Sounds like music (Cas X Oc)

The Find

     It was a cloudy Thursday afternoon at the local university, eerily quiet the four men walked across the grounds.

"Bobby are you sure she's even here" Dean grunted already exhausted.

"Yes idjit! I'm sure!" Bobby replied as they continued across the grounds.

After a while they came across a liberal arts building, the four piled inside. Upon the stage sat two figures one, a tall man plucking the strings of a cello, the other, a petite girl playing a violin along with the plucks. The two carried on a heavy hearted tune.

"That's her..." Bobby smiled

The taller cello man looked into the darkness, immediately seeing the group. His eyes flashed a deadly black as he grinned, he turned back to the girl.

"Aspyn, I think that's enough practice for today" He said calmly

The girl stopped playing and looked at him confused

"We've been playing for 30 minutes " Aspyn replied

"I've got some exams tomorrow, I need to go study" he urged
Aspyn sighed and nodded "alright, it is getting late" she noted packing up her instrument. As she left the stage the man turned to the four,

"The Winchester's? Bobby? And the baby in a trench coat?" He grinned. Dean went forward, his knife ready in hand.

"Great to see you again!" He laughed

"You sons of bitches just don't know when to quit do you" Dean growled

"Bobby, you're daughter here...she's quite a musician..but she doesn't like people..it took everything I had to get her to talk to me, but don't worry she'll be dead soon" the demon snickered

Dean lunged at the demon just as Aspyn came back in, "I forgot my pur-" her eyes widened as she saw the scene. The knife plunged into his chest, light pouring out as the demon screamed

"Ezra!!!" Aspyn shrieked

She pounced on Dean

"YOU MURDERED HIM YOU SON OF A BITCH!"

"Get her off me!" Dean yelled

Two sets of arms pulled Aspyn up and restrained her.

"Let me go!" She yelled

"You're friend here was a demon!" Dean testified "I didn't murder him, he was possessed, Ezra was long gone"

Aspyn looked at him, tears filling her eyes "...what....a demon?" Her voice went hoarse

"Why are you lying!" She stammered

"I'm not" Dean sighed

She looked up at her restrainers one a tall lumber jack type, the other a medium god like fellow.

"Just let me go.." Aspyn said looking down
The two obeyed and let her down, she sat just staring at the body

"He was my only friend..." She repeated to herself "I'm all alone..."

Bobby stepped forward "No you're not" he said looking down at her "I'm Bobby Singer"

Aspyn froze, she knew the name, the man who had left her mother pregnant 20 years ago. She looked at him "you're...my father?" She croaked out, Bobby nodded. Her calm turned to rage "you left us!" She yelled as she got up and pushed him.

"All alone!" She cried

Bobby and the other three just stood there speechless

"Just give me a second to explain" Bobby pleaded

The next words out of her mouth were stopped by a hand to her forehead, soon after everything turned dark.