[ He'll have his chance to jump Sasuke's bones when he's in a kimono. The soft moe Sasuke will be even stronger then, and Yukimura will be in better shape. ]

Yes, they had the ability to shapeshift and fell in love with a human. Many times the human didn't know, and when they learned their true nature... the youkai had to leave. Or like in the case of a kitsune, could only come back to her love at night.

A few stories had tigers. The tiger was a protector, and his identity was found out when he protected his lover. But he didn't care if he was shunned. He was going to protect his bride. I think they got to stay together in the end.