ECHOES IN OUR BLOOD FUN FACTS!
If Eurydice had been born alone without Paul, these things would have happened:
The Emperor wouldn't have bothered killing Leto. Without an heir to sustain him, Leto's bloodline would die with him. Unless Leto chose to marry, the Emperor would have left well enough alone.
Eurydice would have been taken to the Convent at the age of seven, like in EIOB, but she would have fought harder to stay. Since Leto didn't have an heir, Eurydice felt like she had to fill that role as his only child.
LETO WOULD HAVE THREATENED WAR ON THE BENE GESSERIT IF THEY TOOK EURYDICE.
Leto would eventually be forced to yield, but this would add pressure to Leto to find a wife and have an heir to take on Caladan, but the Order would intervene at every turn.
Eurydice and Feyd's marriage would have bridged the feud between families. Without a male heir at Leto's disposal, the Baron prefers to keep him alive, solely so Leto can watch Eurydice lose her Atreides identity by bearing Harkonnen children and furthering the legacy.
Eurydice would have 10000% murdered the Baron no matter what.
... Feyd figures out where Eurydice is sooner, since she doesn't have Paul's mind to connect with, meaning he casually stages a mini-coup against the Baron to gather up enough resources to invade Chapterhouse to get her.
Isolde is very tempted just to hand Eurydice over. But she has to solve a conflict, unfortunately.
Feyd is twelve at this point AND NOT LEAVING WITHOUT EURYDICE.
The Reverend Mother allows them to meet.
Feyd tries to kiss her because he's overwhelmed and Eurydice slaps him and calls him out for tracking her down and basically bringing a whole ass army. This is when it's explained how they're actually betrothed and Feyd, being the genius he is, states it'd make more sense for him to pack her up and bring her back to Giedi Prime so they can get to know each other, she can finish her training there, and then they can get married.
Isolde supports this plan.
The Reverend Mother yields to it, figuring this might be a good way to tame Eurydice.
... it does not.
Eurydice and Feyd's relationship growing up together on Giedi Prime can be summed up as a "this is my idea" song from swan princess
it's cute okay, definitely a lil less angst than echoes in our blood
Maybe, just maybe, i'll write a fanfiction of my fanfiction with this story. it'd probably be short and domestic af. Probably ten chapters at maximum, depending on where it goes.
... thoughts? A fanfiction of EIOB once EIOB is completed? X'DD