Dean turned off the shower as he got out and dried himself off. He wiped the steam off the mirror and looked at his reflection.

Has it already been a year?

Dean thinks back when he and his younger brother, Sam, started seeing things, people turning into monsters. That's when their father pulled them aside and said that they were Grimms, monster-hunters that can see "Wesen", creature that were animal type hybrids. He then started to teach them how to kill wesen, most of the methods by decapitation.

Sam stopped when he turned 18, finally disgusted with the life and leaving to go to college.

Dean didn't stop.

He adopted his father's views, that it was only black and white, that the wesens were monsters that needed to be exterminated.

But then he met Castiel.

He was in North Carolina, tracking a case with violent jaegerbar, when he met the nerdy librarian, Castiel Novak. They practically had an instant connection, it felt to Dean like he knew Castiel for years. Even after he killed the jaegerbar, he still stayed and saw Castiel again and again. Jus doing normal things with him, hanging out, going to lunch, calling him Cas. He never meant to fall for him though, never meant to fall so hard for him.

He thinks it was Castiel's blue eyes that did him in, those electric blue that seemed to stare into his soul. Those blue eyes that brightened when he asked Cas out and kissed thoroughly.

Two blissful months passed and one night, Dean became frisky and bit Castiel's neck while they were making out. That's when it happened.

He felt Castiel's skin ripple and it turned to soft fur. They both pulled away and saw Castiels feature were cat-like. His face had bluish fur with spots, making him look like a jaguar and his eyes were amber. Dean realized this was a balam.

Castiel is a balam.

Castiel is wesen.

A wesen!

Castiel shifted back and gasped as he backpedaled from Dean.

"You're a grimm?!"

"Yeah." Dean said slowly, still too shocked to raise his voice, "And you're wesen."

Castiel then narrowed his eyes and took a shuddering breath.

"Are you going to kill me?"

Dean didn't know what to say or do. The instincts that always went off in this situation were silent. Hes know he's supposed to kill Castiel because he's wesen, like his father taught him. But this wasn't a wesen, this was Castiel, this was Cas, this was his Cas!

"I-I-Fuck! I don't know!" Dean exclaimed as he suddenly turned around and ran to his car. He then drove off as fast as he can, away from everything.

He then pulled on the side of a long road, taking in deep breaths of air. He then felt misery descend on him like a blanket, not knowing what to do. He then decided to do the only thing that made sense.

He called Sam.

When Sam picked up, he just spilled everything. How he met Castiel, how he fell for him, that he doesn't want to kill him, how he loves him.

Sam was quiet for a while and then finally asked,

"Is he worth it?"

Dean was quiet for a bit as millions of thoughts ran through his mind. Of how he hasn't been this happy in years, how his days seem brighter from Castiel's smiles, how he laughs every time Castiels blush from his nickname.

Does it matter that he was wesen?

Strangely…no.

He remembered Sam laughing quietly and says , "You better not lose him then."

Dean goes back to town, but it takes him about a week to gain the courage to Castiels house. When he knocked on the door, Castiel answered, but when he saw it was Dean, he backed away, his eyes woge to amber.

"Cas…I…"Dean said, seeing Castiel still tense. Dean sighed, deciding that actions spoke louder than words.

He took put his hunting knife, showing it in full view of Castiel and then throwing it to the ground. He then looked back at the balam with pleading eyes.

"Never you, Cas, never you."

He saw Castiel stiffen and his eyes turned back to the blue that he loved so much. He then stuttered "Dean" and launched himself into his arms, kissing him with all the passion and love he could muster.

They made love that night on Castiels wooden floor.

The next few months were a blur; a lot were filled with rocky times. With his dads rather violent disownment, Sam's unexpected support, meeting Castiels family, nearly getting killed by Castiels family and then yelling at them he will never hurt Castiel, he loved him too damn much.

This brings him to the present, looking at his reflection. There was still one obstacle thay had to go through and that was Dean to fully accept Castiels wesen side.

Dean quickly dried himself and put on a pair of boxers. He headed to their shared bedroom, smiling when he saw Castiel propped up by pillows reading Doctor Sleep and when he saw Dean, he smiled brightly. Dean gave a small smile back and sat next to Castiel, then reached over and started to kiss him.

The kiss quickly intensified as they moaned and kissed. But Dean pulled away, making Castiel frown.

"Dean, wha-"

"Woge for me, Cas."

Castiel blinked.

"What?"

"Woge for me." Dean repeated, "I just…fuck, Cas, I love you so much. I just…I wanna accept everything you are. Man and beast, like you accepted me, man and grimm."

He never liked these chick-flick moment, but Castiel was looking at him all tear-eyed and nodding made it worth it. Castiel then tilted his head and woged, looking warily at Dean.

Dean stared at his lover, taking in the spotted pattern on the midnight blue fur. He then looked over the muzzle and the canines poking out. Finally, there were his amber eyes staring at him.

He reached over and stroked his cheek, making Castiel purr.

"You're beautiful, Cas." He whispered, making Castiel purr louder and nuzzle Dean.

The road ahead was gonna be rocky, but it was would be worth it.

It would totally be worth it.

AN: Here is my Grimm AU. Had so much fun with this.

This was supposed to be a simple one-shot, but instead it turned to a nearly four page monstrosity.

I just had to put Dean as a Grimm and Cas has a wesen, I decided a balam, but that is such a cool wesen and I think Cas would make an awesome jaguar-creature.

So, this is just a basic love story with a forbidden love twist, forgive me if it's too schmoopy.

Enjoy and comments are loved! I don't own SPN or Grimm!

Next up is Domestic AU.