This == win.

That's not Arcueid.

What makes you say that.

The fact she has a tail and cat ears. I'm pretty sure it's supposed to be Nanako / Seven, the guardian of Ciel's Seventh Scripture.

I doubt it. Nanako is always depicted with hooves. See for yourself: http://miezaru.donmai.us/post/list/tags/nanako+-mahoraba

Nekomimi Ciel + Arcueid isn't unusual at all.

am I doing this right
http://miezaru.donmai.us/post/list/tags/necoarc

it's arc- she has the trademark folded over lock of hair in front