A lot of pee talk seems to surround helping guys pee (holding the dick, aiming, etc...), but one of my biggest fantasies is helping a girl pee.
This would probably involve her pulling her panties down and allowing me to hold open her lips while she let out a stream on the toilet or in the shower. This would be even better if she had larger labia lips which hung down and sent the pee spraying everywhere, more to hold onto and play with. I probably wouldn't be able to resist touching her clit