A person who is actively interested in the topic of incest.

OR

A person who is actively involved in incestous activity.
My friend Hikaru is a huge fan of Incest anime & literature. He's a cest hound alright.

Or

The Roman emperor Caligula had sex with several of his family members, he sure was a cest hound.
by Big Billy D. April 18, 2018
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