I try to avoid fan art with these themes since I think it's cooler if they're completely original. This idea fit too well to pass up, though, and I think it stands on its own just fine even to those who have no clue what the fan art is for.
For the uninformed, this is inspired by There She Is, which is an astounding series done by SamBakZa that is cute, surprisingly emotional, and deeply beautiful. I really recommend you take the time to watch them. They're worth it. http://www.sambakza.net/amalloc/tteotta_main.htm
Doki and Nabi are copyrighted by SamBakZa.
Sorry for not CCing this piece. I have no idea how copyright works when it comes to fan art so I figure it's best to keep it simple.