I don’t quite like this, but I have like 1000 soulmate AU’s and divergences planned already, so I hope you enjoy, lmao.
Everyone knew the myth of the soulmate mark on the inside of your wrist. The mark on the inside of your wrist was rare - usually it would end up on the inside of any other body part, but that wasn't important. It was the colors that mattered, because you could have the same soulmark as two different people, in the exact same spot as them, but if the coloring didn't match, then they weren't your romantic soulmate.
Buck found that out early on with Abby. They had the same mark - two hands holding one another's wrists, but neither of their marks started turning a color after they met. Because that was the thing about soulmarks on wrists. They didn't matter if the outline of the mark didn't start turning the same color after you met a person. If you met a person, and they had a matching mark as you, and the outline of the mark didn't begin to turn the same color? They weren't your romantic soulmate.
If it did, then they were. And that was always a good sign. But it wasn't until the marks started getting colored in that that really mattered - because that usually meant that you were emotionally ready to be with your soulmate.
And the day Buck met Eddie Diaz and saw his mark's outline begin to turn a shade of teal - and Eddie's matched? Buck hated him right then and there, because he had been hoping that maybe one day Abby -- but that was never going to happen.
And of course, the world hated Buck because no matter how hard he tried to hate Eddie, he really couldn't. Even after his wife returned.
Buck was sure that Eddie's mark was a mistake, especially when he saw Shannon had the same mark. But her mark was gray, which meant death, and Buck didn't ask any questions, no matter how badly he wanted to.
Of course, as the months went by and his outline started gaining more and more color, Buck -- Buck didn't know what to do or how to feel. Especially since Eddie's outline was already complete and slightly shaded in. Buck didn't know what that meant and a part of him wanted to. But another part of him really didn't want to, either.
And then he was pinned under a fire truck, having a pulmonary embolism, stuck in a tsunami and suing the LAFD, and his outline was complete. That scared Buck more than anything.
But he ignored it, because it wasn't shaded in completely though Buck knew he was head over heels in love with Eddie by that point in time, even with the silence of not talking about their marks deafening them.
And that was more than fine. That was perfectly okay.
And then Abby returned. And at the same time, Eddie's mark became colored completely. And Buck felt completely lost.
More than lost - confused. He knew he loved Eddie but Eddie - Eddie never said anything, never looked at his mark, never -- did anything about their matching marks with the colors but ignore it and Buck felt like that meant that he was for sure going to leave Buck.
And then one day, his parents came by and dropped a bombshell on him and Buck -- all Buck wanted was Eddie. And the next time he looked down at his mark on his wrist, he saw that it was completely colored. And then Buck knew.
He knew that even though his world was turned upside down, his parents were lying to him his entire life, and everything was changing, the one thing that was always steady and there for Buck? Was Eddie and Chris. And Buck knew that it was those thoughts that made him realize he was ready.
Ready for everything with the Diaz family. No matter how terrifying it was.
Which was why, when he entered Eddie's home and stepped out of his shoes, he wasn't surprised to find Eddie waiting for him on the couch, a soft smile on his face, most of the lights turned off.
"Hi," Buck whispers, smiling when Eddie whispers a greeting back before Buck sits next to him and laces their fingers together.
"Thank you for waiting," he whispers and Buck can feel Eddie nod before he raises their hands and kisses his knuckles.
"For you? Until the end of the line," Eddie whispers and Buck smiles, finally feeling at home.
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