ColorblindSoulmates!AU where one of them is genetically colorblind!
I blame Westley (the ever lovely lovelessayase) for this.
You know the “don’t see color until you meet your soulmate"AU? What about someone who is naturally colorblind? Does the world seem tinted differently? Does it stay the same? Angstangstangst.
Ugh, what if they can see color only when they’re truly connected? Like, ColorBlind!Derek doesn’t see color until he’s having sex with Stiles. First time, friends with benefits sex, right? Because Stiles knows Derek’s his soulmate but he thinks he can’t be Derek’s because Derek can’t see color. So he does whatever he can to stay close to him, thinking one day he’ll lose Derek when he finds his soulmate. And anything Derek gives him in the meantime will be worth it. The benefit arrangement happens when Stiles is in college. They kind of just fall into it.
Derek, meanwhile, has been halfway in love with Stiles for years. He knows Stiles can see color, knows he’s not Stiles’s soulmate. He doesn’t know who is, just knows that something must have happened for them not to be with Stiles. But this, this he can give Stiles. A little bliss. When they finally have sex, just as Derek comes, he can see the world in startlingly vibrant colors. And then it’s gone, back to drab dull tones of gray.
He doesn’t tell Stiles. It probably doesn’t mean anything, right? It’s probably just something he made up because he wanted Stiles so bad for so long.
So he keeps quiet, tells no one. And if he mentally catalogues the color of Stiles’ eyes and moles and sex-flushed skin every time they fuck? Well, that’s Derek’s business.
I’m thinking Cora comes back to BH for a visit and brings a stack of articles with her. She’s doing a college paper on mismatched soulmates, because she remembers their parents being that way but loving each other anyway. And she stumbled on all sorts of technical and science and medical papers on people who are naturally colorblind and only see when they’re orgasming with their soulmate. The magic of their bond only goes so far. She’s excited at the prospect of it, sharing all these details with her brother. “Maybe mom and dad weren’t mismatched!” “Derek?” “Derek, what’s wrong?”
Queue more angst because Stiles IS Derek’s soulmate and Derek just “knows” he isn’t Stiles’.
He breaks it off with Stiles and takes off. Cora eventually stomps over to Stiles’ place because her brother left his phone at the loft and Stiles keeps calling and texting him and she doesn’t know what the fuck happened or where he went. So she blames him.
She’s halfway through a fantastically terrifying rant about “what the fuck did you do to my brother” when she realizes that Stiles appears to have been crying. Seriously, what the fuck is that?!
“I’m sorry, Cora. What the fuck did you expect me to do when my soulmate decided he didn’t want me anymore because he probably finally found HIS fucking soulmate and then he didn’t even bother to pretend he’s one of my best fucking friends anymore?! Throw a fucking party?” Stiles snarls, snapping from his silent stare at the ground once she verbalizes her thoughts about Stiles crying.
It hits her then, of course it does. The fucking strange look in her brother’s eyes when she told him about he articles, the widely known knowledge that Stiles had a soulmate who he wasn’t with, knowing that her brother hadn’t purportedly found his own soulmate yet, the theory that her father was naturally colorblind… Fucking genetics.
“Stiles, man the fuck up. I’m pretty sure Derek is colorblind. I’m probably colorblind.”
“I know Derek was fucking colorblind, Cora. How the fuck do you think I knew I wasn’t his soulmate?”
“Oh my god, the two of you have to be fucking made for each other. Stubborn self sacrificing idiot assholes, the both of you.”