There are many theories circulating among the Equestrian population on how Princess Celestia seemingly can go for days without using the bathroom.
Some believe that thousands of years of lengthy royal meetings have given her bladder size and control beyond that of mere mortal ponies.
Some choose to believe that alicorns, being essentially demigods, have simply ascended past such earthly needs.
Others have come up with altogether more strange theories on the subject, that are too numerous to mention and in any case irrelevant to the story.
The one thing all of these theories have in common, is that they are all completely and utterly wrong.
 
As one of the Princess' few chosen ones - her closest and most personal bodyguards, you are among the few select who know the truth.
It is common knowledge that the Princess is always accompanied by a small entourage of her most elite bodyguards whenever she makes public appearances.
The public belief is that this is to keep undesirable elements at a distance and protect her from potential attackers.
This is of course true, but what the public does not suspect is that they also serve another purpose - as the Princess' personal urinary assistants.
 
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Today, the princess has been dealing with a seemingly neverending line of audiences, and you are currently on duty, positioned directly behind her so as to be able to pick up her signals when your services are required.
It feels like you've been standing here for hours (which, come to think of it, you probably have), and you're almost about to start dozing off when the signal comes.
A slight movement of her tail to the side and a wink of her clit at you, a tiny trickle of moisture escaping her urethra as she does so.
You immediately spring to full attention, and a faint glow emanates from your horn as your magic begins to pull out a retractable transparent tube from your urethra.
The sensation of the slippery tube gliding against the insides of your urethra causes your previously retracted horsecock to start growing.
 
Once enough of the tube has been pulled out, you gently prod the opening of the princess' vulva with the tube before proceeding to expertly slide it into the opening of her urethra.
As soon as the tube is firmly in place, you see it turning a deep amber color as the sun goddess' fluids fill it, and feel the warmth of her golden nectar flowing up your urethra and into your bladder.
It's a wonderous sensation, and you immediately feel your member growing harder.
Soon, you begin to feel the urge to urinate as your bladder fills up with the princess' urine, but the flow shows no sign of stopping.
You begin to regret having those extra drinks of water earlier, but you will just have to deal with it.
 
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As your bladder rapidly approaches its limit, another sensation begins to overpower the urge to urinate - a great arousal building up inside you.
The flow is slowing due to the increased resistance of your overfilled bladder, but still continues to push its way inside you extending your bladder further.
This amount is unusual even for the princess, and you are becoming seriously worried.
You feel the pressure in your bladder stimulating your prostate, and realize that you're coming close to an orgasm.
Unless the flow stops soon, you don't know if you'll be able to hold it back any longer.
 
Finally, you are unable to hold back any longer. It takes all your willpower to keep your legs from giving out under you as an earthshattering orgasm shoots through your body.
The tube turns murky with seemen as you shoot load after load against the flow and into the princess' bladder.
As your orgasm subsides, you notice that the flow has stopped. The inside of the tube is now covered in tiny semen particles.
The princess shows no sign of reaction, but you know she must have noticed something.
You quickly remove the tube from her urethra and slide it back inside you and indicate to one of the bodyguards at her sides to take your place, before hurrying off to the bathroom nervous about what will happen later when you have to confront the princess away from the public.
 
THE END