Do you know this Manga?

I'm looking for a specific yaoi manga but I don't remember the name. Its the story of two brothers with animal counterparts. The younger brother is blonde and has a snake counterpart. His best friend has dark hair, wears glasses and has a (hidden) white dog counterpart. I think the best friend's name is Shin. The eldest brother falls in love with a junior classmate who's inner animal counterpart is a rare cat. This manga is incomplete...DO you know the name?