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.