In the words of my fave cat vine to date: yaaasssss
Dean froze, his arm raised to smack Cas again, his eyes going a little wider than before. “What?” he asked slowly.
"Impala…" Castiel whimpered, tears streaming down his face, real ones, not the ones he had during his scenes. Real painful tears.
The safeword. Cas hadn’t safeworded him in months, not since the first time they had tried going a little rougher. Immediately, Dean untied Castiel’s wrists and helped him lay down on his stomach along the bed, not saying anything yet, just allowing him to relax.
"I’ll be right back," Dean said, lightly touching Castiel’s hair, before darting over to the bathroom to get some water in a glass and a few pain pills to help Cas with any pain he was in. He was just glad Cas had used the safeword and hadn’t pushed himself too far.
"Dean?" Castiel called, sounding panicked. "Dean?!"
"I’m right here, Baby, I’m right here." Dean hurried out of the bathroom and helped Cas sit up so he could swallow the pills and rest. "You want me to get your blanket?"
Castiel nodded and continued to sip his water. “Please,” he muttered.
Dean kissed Castiel’s temple and walked over to the armchair and lifted the heavy afghan to wrap around Castiel’s naked body. “There,” he said, once Cas was safely wrapped up, “all warm and cozy again. You’re like a little Cas burrito.”
Castiel smiled and blushed, looking as shy as when they had first met. “I’m sorry, Dean, I just- it was really hurting-.”
"Baby," Dean grasped Castiel’s hands once he set the glass down. "Don’t you ever apologize for using the safeword, that’s why we have it. I don’t want to hurt you, okay?” Another kiss for Castiel’s head, this time along his forehead. “I love you, Baby, and I want you to be safe and happy, okay?”
Castiel nodded and slid into Dean’s arms, allowing for some snuggle time. “I love you too, Dean.”
Dean smiled, resting his chin along the top of Cas’ head, leaning back into the pillows so they could both take a nap. “You want me to wake you up or you want to just nap the rest of the afternoon?”
"Mmmm," Castiel hummed. "Nap."
"I thought so."