The stomach acids being rubbed into your skin are definitely burning now. It seems like forever before the elf finally stops to take a drink, more water pouring in, you shoot your hand up and catch the sphincter just before it closes! The elf's body lurches as she trys to correct the problem. You widen the sphincter and push yourself up, before long your breasts and head are in her mouth once more while you push for leverage.
The elf seems rather annoyed at the idea of losing her lunch, so she uses her hands to try and push you back in, and giving harsh swallows with her throat. While your slowly making progress, the strain it has on you is intense. Thirty minutes go by and you've barely been able to even move an inch. But you have to keep trying, she can't win -- Right?