You must be talking about the "Silver Steele Orgy" scene from "Ready To Unload" by TIM (about "dog cum slush").
While I was looking into what TIM did regarding this fetish, interestingly, they seem to have made the "Making the Devils Dick" video some time ago, though now I can't find it on their site. It used to be available here on GT, but was taken down now.
The good news is, the Internet forgets nothing:
https://xhamster.com/videos/screwing-time-9076900
Check it out, I think it has what you need.