W...t...f... lol, this was a bit too explicit for me. Even if they were shaped like girls, that still basically ended up being 5 pages or so of cock rubbing. Can't think of this as real yuri at all...
As for the tags though, I do sorta wonder why "het" would be there? As far as what happened, the opposite pairs didn't really interact at all. I'd see it more as a straight up yaoi/yuri work.