Story idea, recycling the concept of a pred forced to eat prey:
Imagine a pred is somehow being forced to eat a prey they love, and both the aggressor and their prey don't know that the pred can do reformation. The whole time leading up to the act they're desperately trying to comfort them and find a way to assure them that it's okay, but they can't find a safe way to hint at them being safe without tipping off the other person, so they try to be as gentle and loving as they can be as they're forced to press their trembling body past their lips. They're so scared, they can feel it, and nothing they do can fix that, they can't find a way to tell them this isn't the end, not forever.
Swallowing is agony, but no more than the feeling of them struggling more and more the deeper they sink. They never wanted their first time to be like this, they never wanted to hurt them so badly. They're kept there, forced to sit there and feel their body break them down as they sob and cry, making sounds only their pred can hear. And after it all, once they know it's safe and they're finally somewhere they can bring the prey back, neither of them are the same again. They'll never get to have a safe first time, so maybe it never even happens again. The pred won't stop looking for ways to make their prey feel safe and loved again. The prey will never forget what it felt like to be destroyed and recreated.