Besides the occasional flirting, the only willing sexual sexual available for Eva while you're giant is the mutual masturbation scene when you reach max approval with her. It wouldn't make much sense for how I've written her character for her to want to be eaten. That said, the rest of the game will feature a tiny protagonist, and there will be options for you yourself to be a vorephile and willingly let yourself be eaten. Also, you may meet some tiny npcs later who are vorephiles as well...
As for the code in the secret room, if you manually type that cheat code into the command bar while playing, all hidden verbs on each object will be revealed