Board Thread:General Discussion/@comment-6192846-20151223075113/@comment-25932613-20160129200835

They are not genetically related at all to our knowledge so their relationship is based on their bonds and although Kiril most likely only saw their bond as brother and sister Irina obviously saw it as more. It's not technically incest but it is still imagining a relationship with someone you grew up with who was raised as your brother and people still consider it incest based on their views.