Dean's POV:
"So you're tellin me we have no idea what this thing is?" I rumbled into the phone. Cas sat beside me in the Impala, as we drove along some nameless state highway. "Not a clue, I mean- Dean we've never faced anything like this before. Whatever it is, it's targeting Omegas specifically. Just.. just get Cas back to the bunker, ok?" Sam said tiredly. "Yeah. Omegas. Got it. We'll be there soon Sammy." I replied and hung up. Cas stared out of the window. "You get all that?" I asked. No response. "Cas!" Nothing. "Castielle!" I reached out and touched the small woman's arm. She hissed in a breathe and scooted far as she could away from me. Her blue eyes wide and unfocused. "Cas, what the hell?" I asked her. Shaking her head rapidly, she whispered, "I- I don't know. Your touch felt.. different." Her head cocked to the side. A lock of dark hair falling into her face. "Different how?" I asked. "I'm not sure. It- your- umm Dean?" She stammered. "We may have a problem." She warned and went stiff as a board in the passenger seat. "Wha-" I cut myself off as I smelled it. "Is that- are you?" I tried not to breathe through my nose. "It appears I'm going into heat." Cas said quietly, her normally husky voice had become a sensual purr. "What about your suppressants?" I asked quickly. "I've been taking them. They've failed." She said matter of factly. "Yeah- that's a given Cas! We're in the middle of freakin nowhere! And you're in heat. You're essentially broadcasting a neon beacon, to every unmated Alpha in the area, that you're ripe for the picking!" I rumbled. "You'll protect me, Dean. Of that, I am certain." She replied. "You're missing the point here, girl wonder. I'm an Alpha. An unmated Alpha, Cas." I stressed. She cocked her head to the side, confused. "I'm aware of your biological ranking Dean, but what does that have to do with anything?" She said. I didn't know whether to throttle her or kiss her. Kissing her would be a very very bad idea. "It means," I growled, "Who's gonna protect you from me? Huh? What are you gonna do when your heat cycle really starts kickin your ass? When you're so mindless with the need to be knotted, that you can't even talk? Or walk? What then? We've got a 3 day drive ahead of us Cas, and being cooped up in a confined space isn't the best idea for us." I rumbled, her scent already making my inner Alpha sit up and take notice. My voice was deeper, rougher. My scent stronger. Shit. Her breathing picked up, and goddamn if her pheromones didn't spike. "Dean..." she purred, her blue eyes fiery.