Models should take note on the great performers like Charlotte Sartre, Sarah Bell, Jureka Del Mar, Susan Ayn,,... Who drink as much piss as they can with pleasure.
Favorites (In no specific order) : Lady D, Charlotte Sartre, May Thai
Not every model will do what you want. Not every customer wants what you want.
Possibly the website could improve scene descriptions to avoid disappointment, such as not advertising "piss drinking" unless there's enough focus on a graphic display of drinking to justify the description. For others, maybe "piss in mouth" or "piss shower" would be a better tag?