If you don't know the Transformers lore, Cybertron is these giant robots' planet and the Quintessons are an alien species they had to deal with. However, in my story Transformers are human-sized, taking after the changes shown in the Beast Wars Transformers series; and the Eva brothers don't transform.
These three cyborgs look like Eva 00, Eva 02 and Eva 01, and they're called respectively 03, 02 and 01, aged 18, 15 and 6. During they journey in space, they run into a wormhole and they arrive on Earth in an alternate universe: the post-Third Impact Earth.
For a summary, they meet the Children, who are now almost 17, and they develop close bonds with them, especially since they share some personality traits. 03 and 02 fall in love romantically, respectively, with Rei and Asuka, while Shinji and little 01 develop a father/son bond. Eventually, 01 turns out to be the only one who can save Cybertron from the Quintessons (and Earth too, since the alien race decides to use the wormhole to their own advantage) because he's been chosen by the Transformers' demigod Primus. The Children with Misato and the others go to Cybertron with the Evangelion brothers to help them fight against the Quintessons and to get 01 safely to Vector Sigma (a sacred place for the Transformers) so he can fuse with it and save the world(s).
I always liked the idea of "mirror universes", at least to some extent of mirroring, and I had fun playing with the ideas. The crossover part was so much fun, too!
Eventually, for various reasons, I decided to donate this fancomic/fanfic to my friend Lia Dospetti, who decided to complete it and turn it into original work, with different settings and different characters, but keeping the structure and some of my prose. I'm more than okay with anything she decides to do with it, but I asked if I could translate (from Italian) and share some fragments of the story with you guys, to which she said yes.
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All that said, in the spoiler below you'll find the link to the first fragment, where Asuka and 02 Evangelion make love for the first time [gentle but NSFW]:
SPOILER: Show