My Cat poops ONLY in my bathroom sink! How do we get him to stop?

I have 4 cats. And for some weird reason, my kitty (lovingly named Demon) always does his business in the bathroom sink. Don’t get me wrong, peeing down the drain is great, and less litter i have to scoop, But i need him to stop pooping in there!
When we close off the bathroom door, he just goes on the little ramp leading to the litter box. How can we fix this?
Yes, we have 2 litter boxes. They get scooped every day.

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