Cinnabar and Bort meet for the first time when Cinnabar makes their way to the diamond siblings' residence in hopes of finding Kongo. While Cinnabar knew of the diamonds' reputation, Bort was unaware of Cinnabar's existence due to the accident and is surprised to see a completely unfamiliar gem who isn't a newborn (let alone their senior). Cinnabar is initially wary, unsure that anyone who isn't Kongo would accept them, but Bort (at least partly thanks to Kongo teaching them to assist gems in need) offers Cinnabar to stay at one of the residence's guest rooms for as long as they need. While Bort is busy with their farm and research work, Cinnabar starts feeling like they need to do something in return to not be a freeloader. Bort suggests they tend to Kongo's temple while he is away; when Cinnabar sees the temple in disrepair Bort explains that Kongo's been oddly neglectful of it but that he always allowed renovations. Bort themself just never had enough free time for it and the other diamond siblings are away. This sparks Cinnabar's interest and they start learning crafts that might help with restorations, using both the archives at the residence (books and videotapes containing parts of Kongo's knowledge) and later libraries and museums in the nearby city where Bort takes them. There, Cinnabar also meets some other gems like Peridot and Zircon. As they get more and more into restoration, Cinnabar renovates an unused greenhouse at the residence as well and begins growing flowers there - seeing untouched wild flower meadows on their journey being one of their fondest memories. Eventually they find that making various decorative items, especially with flowers, is what brings them the most joy. Bort suggests they make it their line of work once they are done with the temple.
All the while, the two hang out together, finding common ground in their love for nature and often watch archive videos together. They end up admiring each other's dedication and passion for their respective occupations. Cinnabar is appreciative of Bort's confident, straightforward encouragements, while Bort grows to like Cinnabar's kindness and humility. As Cinnabar recovers from their past traumas they become more outgoing and cheerful, eager to make new friends; Bort puts them into contact with more and more gems until they feel completely at ease and decide where they want to get started with their florist/decorator job. At one point, Cinnabar helps Bort to put out a fire at the farm/lab.
Upon hearing that Kongo has arrived at the capital city (where most gems live, including their leader/representative Euclase, and where the Moon shuttle landing pad is), Bort and Cinnabar travel there, and Cinnabar stays behind as they find a work opportunity there. As Bort leaves however, both realize that they already miss each other. They think of how much they enjoy each others' company and made each others' days brighter. Once at the residence, Bort calls Cinnabar and asks if they can meet up at the earliest opportunity, with Cinnabar readily agreeing. While Bort is as usual confident in their feelings and intentions, Cinnabar is anxious and hopeful that they can truly be together. When their meeting happens, both dress up for a date, with Cinnabar styling their hair into curls; as they see each other, mutual attraction becomes apparent to both. After catching up they find a secluded spot where Bort immediately confesses, and Cinnabar confirms they feel the same, and the two agree to begin dating.
While they don't hide their relationship they don't advertise it either; eventually others gems learn about it, with Dia being both happy for their younger sibling and annoyed at not having been told right away. At a later point, Dia hires Cinnabar to decorate for their wedding to a human lover (a big event due to Dia's celebrity status) and takes note of their passion and skill, the two gems bond as well, even if Cinnabar finds Dia somewhat overwhelming. Bort and Cinnabar continue to meet up in their free time, occasionally traveling together to places relatively undamaged by the disasters; as it becomes apparent that the conditions on alt-Earth are only getting worse, Bort (along with all other scientists) starts working harder and feeling the pressure of their efforts ultimately being futile, while Cinnabar continues spreading joy with their work but feels useless on a larger scale. When the evacuation plan is complete and Bort decides to stay until the latest stage of it to give their jellyfish the best end they can, Cinnabar moves to the diamond residence to be with them. They both say goodbye to the jellies, their bond strengthening further as they support each other. In the end, Kongo, having done one final pilgrimage, picks them up and they all leave for the ru'karan arc ship in a lunarian shuttle.
On the ark ship, Bort continues their scientific works and begins studying xenobiology in preparation for the upcoming Project Homebound. Cinnabar, wishing they could contribute more, decides to try becoming an expedition pilot, which Bort supports, although only after ensuring that this is something Cinnabar genuinely wants, not just feels they must do. Upon arriving to the superstructure the two start living together at one of the standard apartments. Cinnabar opens a flower shop together with a human woman and begin attending the flight academy, aiming for the highest qualifications possible. With the support from Bort and their friends, old and new, they manage to graduate after years of rigourous studies and training.
Before Project Homebound can start officially however, Bort and Cinnabar are privately contacted by the higher-ups and are sent to investigate a mysterious signal. What lies ahead for them? We'll see!
- I never intended to ship them initially, even though they were both my favorite characters from the start, when I first discovered the manga many years ago. In fact, it is exceedingly rare for me to ship characters that aren't a couple in canon - it had only ever happened once before, and even that was mainly due to my co-writer at the time liking the ship in question. It wasn't until my latest rediscovery of HnK that I focused some more on Cinnabar and Bort as their own characters and their interactions, which I thought were nice and sometimes amusing (especially Cinnabar indirectly causing Bort's big haircut). Then I joked about shipping them and before I knew it, I was warming up to the idea of doing it for real. Mainly I like the idea of them being opposites in some ways (that difference in hardness!) but similar in others, down to potentially sharing nature-related interests. However I knew from the start that I wouldn't insert my shipping of them into the canon timeline, not even into the 10 000-year lunarian timeskip. Thus, I imagined them staying friends (and while it's very minor, I like to take them standing near each other in the group photo in Party at the End as something of a confirmation). Instead, in my first crossover-verse I mentioned in my pinned post, I had them both come back to life after Phos's prayer due to some cosmic forces (long story) and becoming a couple afterwards. It was also then that I came up with the idea of a reinforced "skin" layer for their bodies;
- Despite my undying love for Bort's big haircut moment in the manga, I decided to have it happen in a way that's inspired more by the HnK prototype oneshot. To me, Bort's hairstyle change coincides with a new stage of their life (going from fighting to raising jellyfish, something they truly love), as well as shedding the previous burdens (seriously, they must have felt such enormous relief - all that hair must have been as heavy as their body) and in this AU, it happens much earlier. Thus, Bort has a pixie cut for most of it.