He smiles at the grumbling, waiting until Castiel is able to return the kisses before pushing his tongue into the other man's mouth and deepening the kiss.

After several moments, he pulls back, leaning over Castiel with a smile as he reaches up to stroke his hair. "Morning," he murmurs softly. "How are you feeling?"

While Castiel's sucked him off a few times since the punishment, there hadn't been any penetrative sex. Because what Sam wanted had to be done on Castiel's back.