Edited
Plot: You have been always Baby (Dean's Impala) and one day you turn into a human and you and Dean do... stuff. Plus if Baby is the name here, it's your name. Smut included. And yes, he had the time of his life with a car.
Dean's POV
"Sam where's my Ba— who are you?!" I said taking out my gun and pointing it and the girl with silver hair and black short dress. "Woah woah woah Dean, it's me, Baby." she said throwing her hands up in surrender and looking at her legs. She looked at me and lifted up her dress.
"See? Your initials. You carved it on me when you were kids." It looked like a carved tattoo. "And man did it hurt." she sighed smiling and putting her hand to her waist.
"Dean? What are you—" Sam saw her and took out his gun.
Baby's POV
"Woah, woah, woah, hold on guys!" I said flaling my hands up in surrender. "Drop down." Sam ordered.
I knelt down on the ground with my hands in the air. Sam ran to me and put my hands behind my back. Dean grabbed his flask and threw water at me face. I flinched and backed my face but the water still hit me. He grabbed his silver blade and dragged it along my skin. I hissed because it hurt.
"You're leaving a scratch there boys." I chuckled. "Baby?" Dean tilted his head. I nodded my head and Sam's grip loosened. Dean hugged me tight and I hugged him back. Sam also hugged my waist and we three hugged.
"How did you become?" Sam said gesturing to me and my body. "No idea." I said leaning forward and shaking my head no.
My Chevrolet necklace dangled as I stood up again properly. "Come in!" Dean said gesturing me to go inside the bunker, out of the garage. Sam took off his flannel and covered me with it. I smiled up at him and we got inside the bunker. I sat on the chair in the war room when Sam disappeared. Dean sat next to me grinning and Sam appeared again with a mug in his hands. He gave it to me and it was a warm tan colored liquid. I took a sip of it and tasted like gas which was like heaven for us cars. I chugged it down halfway set it on the table.
"What does it feel?"
"What happened?"
"I'm so sorry Baby I didn't mean to touch you."
"I'm sorry if I ever scratched you." Sam and Dean continuously said.
"Woah woah hold on guys. I'll answer each question one at a time," I laughed.
"So Dean what does what feel like?"
"When we get inside you?"
"You're on my back, and it feels like I'm carrying two or more adlut babies."
"What happened?"
"I just found myself on the corner of the garage leaning against a corner."
"I didn't mean to touch you Baby."
"Don't worry Dean,"
"But what does it feel like?"
"What does what feel like?"
"When Dean gets under you and fixes you."