Heartwarming / Shatterheart

• When Kurogane gives Syaoran the mashed bananas laced with painkillers as apology, saying, "Don't act like your life doesn't matter to me". It's especially important since at that point the rest of group is still actively shunning Syaoran.
• Kurogane tends to Syaoran's injuries a number of times throughout the story, each time showing a surprising degree of tenderness.
  • When Syaoran returns the favor in Nihon, taking Kurogane to one of the castle's outdoor baths to wash out the wounds Kurogane acquired in Ceres.
• When Fai confronts Syaoran about his drinking problem, it shows that Fai is getting over his anger toward Syaoran in order to help him.
• When Kurogane cuddles with Syaoran for the first time since his kidnapping, finally admitting to himself that he loves Syaoran.
• When Kurogane forgoes his pride and straight up confesses his love for Syaoran and admits to being scared of losing him after the disastrous Chess Finals.
• When Kurogane gives Syaoran his jacket after Syaoran was nearly run over by a car.
• Despite getting temporary amnesia, Kurogane regains his memory by looking at Syaoran.
• Fai and Syaoran finally making amends after months of being at odds with each other.
• The kimono-fitting scene. Syaoran is trying out different kimonos and he finds one that he and Kurogane definitely like.
• Oddly enough, many of the sex scenes. Kurogane is exceedingly gentle with Syaoran, particularly early on, when Syaoran is at his most vulnerable.
• After the final battle, while Syaoran is comatose, sorting out his memories and the memories of his father, he reflects on all the reasons he loves Kurogane. This line, in particular, really sums it up:
  Syaoran remembers falling in love, and it is the most wonderful thing in the world.
• Syaoran proposing to Kurogane in Suwa.