No. 36

Prompt: Any (except Supernatural), any/any, soulmark au in which any writing/tattoos/etc on the hand and forearm also appear on the soul mate's hand/forearm (so when Character A writes Milk, Sugar, Nice biscuits on their arm Character B gets the things before Char A has time to, and if Char B gets F U C K tattooed on his/her knuckles they appear on Char A's knuckles at exactly the wrong moment)
http://comment-fic.livejournal.com/707714.html?thread=93573506#t93573506

Rodney was convinced his future soulmate was some kind of closeted manwhore, because every Friday and Saturday night (and one baffling Tuesday night) all through grad school (when most ordinary peons would be in college), phone numbers appeared on Rodney's right hand, along with girls' names. They vanished fairly quickly afterward, like his future soulmate was washing them off, but if his future soulmate was attracting the likes of Trixie, Dixie, Roxie, and Candy, Rodney wanted a new soulmate, please.

He was slightly mollified when he saw the math formulas that appeared during what would be regular class hours. Whoever his future soulmate was, he was good at math (and Rodney wasn't much for subscribing to stereotypes, but his soulmate had fairly masculine-looking handwriting, and also Rodney was basically bi but mostly gay).

And then Rodney came up with a great idea. He and his soulmate could play a game. Prime/Not Prime. Rodney started, using a six-digit number. The response was rapid and, more importantly, correct. It was a great way to stay awake during boring lectures, even if Rodney looked like a victim of the worst tattoo artist at the end of it.

He would get nervous, sometimes, when his soulmate took a long time to respond. He was even more nervous when his soulmate's handwriting was shaky.

He was terrified when his soulmate didn't answer at all for weeks on end.

They never dared send real messages. What's your name? Where are you? What do you look like? Can we meet?

Just endless rounds of Prime/Not Prime. They upped the ante with Mersenne Primes. Penalized each other (with little frownie faces) for using a number that had already been played before.

One time Rodney woke in the night screaming with agonizing pain in his left shoulder. His soulmate had been shot.

The messages became few and far between when Rodney started working for the Stargate program, because he was incredibly busy, and his soulmate was incredibly busy too, whatever he was doing.

And then he was selected for the Atlantis Expedition, and he hated the messy-haired chopper pilot who had the type of ATA gene expression Rodney would have killed for.

And then, one day, during a very dull meeting, Rodney turned his hand over and wrote a number and the eternal question: Prime/Not Prime? He wondered if their connection lasted across galaxies.

Across the conference table, Sheppard snorted and turned his hand over and picked up the pen he was supposed to be taking notes with and wrote, and ink appeared on Rodney's hand at the same time, Prime. You've used that number before.