>>22150 (OP)
For preds, I've heard of people using giant gummy worms or string cheese; takes a bit of practice though.
I'm a pred, but I've personally never tried it. I guess I just don't feel like deepthroating something irl, only in fantasy.
There are also allegedly ways to simulate the prey struggling inside you, but I've haven't heard of any beyond swallowing live animals.
I'm in the minority of preds who thinks unwilling is a bit too morbid, so I've also never tried it irl.