I was on Bing images and I find an image I liked and looked at the website it was on, it was scatboru.org. I came to the website and thought "where has this been all my life". This was my best find.
I was like "hey, the big booru I'm a member of doesn't allow scat artworks?" and that is how I literally googled "scat booru" and found this place as the first result, haha.