If none of you have ever heard of the adult-rated yuri ova project, then you must watch (or read it) at some point. The anime consists of only three ova episodes, but the manga is longer. The storylines also differ a bit, so it's best to both read and watch it. Be warned though, that it is a bit hard-core, and those who are easily freaked out should nor watch it.

I would put an image, except my I-phone won't let me for some odd reason. Oh well, just check it out. Based on what I've said, along with it's overall rating of four stars, I promise it's good. ;)