One of the best ever!
I think that this is better than Klacid's work on hentai, although it is obvious that stuff gets more views. I loved this submission not just because it is insane, but because the animation itself is so wonderfully animated. Every single different item just seems to have a different animation style to it. It only fits that Rei would be in such a crazy and incomprehensible cartoon. I was kind of reminded of "Arfenhouse", but this is great in its own right. Even the voices seem to match the characters well!