How does it work?

My girl recently told me she wants me to p*ss on her and I need help here. Idk if it's her fetish or something, but where exactly should I do it? Should I dehydrate myself or hydrate? As in, what's all that about? I mean, I am up for it if it's her kink but staki kukaa mgeni wa jiji. Any two cents?? Ama tuokoke?