A/N Warnings for rough sex ahead, mayhaps a hint of dub!con
"Cas, baby. I wish I could drag you to the bedroom and drag this out for hours, bringing you right to the edge over and over and over again." Dean breathed, stroking the Omega's dick firmly. "You would beg me to let you come, and I would tell you no, not yet. Just one more time." Cas whined, unable to stop himself from bucking up into Dean's hand. "But you've already been to good, baby. Waiting for me, for hours... Soon we'll do this right, and I'll have you beg and moan and plead, and God, Cas, it'll be so hot. But right now?" Dean ran his thumb over the slit of Cas's dick before resuming his long strokes. "Right now I want you to come. I want you to come right now." Cas let out a long, drawn out moan into Dean's neck, thrusting his hips desperately into Dean's fist.
"Ah, Dean, Dean-" With a final, small whimper, Cas came all over Dean's hand. Dean grasped the back of the Omega's head, holding him in place while his breathing calmed.
"Shh." he murmured. "You were such a good boy for me today, Cas. Such a good boy." Cam tiredly hummed his pleasure. "You tired, baby?" Cas nodded.
"Yes, sir." he whispered. nuzzling into the Alpha's neck, breathing in his comforting, masculine scent.
"Go on to bed, then. I'm gonna hop in the shower and I'll be there in a bit." Cas nodded blearily.
"Thank you, sir." he muttered. Dean helped the Omega stand, holding him steady as his legs protested being used after so long a time of inactivity. The older man helped Cas to the bed, tucking him in gently with a soft kiss pressed to his forehead. Dean sighed softly to himself as he shut the door gently behind him, towel in hand. He made his way to the bathroom and stripped quickly, his hand brushing against his own still-hard cock as he did so. Dean turned on the water and softly teased his fingers along his shaft while he waited for the shower to heat up, imagining that it was Cas's hands touching him instead of his own.
When the shower was heated, Dean got in, letting out a satisfied moan as the hot water ran down the length of his body, immediately working at loosening his tight muscles. For a moment he was able to ignore his throbbing erection and just focus on the water- just then his dick gave a throb and he poured a small amount of shampoo into his hand before wrapping it tightly around his cock.
"Cas," he murmured as he began stroking. "That's it, baby." In his mind's eye, Cas was with Dean in the shower, on his knees. He had the very tip on Dean's manhood in his mouth, suckling and lapping at it like it was candy. Then he slowly bobbed his head lower, taking in more and more of his Alpha's length, glancing up occasionally to see Dean's expression, giving the green-eyed man a perfect view of his baby blues. Cas slowly began to stroke himself and Dean let out a groan. As Cas picked up the pace, Dean found himself unable to hold back anymore and he fisted his hands into the Omega's hair, jamming his entire length down the small boy's throat, giving another groan when he choked slightly and tears gathered in his eyes. Then he felt Cas moan around him, and suddenly the tight throat around his dick opened up, and Cas looked up at him, silently begging for Dean to take him, to fuck his face. And who was Dean to deny such a nice request? He began thrusting in earnest, his mouth working of it's own accord, spewing all manner of dirty things and Cas just stared up at him, unblinking and totally loyal. With a final thrust and a low grunt, Dean came down's Cas's throat, pulling out just enough to paint his face with some of his come. "You're mine, Cas. Mine."
And then he opened his eyes. He was along in the shower. Luckily, the hot water was still streaming down his back- thank God for decent water heaters. Dean quickly cleaned up and washed his hair. He padded quietly into the bedroom and slipped into a pair of boxers before carefully getting into bed with Cas. He wanted more than anything to sidle to the other side of the bed and wrap the Omega in his arms, pull him close and keep him safe through the night- but that might wake the beautiful teen. So he didn't, and fell asleep not long afterwards.
When Dean woke up the next morning, for a while he just breathed. Deep inhale, slow exhale. Slowly he came to realize that the reason he was so interested in his breathing was that he could smell Cas- and he was close. As Dean continued to breath, he noticed that there was another reason he was so focused on his breathing- something was across his stomach, making it a bit harder than usual to breath at all, let alone breath deeply. When he finally opened his eyes, he was unsurprised to see that Cas was right next to him, his head on Dean's shoulder, an arm thrown over his waist. He smiled at the cuddly teen and shifted, suddenly realizing the burning urge within him to pee. He glanced over at his bedside clock- his alarm would be going off any minute now, and then Cas would wake up and Dean wouldn't have to feel guilty about his movements waking him. He could wait that long. Really.
Probably.
...
Hopefully.