It doesn't happen often but the amount of sex did not take away from the development of the plot and characters, warranted there could have been more so that the relationship wasn't so sudden. The action of the plot really leveled everything out and it provided opportunities to get to know Lissa and Casimir as individuals and as a couple. While I get that Lissa's background is a central focus of the story the brothers have been talking about the dangers of the Sorbacovs for so long and it was handled in a single chapter. Luigi's last minute bout of conscious didn't seem to make sense either for his character.