From under the rolled up sleeves of Castiel's sweater Dean could just see the wings that tattooed his skin, the tips of feathers done in a dark ink. He didn't need to see the rest to know each line, each feather and detail. To know the way the dark ink made Cas's tanned skin seem to glow, to know how the feathers had been engraved along his shoulder blades and down his arms to just below his elbows, or the way Jack's name had been done cursivly in one of the feathers. Dean knew every inch of that tattoo, and part of him wondered how long he'd know every inch of that tattoo. How long he'd know every inch of the other's body. How long he'd know every shade of blue that danced through his irises. How long he'd remember the way Cas's hands would glide his body. How long it would take before he could look to Castiel, and not feel the heartache of everything he'd lost. - Or, where it's been almost a year since Dean and Castiel have broken up and struggle with joint custody, lingering feelings, and the Christmas season