If you piss it will be liquid and you'll pee alot more cum
your piss will either be clear if you drink plenty fo water and are healthy and if normal it will be of a yellow tint.
Cum, is white and thick like a gob of snotters you've just spat out your mouth. (snotters...Boogers, ya know)
it will be white and will come 'shooting' out when you come!
If you peeing whilst comming, before you jerk off go take a piss and empty your bladder.