OOC: Guys, I know I had said I'd update eventually, but mostly my interest has waned. For the sake of giving you all closure about what happens at the end, I'm just gonna jot down the bullet point version. If ya'll have further questions about some of my alternate plans and such, feel free to put those in the ask box.
It turns out that Obsidian is not being shocked by Yellow Diamond, but by White Diamond piloting the Diamond mech, while she is copying Yellow's powers. Obsidian tries to fight back as much as possible but is destabilized into Alexandrite and Steven.
White Diamond tries to kidnap Steven into her ship but Connie and Lion manage to rescue him. She also tries to kidnap Yellow and Blue as well.
Alexandrite pushes Yellow and Blue out of the way while the Diamond mech's foot crushes her and she completely loses her form.
Yellow, Blue, and Steven all fuse into Prismatic Diamond, a Diamond containing all colors in the rainbow and she fights with White Diamond.
The two Diamonds have a Beam-O-War with each other and White Diamond ends up getting corrupted, and Rainbow Diamond bubbles her.
Here is some concept art, although I do not feel quite satisfied with the look of Rainbow Diamond so if I had completed the story, I probably would have done something different.
Some of my concept art goes back to 2018
The Earth is finally safe, but Garnet, Amethyst, and Pearl have been shattered. Steven's tears heal them, but I did actually have a version of the story that is longer that ends up with the fight going to Homeworld, and they are healed, but they have been rejuvenated and lost their memories.
Actually in the longer version, Lapis would have used her water powers to lift the Cluster out of the Earth, through space, back to Homeworld, and White Diamond would have been poofed
In either case, Connie's parents arrive, worried, along with Greg, and while they are relieved that their children are safe, Steven and Connie end up revealing that they were pretty badly hurt in the fight with the reveal of just how much blood was on Connie's sword.
Steven and Connie's parents make the hard decision to move from Beach City, and even though the kids protest, ultimately the Maheswarens and Greg have the final say, however they are allowed a last day to pack up their things and say goodbye to everyone.
They all have a giant pizza party to celebrate the Earth being free, and Steven presents Yellow and Blue Diamond with the gift of two yellow and blue star shaped necklaces- telling them that even though their place is on Homeworld to sort things out in Era 3 and make a life better for their gems, they're now considered honorary Crystal Gems.
Many tears are shed as Steven is surrounded by a massive group hug.
Life is very hard for Steven after leaving Beach City due to missing his friends. But slowly over time, being away allows both him and Connie to heal from their traumatic childhood experiences, and they're both able to attend school together and get the professional help that they need. The Crystal Gems also make frequent visits to help support Steven as well, but he hasn't been back to the temple since moving.
Then, finally in the epilogue, Steven and Connie are engaged to be married. As young adults, not only do they revisit Beach City for old time's sake, but they also make a trip to Homeworld where Steven is able to see how much Homeworld has been restored.
At this time, he decides with Yellow and Blue Diamond that it's finally time to confront White Diamond and try to heal her. Their Pearls hold keys to the vault where she's kept so that the three of them all have to agree that it's safe to do so.
It is a struggle as a corrupted White Diamond emerges from the bubble, but with Steven's sense of adult maturity, his successful road to recovery, and the support of Yellow and Blue Diamond, the three of them are able to get through to her and finally accept herself, flaws and all. When she is healed, all four of them end up fusing into Prismatic Diamond (or you could call her Paragon which is a popular theory I've heard of)
I don't think I made as many pictures of her, but here's an unfinished concept anyways
Paragon unleashes a healing waves of light over the Earth, and all corrupted gems that still have not been recovered by the Crystal Gems are cured by this wave. Seeing this, the Crystal Gems back on Earth unbubble every single corrupted gem, and they are restored as well.
The 4 Diamonds unfuse, and while White is hesitant to adjust to this new reality that she lives in, Blue and Yellow promise to be there to support her.
Yellow Diamond herself reflects on her past and the things she's learned though learning to love Steven and her fellow Diamonds and gems at the same time.
Here's an epilogue I wrote down:
And that's it! Let me know if you want the bullet points for the longer version of the story where White Diamond does end up taking Steven, Yellow, and Blue to Homeworld!