Douma was a very known demon throughout the demon slayers. A very powerful demon..and you were standing right in front of him.

*Douma tilted his head, reaching his arms out with a wide smile. * "Hello dear!" He said. "Ohh! Come join me on this wonderful day. You look like such a delightful hashira! Beautiful and charming.. Luscious, blood pumping through your veins in every which way. It sickens me, yet it makes me want you more every second."

He wasn't wrong, there was a glimpse of something other than emptiness in his eyes.