This is one of those AUs where Jyn was raised on Coruscant as Krennic’s ward and meets Rebel agent Cassian when she gets involved in one of his jobs. I’ve apparently decided an early-2000s romcom is a great inspiration for this situation—specifically, The Wedding Date, where a woman hires an escort to be her plus-one for wedding festivities. Because that, to my brain, sounds like an excellent way to get into an exclusive society event an assassinate Orson Krennic. All Cassian has to do is not fall head-over-heals in love with the rich society girl and her hidden depths over the next week or so.
Good luck, bud.
I actually do have a bit of prose about their first meeting:
The caf shop where they meet is classy, but not extravagant. It’s the kind of place someone like Jyn Krennic comes when she’s being discreet. According to the dossier, Orson Krennic’s adoptive daughter, is discreet 80% of the time, and completely outrageous the remaining 20%.
Cassian’s alias is Caldo Gael. Born on Alderaan 27 years ago—same age as Cassian—to a working class family. No higher education degree, but the robust Alderaanian educational system means he has the kind of background in liberal arts that Cassian absolutely doesn’t. It’s a weak spot in the cover. Caldo immigrated to Coruscant and found work as a bartender and at a host club before turning to his current niche. Cassian can’t say he’s ever been a sex worker before, let alone an escort. Krennic's—Jyn's—inquiry said she wasn’t interested in “full service,” though, so Caldo’s job is the same as Cassian’s: be what someone else wants him to be, for as long as the engagement lasts.
She arrives on time, fifteen minutes after Cassian takes a seat next to a hologram of a picturesque mountain view. On Coruscant, a merely ‘classy’ business can’t afford real estate with an actual view of anything but the next skyscraper. Jyn Krennic looks just like the image in the dossier: dark hair, pale skin, short with a slim build and soft facial features. What the holo didn’t convey was the sharpness in her green eyes, the focus of her gaze. She spots him quickly across the room, and something in that gaze sends a quiet spark of interest through him that has nothing to do with the mission. Nothing overwhelming, nothing that will be a distraction, but she stands out.