The dough looks a little lumpy. Sam's eyes catch on a little butter poking out that Lucifer had forgotten to let soften before adding it. Flour is spread in a mess all over the countertop, and Lucifer's hands, and his shirt, and even Sam's socks from where he's standing a few feet away.
Lucifer looks relaxed and focused, working the dough until it'll be ready to rise. The oven radiates warmth as Sam crosses it to reach Lucifer. He stands at Lucifer's back, head nestled over his shoulder, and Lucifer adjusts slightly so Sam can hug him as he kneads.