Ever wonder what'd happen is  taluthus willing allowed another demonic creature to take refuge and process the kitsune? Well now we know, a god forbidden fusion between the demon and it's host.

This monstrous concoction of a form is called BlackSune, a fusion between a demon who goes by the name BlackEye (AKA Black) and this Nomsune. Blacksune retains all the abilities of both his former selves only he's much for powerful than as a combine form, which many abilities such as free reign in transformations, energy bursts, teleportation, levitation, super speeds and strength and the ability to manipulate the state of one's mind.

This form is only accessible when the two are together, which means neither can transform into this without the other. In this form BlackSune will have a multiple personality but once he stays in this form for too long the two personalities start to become a single mind. It's quite possible for BlackSune to become a permanent being but Black and Tal never dared to venture that far ( they really love their personal lives to risk it lol)

This form is much more aggressive and sadistic than your average nomsune forms so you better double or triple check to be sure that you're on his good side >:3

a brief look a BlackEye for those unfamiliar to the character;
http://67.media.tumblr.com/dbcc3495.....hvzo1_1280.jpg

Taluthus belongs to  taluthus
Blackeye belongs to  greatwhitejill

Colourless sketch version (to see details better);
http://www.furaffinity.net/view/21106156/