They make a deal, eventually: Sam is still in there, of course, but he’s not a tortured, screaming wreck who’s forced to look on as Lucifer wreaks havoc on an unsuspecting world, and Gabriel sticks around for good. That’s the deal, flawed and incomplete as it is, but it seems to work well enough, and Lucifer has yet to kill anyone terribly important, which is all that anyone can ask for, really.
As promised, Gabriel hangs around, and ends up spending a lot of time lounging around Lucifer’s penthouse suite with little to no clothes on, much to the confusion of his brother, and the delight of Sam. Sometimes he even keeps his wings out, which sends Sam into fits of something like excited ecstasy, and which Lucifer sort of goes along with, confused, amused, willing to keep the human soul within him happy if it means that Gabriel will stay with him.
“You have such beautiful wings,” and the voice that comes from Sam’s mouth is twinned, Sam’s tone and words but with Lucifer’s inflections, a strange sound that nonetheless makes Gabriel arch his back and spread his wings wider, waiting in anticipation for the single hand of two separate beings to run through his feathers.