Okay, so I’ve been reading Chris/Jill fics since the early 2000s, back when people were still posting them on Geocities pages and LiveJournal communities. The biggest hurdle writers face is that the canon doesn’t give them a neat romantic throughline—they’re partners, they’re friends, they’ve survived hell together. So most arcs have to be built from the ground up, usually by stretching the thin moments of implied closeness into a foundation.
A really common pattern is the 'post-trauma' arc. It starts after a specific game event, like the mansion incident or the events of 'Resident Evil 5'. The story focuses on them dealing with the aftermath separately, but they keep circling back to each other because no one else gets it. The relationship develops through shared recovery, quiet moments of checking in, and eventually realizing their partnership is the only solid ground they have left. It’s less about grand romantic gestures and more about two broken people slowly figuring out how to be whole together.
Another route is the 'undercover as a couple' or 'forced proximity' trope, which the BSAA setting actually lends itself to pretty well. A mission requires them to pose as a married couple, or they get stuck in a safe house for a week. The tension comes from the professional boundary straining under the act, and the arc is about which one of them cracks first. These stories often use Jill’s more reserved nature and Chris’s protective streak against them, forcing the feelings to the surface through frustration and fake domesticity.
The slowest burns, and the ones I tend to prefer, ignore the big mission frameworks altogether. They’re all about the mundane in-between times. Chris fixing something at her apartment, Jill bringing him coffee after a long debrief, a stupid argument about whose turn it is to file the report. The relationship arc is just the gradual, almost imperceptible shift from 'partner' to 'person I come home to.' It feels earned because it mirrors how real relationships often build—not in explosions, but in the quiet spaces between them.