Having a literal Angel do the Lord by one's side was pretty useful, especially since he could just smite demons with the touch of his hand.

Sure, Castiel could be a little bit of dick sometimes but Dean was growing used to it as they went along. He started seeing Cas as more than a friend, someone he could confide in and trust with his life, because Cas would rebel for Dean, for his humanity.

Currently, Dean was working a case that was eating away at him like crazy. He had gone over every single page in his father's journal five times but couldn't figure out what creature could possibly do what it had been doing to the small town he was in. Sam was at a loss as well until he finally found something in the Lore:

Nephilim, the child created out of a union between an Angel and a human.

Dean immediately called Cas, knowing his friend would want a say in this and together, the three of them set out to find the Nephilim. They split up, Cas and Dean going to investigate locations down south whilst Sam ventured up north.

"I can feel it, this... Abomination" Cas said as they drove towards an old farm house. "Alright, so how do we waste it?" Dean asked as they got to the house. He loaded his gun before looking at Castiel again. "The gun won't do much, only the Angel blade." Castiel gripped it tightly in his hand as they went inside the house.

Inside, the only thing they found was a lone infant, laying in a straw basket that was decked out with blankets and pillows to make a makeshift crib.

That baby was you, the Nephilim. Since you were so tiny and had no parents to guide you and control your powers, you had unintentionally been causing chaos.

Castiel hesitated for a moment when he saw you, he had obviously expected a grown Nephilim, but that didn't stop him from raising the Angel blade. He was a soldier of God, you were an Abomination spawned from a forbidden union. He had to destroy you.

Dean grabbed his wrist tightly, stopping him. "Are you insane?!" He asked, horrified. Dean was an efficient, shoot now ask questions later, type of hunter, but you were a baby. Nephilim or not. "This creature needs to be destroyed, it cannot be allowed to live." Cas said coldly, ripping his arm away.

"Hell no, we are not killing a baby! I can't believe the words coming out of my mouth right now!" He picked you up into his arms and cradled you close, shielding you from Castiel. "If you wanna kill it, you're gonna have to get through me first!"

"Dean. Give me the infant. Now" "No! Who cares if it was made from a forbidden union or some shit, our relationship is also a pretty fucked up union I dare say. We're taking the baby with us and we'll teach it how to control its powers, end of story." Dean said.

After a lot of arguing, Cas relented. The three of you were back in the car, you in a makeshift baby seat. Cas was very displeased, but he had a soft spot for Dean, so he went along with it.