Nomad is very developed with plenty of player as pred scenes.
Here's a list of text-based vore games, most of which are tagged with player/(M/F/?) if you can play as pred.
Flexible Survival allows you to play as pred once you do the Inner Predator event, which you can find once you reach level 5 (just enter "hunt inner" whenever you're outside and as long as you pass the check you'll get it).
Vrogue lets you play as pred once you get down to a certain floor. Beware it is a roguelike, if you want to play as pred without struggling to get there you'll want to run the debug.exe instead of the main .exe