes the predator's stomach to throw them back up, but the prey doesn't make it past the mouth, and after a bit of struggling the prey gets sent back in. While an example of this being done willingly by the pred is: After the pred eats their prey and keeps them in for a few minutes / hours, (s)he forces them back up so the prey can climb past the throat but not outside the mouth... as a means of taunting them, and letting them have a few final views of the outside world through the predator's open muzzle. Cases where willing prey wants to push up and look outside for a bit with the predator's permission, are of course welcome too.
I'm mostly thinking of same-size or half-size vore here... but of course, a pred can also cough up micro prey, keep them in the mouth a bit, then swallow them back down. On a more picky note (optional) I'm most interested in cases where, after the prey is visible through the predator's mouth, they are seen covered in stomach juices or showing signs of digestion. And of course, the prey using this opportunity to beg for being let out or struggling to escape, obviously in vain. In regard to how far the prey gets, anything from the prey's head being barely visible at the back of the pred's throat, to the prey managing to pull part of itself out of the predator's mouth (but not its entire body).
A wonderful example is the comic "Payment in the Full" by GenerationSlayer. The full comic can be found here, with these being the pages in cause: