The only tags ao_usagi put on this image are touhou, yuugi, and r-18, none of the other tags count for anything. Please do not get into an edit war over tags the artist didn't even use. You can tell which tags an artist uploaded with because they're marked with a *.
I'm still fairly certain this isn't futanari. It isn't tagged that way on Pixiv and it could just as easily be the clitoris (which is possible, after all look at her nipples). Either way, we do not have ample evidence of either futanari or erect_clitoris, so I'm removing the tags for now.