Yes the title sounds filthy but that's what LP porn is about.
For both anal creampie scenes and wet scenes I noticed that the trend is to cum and piss inside the model's asshole but not really show it.
It's hot to do it if you're the performer, but if you're the audience, I think it's much more arousing to see it displayed, to see what's actually being done rather than assume it. If a cock is inside her ass, he may or may not be pissing or cumming inside her, you can't tell until it gets out, it's somehow a blocked view and not as appealing. Therefore:
Cumming NOT inside her ass but ON her gaping ass.
Pissing NOT inside her but IN her gaping ass or pussy.
The later is more difficult to achieve without some extra accessory as it's difficult to keep the holes open just by themselves, but I think the visual imagery is very hot.
Piss inside her ass
Piss inside her pussy
Now imagine doing and mixing both fluids inside a model, only to have it squirted out in a glass and the model or another model drinking the cocktail. Thinking of Sara Bell, Brittany Bardot, Anna de Ville, Elen Million or Nataly Gold type of nastiness here.
Common LP, there's lots of filthy creativity to still be explored here