Well, okay, this is it for you two.
You and Maria, naked, arm in arm, feel your way toward the deep end of the stomach. As you go, the acids rise higher and higher...they are now eating at your waist and then soon you are having trouble walking. It turns out that there is no way out of the stomach. The other valve is shut, as it should be. ELlie's body is not going to let you escape undigested! And even if you were to make it down that way, you would still have the intestines to get through.
You and Maria try to get back to the top of the stomach, but the acids really have you now. The stomach walls churn, and you and Maria slip many times and cry out in agony as your whole bodies are being dissolved...
You never make it alive out of there. sorry. As you embrace for the final time on earth, Ellie digests you. Then, and only then, do your bodies get to travel into her intestines and turn into shit. too bad.