Hello!
I per***ally use Clip Studio Paint assets (it is specifically made for CSP, so I don't know if the backgrounds there could be used outside of the program. I have never tried it before). But it works very well because it even has 3d backgrounds, so you can move the camera around according to what you want the setting to be.

It is the only place I know I can download (and purchase, if necessary) backgrounds safely knowing I can use them.

hope this helps
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IChocolateDonutI I also use clipstudio, but I've never tried the 3D models, thanks for the remark

thank you Moldrad, this will help me a lot

This is very helpful! Thank you Moldrad.

They're mostly screen grabs from Hentai dating sim games

External ?