This chapter is rated M for interspecies sexual content.

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The feathers were soft under his fingers, as usual, and the angel gasped softly when Dean moved his hands through them, slowly, to feel them. He had touched them before, but that was only when helping the angel with an injured wing.

Now, it was different. His relationship with Cas was different. Everything was different.

Dean started putting the feathers into their right place to make them look nice again. They were mostly dry, and Dean stared at them in awe as they looked so shiny white beneath his fingers. The wings and feathers were beyond beautiful – and most importantly; they were a part of Castiel. A very intimate part and he was touching them.

He hadn't thought grooming those wings could bring this much excitement, but it did. This moment was very special – to both of them.

Castiel sat quietly as Dean studied the feathers and groomed them. His shoulders were more relaxed now, but still tense, and his breaths were deep and uncontrolled.

"Which parts should I avoid?" Dean asked, suddenly remembering what he had been told earlier.

Castiel seemed to be drawn out of his thoughts. "Um, avoid the oil glands. They're at the very base of my wings, right where they meet my skin. My clothing should cover most of them but please, avoid touching me there, they're very… sensitive."

"Okay, I won't touch them, Cas," Dean said. Castiel nodded, thankfully. Dean looked down to see if he could spot them. He noticed something at the very base of the wings, like Cas had said, but most was covered by the shirt. He didn't know anything about grooming and had basically no idea what oil glands were for, except to coat the feathers in oil to make them look prettier. But they seemed to be private and sensitive since Cas didn't want him to touch them.

Dean shrugged it off and focused on grooming the wings again.

/

Castiel sat tense as Dean started to move his hands through his wings. He knew that Gabriel had been right – it was Dean's responsibility to groom him now, and not his brother's. When angels found a potential mate and the two of them got very close – almost mated – this potential mate would be the one doing the grooming. It would become inappropriate if a family member continued doing it. But only a bonded mate was allowed to make use of the oil glands and to touch them.

Dean's hands were warm and gentle on his wings, and Castiel relaxed into his touch after a while. He knew Dean wouldn't try to hurt him. He gasped when the human's hand hit some of the most sensitive places on his wings. Small, helpless gasps escaped his mouth and he couldn't help it. He bit his lip, feeling embarrassed.

Being groomed had never felt like this before and it kind of scared him. The feel of Dean's hands through his wings was nothing like Gabriel's.

Castiel felt a rush of something go through his body. It warmed him from top to toe and settled in his abdomen. He shifted, uncomfortably, as his body seemed to react to Dean's closeness and his hands in his wings.

He gasped at the sweet feeling in his body.

Then suddenly he understood what going on.

He was starting to get aroused.

Dean was making him feel aroused.

Castiel groaned and closed his eyes as Dean's hand caressed the sensitive wing bone. The feeling sent small waves of arousal through him and he let out a moan.

Castiel had been aroused before. His body had responded to the stimulation his old owner had given him when he had sex with him, but it was not the same. He had only been aroused with his body back then – never his mind.

Now, he felt the arousal in both his mind and body, and he shivered as the sweet feeling overwhelmed him from the inside out. It was a strange, unfamiliar feeling and it was hard to control.

He had felt a sexual attraction to Dean for a while now – ever since he had admitted his feelings, and it had grown stronger since. But he had never wanted to have sex with him before; he hadn't been ready. But the shifter had stirred something inside of him when she had touched Dean; awakening sudden possessive feelings inside of Castiel that were hard to control. He had wanted to yank the shifter off of Dean and claim the human for himself, but the spell had held him back, and so had his hesitance.

But as the arousal spread through his body and Grace, Castiel knew he was ready. He wanted Dean so bad it almost hurt.

/

Dean felt the angel shift and tense all of sudden. "Cas, you okay?" he asked, worried.

Castiel's eyes snapped open. He didn't know what to do. Dean's touch was making him aroused and it scared him. He had never felt this way before.

"Cas?" Dean prompted, worried. He shifted behind him, and leaned forward to see what was wrong with the angel when his gaze suddenly landed on the obvious bulge in the angel's pants.

"Oh," Dean said. That was not what he had expected to see and he was taken by surprise. Castiel whimpered; his wings leaning back against Dean's touch.

"Cas, are you sure this is a good idea…?"

Castiel groaned. "Please, Dean, don't stop."

"Cas…"

The angel's soft growl made Dean leave it be, and he slowly stroked across the feathers once more. Castiel shuddered beneath his touch; neck arching.

Shit, that was hot, Dean thought. Cas was getting aroused because of the grooming. Because of him.

Dean slowly moved a hand away from the right wing, earning a displeased grunt from Castiel, before he moved his hand around to the angel's belly. The angel tensed up at first, but soon allowed Dean to move his hand under the shirt, stroking across his soft belly and up to his chest.

Castiel gasped and leaned back into Dean, who moved to kiss his neck. Castiel bared his throat to him and Dean nipped at it gently, causing the angel to shudder.

"Dean, Dean," Castiel gasped.

"Cas, I'm not sure about this. Maybe this is going too fast, maybe—"

Castiel grabbed the hand that was on his stomach. "Dean, I want this, please… I want to feel you against me; to feel your touch. Please, Dean."

"Cas, isn't this going a little too fast? I mean, you haven't wanted it before," Dean pointed out.

"I have wanted it before, I just… I wasn't ready," Castiel said, shifting impatiently while he leaned back against Dean. "When your hands touched my wings, I… I haven't like that before. It made me want; it made my entire being want. Please, Dean..."

"Okay," Dean said, gasping softly. He looked around the room. "Maybe we should move somewhere else? In case Gabriel busts back in?"

Castiel looked up and his eyes went across the room. "We can go to my bedroom," he said.

Dean froze. "You sure? I haven't been in there before." He had always slept on the couch when he was sleeping over, 'cause he knew the angel was uncomfortable with the thought of sleeping next to him.

Castiel slipped away from Dean's arms and stood up, pulling Dean to his feet before he placed a kiss on the human's lips. Dean kissed him back, and when they pulled back from the kiss, Castiel stared at him with determined blue eyes.

"I'm sure, Dean," he said.

Dean nodded, and the angel smiled and led him to the bedroom. It was smaller than Dean's bedroom but the bed was a lot bigger – it had to accommodate two large wings, after all.

As soon as they stepped into the bedroom and closed the door, Castiel kissed him again, eagerly.

Dean growled and kissed him back, taking control of the kiss and feeling the angel submit to it. They hardly noticed that they were walking towards the bed. When the back of Castiel's knees hit the bed, he yelped in surprise and dragged Dean down on the bed with him. Dean landed on top of him, and the angel groaned at the extra weight. Dean just chuckled and moved to plant small kisses on the angel's neck.

Castiel moaned and arched his back; his wings spreading across the bed until they covered the entire surface.

Dean was careful not to crush the wings, and he held himself up on his elbows, which were placed at the angel's sides.

He continued to kiss and suck on the angel's neck, making Castiel writhe and gasp beneath him. When he reached his collar bone, Castiel bucked against him; making their groins touch and Dean gasped and pulled back.

Castiel stared back at him in bewilderment. Not because he was surprised by the gasp, but because of how the gasp sounded. Castiel blinked at him before his gaze fell to Dean's groin. He reached up a hand, slowly, and brushed it over Dean's erection; earning another beautiful gasp from his human.

"Fuck," Dean cursed, leaning into the touch against his will. Castiel stared back at him, wide-eyed. "Cas, you don't have to…"

Castiel ignored him and rubbed his hand over him more insistently. Dean moaned, and lowered himself down to catch the angel's lips with his own. Castiel returned the kiss, and his hand moved up to Dean's waistband, trying to get inside, until Dean stopped him.

"Whoa, easy," Dean chuckled. Castiel stared up at him with a confused frown. "Tonight is about you, so let's take it slow, okay?"

Castiel brow furrowed more. That was not what he was used to; usually it was him who was expected to do something for other, not the other way around.

Dean could see what he was thinking, and he sighed and kissed him again. His hands moved over the angel's clothed chest, caressing him, and Castiel moaned softly. Then he leaned up, hands still on the angel's chest, and pressed a soft kiss to the left wing.

Castiel gasped loudly, bucking against him again, as Dean continued to kiss and nip at the wing bone.

"Dean," Castiel gasped, overwhelmed by the sudden pleasure going through his body as Dean's mouth was doing things to his sensitive wing. "Dean, please."

Then Dean moved his hand under the wing down to where the scar was and caressed the place tenderly.

Castiel froze. The scar something from his old life, a reminder of his old owner, and Dean was touching it. A warm feeling spread through him and he whimpered. Dean was touching that place. He wasn't disgusted with him; he was accepting him and everything about him.

"Dean," Castiel gasped, in awe. He bucked and cried out in pleasure as Dean's mouth nipped at a particularly sensitive spot on his wing.

Dean chucked and pulled back to kiss Cas' lips again. His hands moved lower, stopping at Castiel's waistband, and he pulled away from the kiss to look in his eyes.

"Do you trust me, Cas?" Dean asked him, looking into his eyes without blinking.

Castiel's eyes were nervous but he nodded nonetheless, and Dean slowly pulled down his sweatpants and underwear. He didn't take off the angel's shirt, because he didn't want him to feel too naked. The angel tensed and Dean leaned back to look at him, taking in the beautiful body beneath him, before he finally leaned forward and licked the underside of the exposed cock.

Castiel gasped in surprise. "Dean!" His hand moved to grasp Dean's short hair. Cas had not expected him to do that, and Dean could sense that this was the first time someone had done this to him before. So he did his best; licking the cock before taking it into his mouth as far as it would go.

Castiel almost went mad above him; writhing, thrashing and gasping.

The weight and taste of Cas was sweet in Dean's mouth, like everything he had imagined, and he found himself humming as he continued to bob his head over the angel's dick.

Dean moved his hand down to cup the angel's balls; rolling them in his hands while he sucked him. Castiel cried out and Dean had to hold him down by his hip so he wouldn't buck into his mouth too hard and make him gag. He swirled his tongue around the head, teasing, and took the rest into his mouth again.

He was surprised when Castiel suddenly pushed him back when the angel was so close to coming. Castiel pulled him up and crashed their lips together, and Dean kissed him back in surprise.

When they pulled back, Dean stared at him in confusion. "Cas?"

"I didn't want it to end so soon," Castiel explained.

"Cas, it wouldn't have ended. We have all night," Dean pointed out, feeling a little disappointed about not getting to taste all of him.

"No, I mean… I want you to be inside me, now," Castiel said.

Dean stared at him in bewilderment. "Cas…"

They had only just started this, and them going that far so soon… it wasn't right. He knew what Cas had gone through before, and he wasn't sure he could do this yet. "Cas, we don't have to do that yet, it can wait. There are many other things we could do—"

"Please," Castiel insisted. "I want to feel you inside of me; I want you to erase every bad memory I have, I want you to replace all of it with yourself. Please, Dean."

Den hesitated, unsure of what to do. But Castiel's eyes told him that the angel was sure of this, that he wanted this, and so Dean gave in and leaned down to claim his lips again. Castiel mewled into his mouth Dean looked around before pulling away.

"You don't have lube, do you?" he asked.

"Lube? I don't… use it. I don't do such things with myself," Castiel admitted, looking away.

"Oh," Dean said. He wasn't really surprised. "Well, guess spit will have to do, if that's okay."

Castiel glanced at him, and Dean moved his fingers up to the angel's lips. He eyed the fingers curiously, before taking them into his mouth.

Dean groaned. This shouldn't be as hot as it was, seeing Cas' lips stretched around his fingers while he prepared them for Dean. He groaned as he felt his hard dick twitch impatiently in his pants.

When his fingers were wet enough, he pulled them from Castiel's mouth. They hadn't looked away from each other's eyes the whole time, and Dean knew that eye contact would be important while they did this. He moved his other hand down; tucking at the angel's pants and underwear, slowly pulling them off of him with Castiel's help.

Then he leaned down, placed a kiss to Castiel's lips who kissed him back, before he moved his slicked fingers over the angel's entrance.

Castiel gasped when he felt the fingers and tensed up immediately.

"Shh, it's okay, Cas. It's just me," Dean soothed, still looking into his eyes. Castiel stared back at him, nervously, before forcing himself to relax. Dean's finger slipped in easily after that and the angel hissed softly. But Dean was slow, keeping eye contact, and didn't do any sudden movements.

One finger became two, and two became three, and Castiel took them easily; eyes never leaving Dean's. He did, however, tense every time a new finger was added but he quickly adjusted to it.

When Dean had stretched him good, Castiel started pushing back against his fingers, and wriggled his hips impatiently.

"Dean, I'm ready, stop teasing," he growled.

"You sure?" Dean asked.

"Yes, Dean. Now, please," Castiel said, growling impatiently, "I want you, now." His fingers dug into Dean's side where he was holding on to him, and Dean knew that was going to leave bruises later.

Dean pulled his fingers out, slowly, and started fumbling with his own pants. He pushed them off and his underwear and shirt along with them and threw them on the floor.

Castiel glanced down over his now naked body, taking in the toned chest and muscle. He seemed unable to take his eyes away from the human's body. Dean was beautiful. He was so much different from Mr. Hammond, and Castiel felt himself aching to touch this beautiful body.

Castiel reached out a hand, moving it down Dean's chest; feeling the muscle twitch under his touch and took in the soft sound Dean made as he touched him. His hand stopped over the hard, leaking cock, hesitating, before moving it back up Dean's belly and chest.

Dean smiled at him, leaning down to kiss him again, and then he positioned himself at Cas' entrance.

Castiel tensed slightly when Dean's cock pressed at his hole, but Dean's constant eye contact relaxed him. He made his body relax so that Dean could push into him, which he did; groaning as he slipped into the angel inch by inch, going torturously slow.

Castiel's grip tightened on Dean's arm and side, feeling him slip into him slowly until he was fully sheathed inside of him.

Both gasped and Castiel threw his head back on the bed, moaning.

Castiel was all tight and hot around him, and Dean waited for him to get used to the feeling of him inside. The angel glanced up at him in confusion. "Dean, why aren't you moving?" he asked, impatiently.

"I'm waiting for you to relax, dumbass," Dean said, fondly, and chuckled at him.

Castiel looked surprised at that. No one ever waited for him to relax before moving, so he was taken a little aback by that.

When he felt the angel's walls relax around him, Dean pulled back to the tip before pushing back in, causing Cas to gasp and jerk beneath him.

"Fuck, Cas, you're so tight," Dean gasped, overwhelmed by the feeling of his angel all around him. Castiel whimpered softly and urged him to move more.

He set a gentle pace at first, not wanting to be too rough with him. The angel closed his eyes briefly, letting the feeling of Dean thrusting into him overwhelm him. Dean adjusted his hips, looking for that special spot inside. He knew when he'd found it because Cas' eyes widened and he cried out in pleasure and surprise.

"Dean!" Castiel gasped, bucking against him, and Dean smiled, leaning down to kiss the angel's neck. He moved one of his hands which he had been steadying himself with, and moved it into the angel's wings.

Castiel screamed out pleasure when Dean found his wing and buried his hand in it; grasping the feathers gently and stroking through them. The angel's inner walls clamped down around Dean every time he thrust into him, making him groan and gasp.

"Shit, Cas, I can't… I won't last long," Dean groaned, feeling his climax pool in his abdomen already.

"Nuurgh, faster, Dean," Castiel growled; hands pushing at Dean's ass. Dean complied and thrust faster, harder; hand buried in the soft feathers as he lost himself in the angel under him.

Their eyes met, blue staring into the green as pleasure consumed them both. It wasn't just sex – it was making love, and Castiel giving himself to Dean in a way he had never given himself before.

It was about trust.

Castiel was overwhelmed by pleasure. In mind and body. A pleasure he had never known before, a pleasure that made him feel complete.

Castiel's body tensed up as his climax hit him – feeling unlike anything before – and he cried out Dean's name; his body tightening up as he came in long, hot spurts between them. The sight of his angel coming, and his walls tightening around him was enough for Dean to fall over the edge. He moaned out Cas' name and came, hard, inside of the angel, filling him up.

Castiel gasped at the feeling of Dean's warm seed filling him. He felt his Grace react to it; wrapping around it, binding itself to it and marking him as Dean's mate and Dean as his.

They collapsed back against the bed; Dean being careful not to crush him.

Castiel panted, trying to catch his breath, and he stared at the ceiling as he felt the bond between them close up and become complete. Dean must have felt something too, because he shifted against him, uneasily, and glanced at him with his bright green eyes.

"Cas? What was that?" he asked, sounding literary fucked-out.

"My Grace has bound itself to you. I'm your mate now," Castiel replied, still staring at the ceiling. Dean's head moved up from where it had been resting on his chest and stared at him. Castiel stared back, nervous about Dean's reaction; he feared the human would not take it very well being mated to him.

"Oh," Dean said, dumbly. "As in… mates for life?" He knew angels mated for life, but he still asked.

Castiel looked away, nodding.

Dean let the thought sink in, before he grinned, making the angel stare back at him in bewilderment.

"I kinda like that thought," Dean said, smiling. It meant that Cas would be his forever, and no one else's, and Dean was just fine with that.

Castiel blinked at him before smiling – one the brightest smiles Dean had seen on him. They kissed, and Castiel melted into it, humming contently at the feeling of his mate's lips against his.

Dean pulled back from the kiss; caressing Cas' cheek with his thumb. "I think I love you, Cas," he said, staring into the blue eyes that widened a little. "I think I have for a long time now. I haven't loved anyone before, not like this," he admitted.

"I love you too, Dean," Castiel replied, smiling.

Dean smiled back, kissing him again, possessively, and felt Cas mewl into his mouth.

They adjusted themselves; Dean rolling over on his back with Cas pressing up against him, head on Dean's chest and an arm over his waist. His left wing wrapped around them protectively while the right wing was draped over the bed behind them.

They fell asleep like that, feeling content in the other's warmth.

To be continued…

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This chapter was really hard to write. Writing smut is really difficult and embarrassing for me, lol. But I hoped you liked it!

And I got so many reviews on the last chapter! I was stunned and so happy – thank you guys! ^_^ because I got so many wonderful reviews, I decided to update this chapter earlier than planned :)

In the next chapter, Cas will be telling Dean a little more about his past, so look forward to that.

Thanks for reading and please let me know what you think :)