She opens up.

"WHAT THE FUCK DUDE" you hear her yell in her bassier voice. You just drop to your knees in front of her, getting a handful of dick before using your other hand to pull a leg over your shoulder. "I'm not ready for this yet." The pitch rising and the volume lowering in her voice. You begin to rub your thumb in circles on the underside of her cockhead.

Next, you bring your free hand down and tug gently on the gemstone in her ass. Not budging at first, the plug eventually does come out, forcefully enough for your mind to insert a popping noise that isn't really there. You can see why as the wide base comes out first, followed by a tip that tapers gradually to a rounded point.

In front of your eyes now is a cavern that looks like it could fit a roll of quarters inside without touching the walls.