Princess Celestia's Living Toilet (Scat)

When you awaken, you are tied up. You're laying on your back, with a funnel in your mouth. Your neck is completely restrained. So you can't turn it in the slightest. You see Celestia enter your limited field of vision.

"I promised you a day without shit eating, but my body still has other things to relieve myself of."

She looks down at you, with a serious expression.

"If you let it overflow, I'll make you my sisters toilet for a week in addition."

She turns around with a giggle, hovering her dirty cunt over the funnel. You close your eyes.

She let's loose, and a stream of the most rancid, foul urine imaginable spills out of her. The yellow liquid has only one way to go, and it flows down your throat with no sign of stopping.

She sighs in relief as her ambrosia fills your mouth. She sprays you like a hose, her piss washing down the stains her dirty panties left in your mouth. The taste of her foul liquid is so strong and rancid it's almost impossible to swallow, and you feel like choking with every gulp you take. It's salty, and it makes the very back of your mouth burn like it was acid. But her powerful ray of piss keeps forcing you to drink. The stench of urine starts to fill the room. She keeps pissing. Eventually, the stream comes to a halt. Three small individual gushes of urine spill out as the final thing to leave her cunt before there is nothing but a slow dripping. Drip, drop.

She sighs again, then she walks away. You aren't thirsty anymore...