A/N: well... this is my new story. It's a Cass/Dean double Mpreg story. I think I'll tell you how this came about. Me and my best friend, Tayla(Flossy2095), were texting back and forth for about 5 hours. And I was explaining what Mpreg was. She got it pretty quickly and I decided I was going to write a supernatural one with Dean and Cass. Then we started fighting about who would carry the baby, Cass or Dean. The Tay came up with the idea to have twins. One carried by Dean, One carried by Cass. She is brilliant! So this is collaboration between me and her.

Also this frist chapter is a Lemon. The 1st one I have ever written so go easy on me.

When Lightning Strikes Twice

Chapter 1.

Dean was sitting at the small table in their latest motel room and was tapping his fingers on it nervously.

'I'm sure he's fine, Dean.' Said Sam from his position opposite Dean, 'Cass is a big boy, he can handle himself'

'I know, but...' began Dean, still taping at the table.

'You're worried about your husband' Sam said as he continued to tap at the keys of his laptop. 'It's cute' he added with a smile. Dean kicked him under the table.

Moments later the two boys heard the familiar sound of fluttering wings, that announced the Angel (and Deans Husband), Castiel.

Dean and Cass had been married for six months and they knew each for about a year before hand.

Dean had never liked guys before Cass; his life had been hunting, picking up random girls in bars, and having meaningless sex.

But with Cass it was different, nothing was meaningless. From the moment Cass had pulled Dean from hell, they had bad been connected somehow, dean just couldn't explain it.

As soon as Cass had appeared in the room dean had stopped tapping, he didn't want to seem worried.

'You took your sweet ass time' Dean said, Sam just rolled his eyes and closed his laptop.

'O.k. so I'm going to leave you two alone' began Sam, 'If you need me I'll be a Phoebes'

Sam grabbed his laptop and headed for the door, but he paused with his hand on the door handle and looked back at his brother and Brother-in-law. 'And don't break the bed this time; we don't have the money to pay for it.' Sam walked out the door and off to his girlfriends, Phoebe Hartnett's, Place, leaving Cass and Dean Alone in the room.

Dean stood up and walked over to his Angle who was standing by the window.

'You OK? It took you awhile.' Dean asked his husband.

Cass had been looking into a series of strange deaths in Texas. He had suspected it might have been a rouge Angel.

'I'm fine Dean; the Angel has been, taken care of.' Cass' eyes were staring out the filthy motel window

Dean sighed and placed his hand on Cass' shoulder. Dean knew it couldn't have been easy for him to kill his fellow angel, it never was.

Dean moved his hand from Cass' Shoulder to his check and just stared into his husbands. Beautiful, blue eyes, before placing a tender kiss on the Angles lips.

Castiel wrapped his hands around Dean's hips and pulled him in close, closing the space between them. Dean took his hand from Cass' check so he could wrap both his hands around his Angels neck.

The kiss was passionate and hot: as it had always been between them.

Cass' leg was in between the hunters legs and as Cass shifter his position it rubbed agents Dean's Growing erection, causing him to moan into the Angels mouth. Cass retuned the moan.

Dean broke the kiss once he needed air and ran his fingers though his Angels hair. 'I love you' he said as he looked into Castiels eyes.

'I love you also, Dean' replied Cass as he lead dean over toward the bed.

Dean fell down on the bed and Cass climbed on top of him. He placed a soft kiss on Dean's lips, before sitting up and removing His trench coat, suit jacket, tie and shirt. While Cass was undressing, dean pulled his t-shirt up and over his head and the pair locked lips again. The kiss was different, more hungry, more needy, Dean needy to be inside Cass or have Cass inside him.

The kiss was broken as Cass purred in Dean's ear 'I want you.'

Dean Moaned out as Cass laid kisses from his neck to his waist and back up again.

Cass' hand moved to undo dean's pants, his other was placed on the bed to steady himself, All the while keeping his mouth on deans.

After a few moments of Cass trying to free dean from the restraints of his jeans, he gave up and just used his "angle mojo" to remove them. Dean was now lying naked under his husband.

Dean shuttered as the cold air hit his war flesh. Dean shifted his legs and realised Cass was still wearing his pants. 'Dude' kiss, 'Not' Kiss, 'Fair' Kiss 'De-' kiss 'Pants' kiss, 'Now'

Cass stoped kissing dean and locked eyes with him. A checky smile slipped on to the angels face, and a moment later, Cass' black pants were gone.

Cass bucked his hips causing his erection to rub up with Deans, resulting in both men moaning out in pleasure. Cass repeated this several more times.

Dean could feel a warmth building in his abdomen and knew if Cass didn't stop he was going to come undone in a matter of minutes.

'Babe, ahhhhh God! Get-get on with it, Uh' Dean managed to get out between moans.

Cass bucked his hips a few more times before he stopped. He placed a soft kiss on dean's lips before he leant over and grabbed the lube out of the draw.

Cass squirted the lube onto the fingers of his left hand. 'Dean...' but Cass didn't need to finish, Dean had spread his legs as wide as he could. Cass let out a low moan at the sight of his husband laid out before him.

The Angel pushed his finger into Dean Ass and began to move it around.

Dean healed his breath and clenched his fists in the sheets at the feeling of Cass's finger inside him. Cass added a second finger and Dean's breath became fast and rugged.

'Castiel, Ahh, I - I - I - I' Dean tried to say but as he spoke Cass' fingers Hit his sweet spot and the words got stuck in his throat.

'You what, Dean?' Cass' purred from his position between deans legs.

'I, Want, you, In-sahhh-side, me' Dean said between pants.

Cass removed his fingers and Dean whimpered at the loss. Cass put so lube on his hand and took hold of his throbbing member to slick it.

Cass placed a hungry kiss on Dean's lips and slowly pushed himself into Dean. Both men let out low moans as Cass pushed all the way into Dean and stayed there allowing dean to adjust himself.

'Move' Dean grunted after a few moments.

Cass began to move. Almost pulling out of dean before pushing back into him. At first the rhythm was slow; Dean bucked his hips to met Cass' thrusts. But as the pair reached their peeks the pace grew faster.

Cass hit Deans Sweet spot time after time as dean moaned and gowned under him. And soon dean released his load over his stomach.

Feeling Dean tighten around him sent Castiel over the edge and he let go inside of dean filling him up, before collapsing on top of his panting husband.

After a few moments Cass pulled out of Dean and sat on his knees at the end of the bed. He watched Dean as his husband's chest rows up and down.

'Dean.' Cass spoke for his position from at around Dean's ankles. Dean opened his eyes, looked at Cass and sighed.

'Switch?' he asked

'Switch' replied Cass

Sam stoped outside the motel room and listen for a moment. It was just after midnight, four hours since he left the love birds alone and went to Phoebes.

Once he had decided it was safe to enter, he walked through the door and sat his laptop on the table. He then looked toward his brother's bed.

Dean was lying on his back with his arm around his angels shoulder. Cass' head was resting on Dean's chest and his arm lying across his husband's stomach. Sam was grateful for the blanket covering them from the waist down.

Sam knew that Cass wasn't asleep he was pretending, angles don't sleep. Cass just loved to be near dean while he slept.

Sam Smiled at that, it was cute.

A/N: Also I should say that Phoebe Hartnett is Tayla's OC. She loves Sam.

But Review, let me know what you think.