You stand still for a few seconds, not acknowledging what is happening until your sister runs into you. You don't know what she is doing, and all you do is yell "Hey, get off!" but your words are cut off when Annie stuffs your head into her mouth. She licks you in the face a few times before she leans back, shifting your weight so you can easily slide down into her.

By the time you realize what Annie is doing, your head is already halfway down her throat, and the rest of your body soon follows. You slide into your sister's stomach with a loud gulp, and your legs soon come in after you.

Outside, Annie licks her lips several times and gives a girlish burp, causing her stomach to shift around slightly. Annie pats her distended belly, and says to you "You tasted pretty good, Luke. But we'll see if you're really indigestible!" Annie's stomach shifts around and gurgles loudly, as it starts to churn around and rub against you.

"Annie, let me out of here! Now!" you call out from her churning belly, but you can tell she isn't listening. The fleshy walls of her stomach continue to rub and squeeze against you, groaning loudly as they did so. Suddenly, Annie begins speaking again. "I'll let you out sooner or later, bro. But first we have to test your so-called 'indigestible' abilities. If you're really immune, then you'll pass out of me later just fine. But if not, then you'll get to break down and be nutrients for me."

You sigh and sit back in your sisters hot stomach, rumbling and squeezing against you. Hot enzymes begin to secrete from the walls, filling up Annie's stomach as they did so. The stomach walls started to rub the acid into your skin, as...