AU where Jon Elias and Martin all end up Somewhere Else. Jon is stuck in a miserable shit relationship with Martin where they deeply resent each other but have absolutely nothing else, meanwhile Elias has fucked off to seduce and corrupt this universe’s Jon. Like a year later he shows up on the doorstep of our Jon (while Martin is out) and shows Jon how happy he could make Jon, how happy he has already made Jon.

Yes it involves a threesome. How did you know?