HaroldRowsdower said: Don't forget Morgana, Mordred's mother! Or Lancelot, he's part of a package deal with Gwen. And having Shirou and Rin brings in Sakura...
Wait, if Saber and Shirou are each a member of the others harem, and Rin and Sakura are both members of both harems, does this mean Iri, Gwen, Lancelot, Morgana, and the Casters are also members of Shirou's harem? Are Taiga, Issei, Rider, Ilya, Ayako, and the track team members of Saber's? If so, is it still polygamy and polyandry? Or is it polyamory?
Plus, we haven't even factored in Kirei, Enkidu, Kayneth, Sola-Ui, Grainne, Kiritsugu, or Kuzuki.