When a character with a bursting, full-to-the-brim bladder can't hold it in any longer. They pee uncontrollably, their stream is strong, heavy, powerful, long. The release of pee feels very good and extremely relieving. The relief may be almost overwhelming. They pee for a long time and let out a large volume. The volume of pee does not need to be realistic. Relief may make characters moan or sigh after being extremely desperate. The holding muscles fail and the character cannot stop peeing until empty. Describe sensations like the hot stream, spreading wet warmth, emptying/deflating bladder, incredible relief.