Untrustrworthy narration in The History of the Siege of Lisbon

Just a short note today but, funny, as the two main characters (essentially, the only two characters) in Jose Saramago's History of the Siege of Lisbon bond together as a couple - after shy and awkward flirtation, at last Maria Sara comes to visit Raimundo Silva in his apartment, and after some awkward conversation and shy fumblings they kiss, embrace, drift toward the bedroom, and make love - and we are led to believe this may be the first time in the 40-something year old RS's life that he has had sex he didn't have to purchase. What's funny is that, as this relationship slowly heats up to the boiling point, the narrative RS is writing - his revisionist history of the siege of Lisbon - becomes increasingly sexual: what started out as an examination of the military strategy for the Portuguese assault on the Moorish-held city now is beginning to focus on the yearnings that various soldiers feel for the camp followers and what the narrator quaintly calls the concubines accompanying the Portuguese forces. So what we see, in a sense, is how the personal live - yearnings, desires, dreams, troubles - of the author, or the historian, inevitably color the writing, lead to certain choices, changes of focus, and so on - a further super-European examination of subjectivity and the untrustworthy nature of narrative and of fiction. I hope the novel is not just a vast statement about relativism, a book without an objective standpoint and without values, but that said it remains a provocative and fascinating novel, dense with ideas, concepts, and conceits, but not without its own humor and not without two strong central characters, especially RS, a lonely sad sack who at last, or so it seems, finds happiness.