Going off that Leon submission, slightly, it reminded me of one of my biggest fantasies, but since I'm not a writer, I've never been able to get it written out. Basically, I love the idea of th RE2 (remake) game in its entirety, but with the twist of Leon somehow getting infected with a different virus (That was potentially secretly injected into him by umbrella as a 'test') that turns him into a gluttonous pred. So, instead of shooting all the zombies and monsters coming after him, he ends up just swallowing them all. Still pretty much following the same storyline as the game, though! I like the idea of Leon being confused/concerned about this strange new hunger/ability, but perhaps thinking that the only way to save the city is to get rid of all of the monsters! So he justifies eating everything because, since they're already turned, there's no saving them! I don't see him eating any non-infected prey, unless they really want it!
Think you could build off this, maybe? It's cool if not! I think it'd make for a great mass vore idea!
I imagine it was an accident or act of instinct the first time he ate a zombie. His belly holding fast and grumbling around his squirmy meal. Bullets don't seem to do anything, and after being attacked Leon finds he has a new regenative ability as well. So he forgoes his kevlar and shirt all together, tossing his weapons aside, and after a witty remark about dinner being served, he digs in.
If a person shows any little sign that they might be infected, he eats them. Grabbing them with his new strength and sending them down into his rapidly growing belly. He finds some survivors along the way who are rightfully frightened of him. So he simply tells them that behind him is probably safe, and lets them run past.
By the end of the night, his belly is massive. Causing buildings to buckle and the thunderous groaning draws in more infected. So he simply has to sit and wait for them to come to him. He even allowed some braver survivors to climb atop his huge belly for safety.
When all is said and done he has to be air lifted out of the city. Where he is dropped of at a remote location for study and so he can digest in piece.