I saw that video for the first time for the other day and I really enjoyed it.
True, funny story: I used to be really pee-shy too. My dominant fellow took great pleasure in teasing and taunting me about it. I couldn't pee in crowded public washrooms, and anytime I felt like I was "pressured" to pee, it just didn't work.
...And then I became a Pro-Domme. It was my second or third night there and a young (and oddly handsome!) fellow came in for a watersports/humiliation session. I was asked if I wanted to participate, and I was somewhat honest when I said that I didn't know if I'd be able to, but that I'd be willing to try.
So, I walk into the main dungeon with another trainee, the dungeon owner, and the mistress who was conducting the session, and the boy in question is chained in a cage. He has gorgeous golden hair, bright blue eyes and a really fit body. I had found out about this session 30 minutes before it was about to take place, so by this point I had drank a shitload of water.
They moved him to a bondage table in the middle of the room. I let the others go first, still not knowing if I could. And then, finally, it was my turn. The other trainee put a "box" in front of me so I could step up onto it, and then onto the table. What I didn't realize, though, was that the box wasn't solid, so... I put one foot on it, went to shift my weight up and it totally collapsed beneath me. Rofl. I scraped my leg against the side of the table, and still have a scar on my right leg as a result.
...The best part? There were 4 other people in the room and no one else even noticed the fall, so I just got up again, lol.
I stood up on the table, standing above him, straddling his body. I did have a few minutes of honestly not being sure if I could do this or not, and stalled by ordering him to beg and plead. I told him that I'd only piss on him if I thought he earned it, and begging properly might appease me.
So, he begged, and by some miracle.. my body cooperated with me. I pissed on his cock, while listening to him plead for me to piss in his mouth. So, I did, and he spit it out all over himself. When he begged to lick me clean (something that I'm not offering in my services, in case you were wondering), I got to use the "Why would I let you lick me clean after you spit all of my piss out?!". He begged and begged, and I just stood there and humiliated him, telling him all the reasons why I wouldn't allow it.
...And since then I've probably done more watersports-related Pro-Domme scenes than anything else. Needless to say, I'm not pee-shy anymore.
TL;DR: Was pee shy, became a Pro-Domme, fell on my ass while attempting to piss on some dude's cock, and then managed to do it anyway.
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And on a totally unrelated note: AWESOME CHOCOLATEY GOODNESS!!! I'm so glad someone got screen caps of that!