For one thing, he can't control it. He tries to hide his true emotions but his tail betrays him and reveals them, thus he keeps it hidden.
When Jude kidnaps Cardan and he exclaims he has a tail "Would you like to see it!" He's not just being nervous and funny, he's showing that he's going to be completely truthful with her.
The tail is described as thin and mostly hairless except for a tuft of hair at the end. You know who else has a thin mostly hairless tail with a tuft of hair at the end? A lion! And Cardan's tail behaves like it belongs to a cat.
For instance, the first time Jude and Cardan are intimiate, she describes pulling down his pants and
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My dude, tail curled up against the body is a sign of vulnerability. And though my man had the initiative and experience, he felt vulnerable against Jude. In his mind he was exposing his feelings to this powerful woman that seemed to not be hurt by anyone or anything. In a later chapter he is hurt when she acts as though that intimate moment meant nothing to her.
The second time they're intimate, Jude describes the tail as
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Lashing back and forth is an aggresive move. It is done when hunting and ready to pounce. My girl had Cardan going. That man was ready to attack.
Then when they're getting down to business, the tail
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Baby, that's possessivness. That tail is saying what Cardan is screaming inside, MINE! That's his woman. The tail wrapping around another being is also done when the pair is bonded. It means they have accepted you as part of them.Jude isn't just his woman, his wife; she has become a part of him .
Also, in question of if the tail wags from side to side when he sees Jude, it probably doesn't. That's dog tail behavior. Cardan's tail probably shoots straight up in the air with the tuft end in a hook like a cat's does when it sees it's favorite people and friends.
