having to pee in unconventional places, like a bush or a corner
Alternatively, having to pee in some sort sort of container or bottle or whatever
BONUS POINTS if the container isn't big enough to hold it all, and they wind up either managing to stop the flow, or they piss uncontrollably on the floor
When the character š«š¶š“šµ š£š¢š³š¦ššŗ makes it to a toilet in time
Character deciding to let out š«š¶š“šµ š¢ ššŖšµšµšš¦ bit to ease the preasure (even better of they're unable to stop once they've started)
When they have to go so bad they're almost panting
Character being tortured by the sound of someone else relieving themselves
That trope where the character is running around trying to find a toilet, but everything seems to be going wrong
When the character is so close to being able to go, but something or someone gets in the eay, prolonging their desperation even further
When the character knows they'll be able to go in x amount of minutes, and the closer they get the longer the minutes feel
Rocking hips back and forth while sitting
Legs shaking from holding so hard
Feel free to add on to the list :)