That weekend I was out with a group of friends, we'd already had a few drinks in a bar and were about to move on to a nightclub. I knew that my sister-in-law was also out with friends, so I called her to find out what she was doing. After a few dozen minutes, our two groups met in front of a bar and we decided to go clubbing together. So we walk to this place and my sister-in-law and I close the procession.

She's wearing a long, tight black jumpsuit, and I have to say I find it very sexy. She told me that she really has to pee and won't be able to hold it in until we get to the nightclub. I must admit, with the number of beers I've had, I was not against a pee break. We find a small, dimly-lit pedestrian street, and my sister-in-law starts to pull down her suit, first in her bra, then pulling the rest and thong down to her ankles without any particular discomfort, and releasing a powerful stream of piss. Excited by this situation and wanting to piss myself, I pull my cock out in front of her and start to relieve myself. She finishes first, stands up, giving me a view of her pussy for a few seconds, then gets dressed while I'm still pissing in front of her, she has a good view of my semi hard cock and doesn’t even try to hard that she is looking. She watches me finish my business, I tuck my cock back into my pants, we look at each other with a naughty smile, and set off again to catch up with our group of friends in the nick of time.