At the raid of the canterlot, tempest captured all princess except twilight and, when Tempest told Storm King about it he was mad.  
SK: Have you seriously failed the mission? You might have gotten 3 other princesses but the 4th one is still needed. As a punishment, you have consume a lot of laxative, and take off all your armor and clothes, but fine you can find a toilet and sit on it before you can start your punishment.  
TS: As you wish my Lord.  
After the report, Tempest got a lot of laxative and started looking for a toilet.  
Few minutes passes, she finds the toilet, consumes all the laxatives she got, takes off her armor and clothes, and sits on the toilet naked.  
Right when she placed her butt on the toilet a loud growl erupted in her belly and it followed with a fart coming out of her butt and it quickly was followed by a wave of diarrhea leaving her butt.  
TS: AHH!  
She moaned a lot while sitting on the toilet as large tsunamis of diarrhea exits her butt.  
TS: each minute, i’m - AHH - sitting here naked - AHH - on the toilet - AHH - gives more time for that last princess - AHHH - to figure out how to - AHH - stop us and - AHH - take away my chance to get - AHH - back my horn back - AHH - and I won’t let her.  
She was pushing out even harder and even more diarrhea left her butt.  
The diarrhea was hurting her butthole, but she was still fighting by pushing even harder.  
Few minutes passes and she manages to push out everything she had in her belly. But then she noticed that there isn’t any toilet paper, she cursed at that, but she put her clothes and armor back on, flushed the toilet and went to capture the 4th princess. And some poop in her butt won’t stop her.