I mean when you fighting werewolf if player lose against werewolf werewolf pissing on player if player win against werewolf player piss on werewolf and reward from werewolf is semen or werewolf piss?
As of now, that isn't inside the game. The only options are with a wolf, Arion or part of Arion's stalker/bath quest.
The only reward you get from fighting a werewolf is beast cum.
I do hope that the writers and Hyao might add some more options for piss play. I do think that there will be a possibility for it to happen in the future.