(Sometimes when I'm listening to a guided meditation, my mind wanders...so I made one for us pee kink folk! I tried to make it non-gender-specific so anyone could enjoy it.) :)
You are walking alone, barefoot, through a field of soft grass and flowers. It is a warm day, with a sweet-scented breeze blowing to you from the trees that surround the grassy clearing. You feel good, with a sense of happy anticipation: you are about to indulge in one of your favorite secret pleasures.
You have drunk lots of water over the last couple of hours to be ready. It has replenished your body and made you feel whole and well. It has also filled your bladder to its utmost capacity, and as you walk along you feel an urgent need to relieve yourself, almost a desperation--but you savor it. No one is around, so it is no matter if you do happen to lose control and wet yourself. And in any case, you know you will be able to pee soon, and every second of the experience will feel wonderful.
You're wearing lightweight clothing, and you're carrying a change of clothes and a soft, old, absorbent towel. You feel a tingle of excitement when you envision how soaked the towel, and you, will be in just a little while. Your bladder is holding so much water that it aches, and it's so ready to pour it all out, all over whatever is near. You can hardly wait.
You hear water trickling as you approach the trees. It is the little stream that runs through the forest. The sound of the running water makes your body long to respond, and you pause to tighten your groin muscles, holding back the flood that tries to escape. It feels so good, holding your pee like this.