A/N: Sorry it's late. I've been playing with the idea of Cas meeting Mary and John for ages, and this episode always seemed like a missed opportunity. Thankfully this story gives me the chance to play with that idea. How John and Mary react to Cas. And why Mary's so sure Angels are watching over her boys.

Chapter Title: Taken from the Song of the same name by Ozzy Osborne

Episode Dialogue: Song Remains the Same - Written by

CHAPTER THIRTEEN

Mamma I'm Coming Home

Sam glanced into the backseat of the 'borrowed' car to see the pair sat silently. Cas slumped in the corner, pale as death. His gaze flickered to his brother who sat beside his husband with a terrified look on his face. "Is he okay?" Sam looked back to the road in front of him.

"Do I look like Dr Angel Medicine Woman?" Dean snapped.

"I'm fine." Cas grumbled, his eyes still closed, breathing heavily in the silence of the car.

"He's tough." Dean nodded; his eyes fixed on the angel. "For a nerdy dude with wings." he grinned reassuringly, his hands squeezing the back of Cas's neck lightly.

"Well…" Sam turned his full attention to the road. Unable to watch his brother fret over his lover. "…hopefully if he landed like this, so did Anna. - Should buy us some time."

The car turned into the Robin Tree and Sam pulled up directly across from 485. Sam's eyes instantly sort out the house as he was pushing open the door before the engine had even stopped. Leaping out to rush towards his parent's home. He heard the sound of feet behind him but didn't think of stopping till Dean yanked on his arm.

"Dean, Anna could be here any second." Sam insisted.

"What are you gonna march up and tell them?"

"Uh...the truth."

"That would be unwise Sam." Cas said brokenly from behind Dean. Causing the hunter to turn. His hand snapping out to grab Cas's shoulder.

Dean looked back at his brother.

"Then I'll tell her demons are after them. She thinks you're a hunter."

"Yeah. A hunter who disappeared right when her dad died. She's gonna love me." Dean scoffed. He looked from his brother to the house with a wary sigh. "Just follow my lead."

Sam nodded, taking a step to the side to allow Dean to walk ahead with Cas at his side.

On the porch Cas slumped against the wall while Dean knocked; Sam stepping up beside him. After a few minutes the door opened to reveal a young Mary Winchester, a look of surprise, horror and fear on her face.

"Hi Mary." Dean said with a warm friendly smile.

Mary looked between the two men. "You can't be here."

"I'm sorry if this is a bad time…."

"You don't understand. I'm not…." she pulled the door closer to her body, glancing over her shoulder for a split second. "I don't do that anymore. I have a normal life now. You have to go." she moved to close the door, but Dean pressed his palm to the glass.

"I'm sorry, but this is important. Okay?"

A sound behind Mary drew the brother's attention as their father stepped up to the door.

"Sorry sweetie. They're just…."

"Mary's cousins." Dean quickly inserted. "We couldn't stop through town without saying hey, now could we?"

John smiled welcomingly at the pair, his eyes flickering to Cas leaning against the wall of the house. "Is he alright?"

Dean's head snapped around to stare at Cas with concern before forcing a smile and nodding. "Travel sick. - Oh, I'm Dean." he said quickly to change the subject. Holding out his hand to his father.

"You look familiar?" John frowned, staring at Dean intensely.

"Really? Yeah. You do too actually. Must have met some time. Small town, right? Gotta love them."

"I'm John." he shook Dean's hand.

"This is Sam…." Dean added, nodding to his brother. "And this is Cas."

"Sam? Uh, Mary's father was a Sam."

"It's a family name." Cas said from the sidelines. His head hanging as he inhaled deeply.

"You okay, pal?" John asked frowning at Cas.

"Just a long trip." Dean quickly replied.

"Well, Sam, Dean and Cas were just on their way out…."

"What? They just got here." John said, looking from his wife to the boys. "And Cas looks like he could use the break. - My mom's the same, can't travel fifty miles without needing to pu…."

"John."

"Sorry." he grinned sheepishly. "Come on in guys. Real happy to meet folks from Mary's side. Want a beer?"

"You twisted my arm." Dean grinned, reaching out to grab Cas's arm and drag him cautiously into the house.

They settled down on the couch. Cas slumped between Dean and Sam, a glass of water hanging from his fingers. His eyes closed as he inhaled deeply though his nose and fought back another wave of nausea.

"You sure he's okay?"

Dean's hand fell on Cas's knee out of habit, giving it a gentle squeeze. "He's fine." he nodded.

John looked between them for a few seconds. His eyes calculating and uncertain.

"You're so beautiful." Sam suddenly announced.

Dean's head snapped around to stare at his brother, partly grateful for the distraction from their dad's searching observation. He could see the pieces working to slot into place and couldn't fight the fear that was building inside him. He'd tried never to think of what his dad would make of his choices. Of whether he'd be ashamed. It was easier that way. Forcing a smile he grabbed onto the life-line Sam had thrown him.

"He means that in a non-weird, wholesome, family kind of a way."

"Yeah, right." Sam insisted, his face a perfect picture of horror and shock.

"We haven't seen Mary in quite some time…" Dean went on quickly. "...and see, she's the spitting image of our mom. - I mean. It's…."

"Eerie." Sam nodded.

"So how are you guys related?" John asked, leaning forward in his seat.

"Distantly." Dean answered.

"So you knew Mary's parents?"

"Yeah. Yeah." Dean nodded. "Mary's dad was pretty much like a grandpa to us."

"It's tragic." John murmured sadly, looking at Mary. "That heart attack."

Dean stared at Mary. The memory of that night flooding back to him. His inability to stop the yellow eyed demon. Watching the son of a bitch drive a knife into Samuel's gut before he broke his grandmother's neck. The worst part was watching Mary make the deal what would cost them all everything. "Yes. It was." he said finally, his gaze burning into Mary. He jerked at the touch of a hand on his arm. Looking down to see Cas's hand giving it a gently squeeze, offering him comfort and support. Just as he had that night. He met the angel's gaze softly, a small smile on his face.

"So, uh…" John coughed uncomfortably. "What are you guys doing in town anyway?"

"Work." Dean said quickly. Snapping his arm out from under Cas's grip like he'd been burnt.

"What line of work?"

"Pluming." Sam said at the same instant Dean answered. "Scrap metal."

"Oh gosh." Mary said suddenly, leaping to her feet. "It's almost 7. I hate to be rude, but I gotta get dinner ready."

"Maybe they could stay." John said quickly.

"I'm sure they have to leave." Mary glared at Dean instantly.

The phone ringing pulled all their attention. John slowly getting to his feet. "Uh, look, please stay. You know, it'd mean a lot to me. I haven't met much of Mary's side of the family."

"Thank you." Dean nodded, smiling warmly.

The moment John was out of the room, Dean and Sam were on their feet as Mary demanded that they leave. "Okay, just listen…."

"No. You listen. Last time I saw you, a demon killed my parents." Mary snapped. "Now you waltz in here like you're family? Whatever you want, no. Leave me alone."

"You and John are in danger." Sam snapped back.

"What are you talking about?" Mary frowned, looking between the pair.

"Something's coming for you." Dean sighed.

"Demon?"

"Not exactly."

"What, then?"

"It's kind of hard to explain, okay?" Dean said cautiously.

"An angel." Cas suddenly announced getting to his feet and stepping up to Dean's side. Swaying slightly.

Mary looked at him like he was crazy. "There's no such thing."

Dean looked down at Cas. "Believe it or not, there are."

"And why would an angel wanna kill us?" Mary murmured, looking between them.

"Long sto…."

"You're children are destiny to start the apocalypse." Cas stated matter-of-factly.

Mary's eyes widened with fear. "What?"

"Also, you know, stop it." Dean insisted, glaring at Cas. "Like I said, it's a long story. - We'll tell you everything but right now, you've gotta trust us and we gotta go." Dean said firmly.

Mary looked at him doubtfully, tears pooling in her eyes, shaking her head.

"Look at my face and tell me if I'm lying to you." Dean said softly, meeting his mom's blue eyes. His own filling with tears.

Mary inhaled slowly. "Okay. Where do we go?"

"Out of here. We gotta move now."

"Okay, but what do I tell John?"

"Just tell him…."

"He's gone." Cas said with a huff.

Dean, Sam and Mary's heads snapped around. "What?"

"Where?" Dean insisted.

"I don't know."

"Why didn't you stop him?" Sam asked angrily.

Cas turned to glare dangerously up at his brother-in-law. His eyes showing none of the weakness the sluggishness of his body was.

"Right. Sorry. - Well we need to find him." Sam said.

Mary rushed into the kitchen, the three men at her heels. On the pad by the phone, a message from John saying he was popping out.

"Where would he have gone?" Dean asked with panic.

Mary lifted the phone received and hit a few numbers. Listening before hang up. "It was the garage." she frowned. "He'll be safe at the garage."

Dean and Sam shared a concerned look. "We…should go pick him up. We can head out of town straight away."

~Beware Promises of Always~

"Anna." Cas grumbled from the backseat.

Dean's head snapped around from the driver's seat. "What?"

"She's here."

"Son of a bitch." Dean snapped, throwing open the car door and leaping out. Sam and Mary right behind him. "You stay in the car. You're too weak to go up against her right now." Cas opened his mouth to argue. "I said stay." Dean snapped, pointing at him with a determined finger, before slamming the car door and rushing toward the darkened garage.

The sound of fighting was echoing off the walls as they snuck into the building. Mary moved, wanting to protect her husband but Dean held her back by the arm. "Wait. - Sammy." he nodded to the wall.

Sam gave a brief nod, tugged his knife out of his jacket and rushed off. Dean watched as Anna swayed on her feet, glad to see Sam had been right about her being as weak as Cas. It gave them the advantage. Pulling Cas's angel blade from his jacket he looked down at Mary. "Stay here." then rushed into the fray as John went flying across the room. Refusing to think of the awkward way in which he'd landed. He was just within striking distance when Anna turned, grabbing his arm in one hand and his throat in another. Squeezing tight.

"I wish I could say it's good to see you." Dean wheezed.

"You too, Dean." the angel replied coldly. A split second later Dean was flying though the air, crashing through a window and landing painfully on hard concrete.

~Beware Promises of Always~

Cas remained in the car for the whole of ten seconds before he was appearing in the garage crouched beside John Winchester. He'd felt the snap of the man's neck instant. He pressed his fingers to John's head, focusing all his power. When John sucked in a sharp breath and looked up at him, he dropped back onto his ass. His eyes searching out Dean as he attacked Anna. He watched in horror as Dean was thrown, almost in slow motion, through a window. Staggering to his feet he looked around for Sam, who was at the far end of the garage painting angel banishing sigils on the walls in blood. He looked down at John again. "Stay here." he ordered before he was gone. Reappearing unsteadily next to Dean. His hand on the hunters head.

Dean opened his eyes to look up at Cas. "I told you to stay in the car."

"Anna killed your father…."

"What?"

"I healed him." Cas clarified before swaying and landing back against the wall. The sounds of shouting and metal hitting metal ringing from inside the building.

Dean got to his knees and crawled over to Cas, his hand on the man's jaw. "You alright?"

"Go help your mother. Sam isn't finished yet." Cas insisted weakly.

Dean looked torn but with a shove to his shoulder he was on his feet and rushing back to the building. He reached the door just in time to see Mary thrusting a crowbar into Anna's chest. His eyes flickered to the end of the garage and sighed with relief as Sam finished the last of the sigils.

"Sorry, it's not that easy to kill an angel." Anna said almost regretfully.

"No." Sam called. "But you can distract them." he slammed his hand into the wall and white light filled the room.

Dean covered his eyes. When it faded he looked from Sam to Mary and nodded, before rushing back to Cas, who was still slumped back against the wall.

Slipping his arm around Cas's waist he helped him to his feet and part carried, part dragged him towards the cars. He turned at the sound of voices to see Mary rushing after John, looking panicked while Sam walked slowly behind the pair.

"John, I can explain."

"I don't want to…." he shook his head, heading for the Impala.

"We need to get out of here. Somewhere save." Dean said firmly, resting Cas against the side of the car. "That means all of us." he added, blocking John's way.

"I don't…."

"I know a place." Mary nodded. "About twenty miles outside town."

Dean nodded. "Sammy, get the bag." he turned, grabbed Cas's lapels and yanked him towards the back of the Impala, pulling open the door and gently easing him inside, before sliding in next to him. Ignore all attempts at protest from his father. Sam climbed in on the other side of Cas a few moments later. Then Mary and John were in the front seats and they were pulling away from the garage. Mary giving John the directions to the safe house.

It was another ten minutes before the shock finally seemed to set in and the questions started. "Alright start talking." John demanded.

Dean looked at Sam. "Huh…."

"Not you." John snapped. "Mary?"

"It's a long story." she said on an exhale. "I…hunt things."

"Things?"

"Monsters."

John stared out of the windscreen, his fingers white knuckling the steering wheel. The silence in the car suffocating.

"Monsters. - Monsters?"

"Yes." Mary sighed.

"Monsters are real."

"I'm sorry, I didn't know how to…."

"And you fight them? All of you?" he glanced into the back seat accusingly. "And what's he?"

"Angel." Cas replied weakly.

"Angel?" John looked into the backseat. "Angel's are real?"

"Yeah." Sam nodded.

John shook his head. "How long?"

"For eter..." Cas began to reply.

"He's talking to mo...Mary." Dean whispered.

"Oh." Cas nodded.

"All my life." Mary murmured quietly. "John…." she sighed. "…just try to understand…."

"She didn't have a choice…." Dean tried to defend.

"Yeah she…." Sam added.

"It was desti…." Cas said weakly.

"Shut up all of you!" John snapped. "Look, not another word or so help me; I will turn this car around!"

Dean glanced over at Sam, a smile fighting at the corners of his lips. "Wow, awkward family road trip."

"No kidding." Sam snorted.

Dean turned his full attention to Cas, whose head had lulled to rest on his shoulder. "You okay?"

"I'm fine Dean. I'm just a little drained."

Dean's fingers instinctively reached for Cas's hand. Gripping it tight. He turned his head slightly and pressed his lips unthinkingly to Cas's temple. Sam's cough beside them had Dean's head snapping up. Sam nodded subtly at the front. Glancing Dean met his father's eyes in the rear view mirror. A look of understand and what Dean took to be disgust on his face. Tearing his eyes away from them, he dropped them to his lap. He didn't move to let go of Cas's hand though. There was no point. His father knew now.

A/N: Sorry its so short.