Me: This was supposed to be one chapter... and then I forgot to put "complete" on it. Then I decided to leave it for awhile and see if a second chapter would pop up, which it did!
Sam wasn't likely to tell Dean any time soon but he remembered Castiel from when he was younger. He didn't know how but he did. He remembered the intensity of the blue eyes and he remembered Castiel interacted with his brother. Sam didn't understand how he remembered when he wasn't even six months old. He just remembered Castiel holding him and Dean pouting.
"Cas!" Dean squealed.
"Hello, Dean," Castiel smiled. "Welcome home." He bent down so that Dean could run into his arms, hugging him tightly. Sam blew bubbles with his spit, looking curiously at his big brother and the angel from his baby bouncer. The baby was curious at the interaction from his big brother and Cas. Sam didn't know what Cas' long name was but Dean called him Cas so it seemed to be okay. He liked his brother's angel. Sam didn't understand about angels but he knew that his big brother Dean really loved Cas.
"You met Sammy," Dean said.
"Yes, I met Sammy," Castiel nodded. Dean frowned and crossed his arms and then uncrossed them, walking towards the fridge. Sam gurgled and squealed as his big brother walked away from him.
"Hold on, Sammy," Dean said. "I'm getting juice." He reached into the fridge and Cas bent down to pick Dean up but Dean squirmed away. Cas looked confused and a little hurt.
"Dean?" Cas asked. "What is the matter?"
"Nothing!" Dean said. Sammy looked at his brother. His brother had different faces for different things like sad and happy and now lying.
"Dean," Cas said a little bit more firmly. Dean looked at his feet, suddenly bashful.
"You're gonna love Sammy more then me, right? You're gonna stop loving me..." Dean asked.
"No, Dean, I am not," Cas said firmly, bending down so that he was Dean's height. "I will grow to love Sammy. But I will always love you." Dean looked up, staring into Castiel's blue eyes.
"Promise?"
"Promise," Cas said. Dean held out his pinky and when Castiel held out his pinky, looking confused, Dean connected their pinkies.
"Pinky Promise," Dean said.
"Pinky Promise," Cas repeated.
"Cross my heart and hope to die," Dean said.
"Dean, you should not-"
"Cas!" Dean said.
"Cas, just say it," Mommy came in then, smiling. Castiel frowned at Mary but he repeated the phrase as she picked up Sammy. After Castiel repeated the phrase, Dean threw himself into Cas' arms.
"See that, Sammy? There's an angel in the room," Mary smiled.
"Hello, Sam," Castiel said.
"Hey, Cas," Sam said. He felt the hair on the back of his neck prick up, and sure enough, Castiel was watching him. "Cas, do you need something?"
"You remember that?" Castiel asked.
"R-remember what?" Sam asked.
"You know what I mean, Sam. Don't worry. I won't tell Dean," Castiel said. "Is something else the matter?"
"N-no. Nothing," Sam said.
"Sam," Castiel said, more sternly. Sam sighed and then jumped when Castiel walked up to him, peering up at him and tilting his head with a frown. "You are wondering why Dean has an angel looking out for him and not you. You... you are wondering if I am disappointed in you."
"How did you know that?" Sam asked. "Dude, don't go poking around in my thoughts!"
"My apologies. Sam, Dean has a present angel looking out for him because without one, he would surely be lost," Castiel said.
"What do you mean 'present angel'?" Sam frowned.
"You and Dean were always of great importance. Dean was the older and therefore burdened with more responsibility. I was sent to him to help him along his path for as long as I could. I came back as soon as I was able," Castiel said.
"Why did you leave?" Sam asked.
"After... after your mother died, he could no longer perceive my true visage and that was how I was able to go to him. It was... not recommended we take a vessel," Castiel said. "So I had to wait until I could take a vessel to go to him."
"And... you're disappointed in me?" Castiel regarded him for a moment.
"Certain influences had led you to certain places. I am not disappointed in the man you have become now," Castiel said. Sam opened his mouth to respond but then he blinked and Castiel was gone.
"Hello, Sam. My name is Castiel," the angel said. "I am going to watch over you and your brother from now on." He touched Sam's cheek and Sam reached for his finger, gripping it gently. Castiel tilted his head and relinquished control of his finger to Sam. He and Sam had a staring match until Mary came in.
"Dean will be home soon, Cas," Mary told him. Castiel glanced at the clock and nodded. Sam began crying and Castiel pulled his finger away, alarmed. "Can you bring him over for me? He's just hungry." Castiel nodded and picked Sam up, bringing him to Mary. Mary finished breast feeding him when they heard a knock on the door.
"Dean's home," Mary smiled, putting Sam back in his crib. Mary walked to open the door and then pointed Dean into the kitchen.
"Cas!"