Dean could barely keep the Impala on the road, he was laughing so hard. He'd thought taking the angel to a brothel to show him some basic human lust had been a good idea, but they'd made a less than smooth exit from the building. Dean's sides ached with laughter even more when he took another glance over at the passenger seat. Castiel had knitted his eyebrows together in a bemused look and he frowned at the road in front of them, clearly not understanding what Dean had found so funny.
"That was a horrible place." He announced. "In all of my observations and now this, I'm still not sure why humans enjoy this lust."
"I'm sorry," Dean chuckled. "Tell me again what she actually did?"
"She pushed me down into a chair and then smashed her mouth against mine," Castiel crinkled his nose in disgust. Dean roared with laughter again at the mental image, and Cas pulled his coat more tightly about him, looking vulnerable and a little bit surprised. "Is it always like that?"
Dean became a little more serious. "No," he said quietly, "it's not. When it's done properly, it's the most amazing feeling in the world."
"Then will you teach me how to do it properly?" Cas asked simply.
Dean nearly crashed the car. "I... don't really think I should." He said carefully, wondering how to explain. "That sort of thing is usually between lovers."
Castiel processed these words and filed them away for future reference, but was quite insistent. "You were happy to let me be lovers with a strange woman, but you won't teach me yourself? I thought you were my friend." He looked a little hurt.
"It's complicated, Cas." Dean sighed.
"I'd much rather you show me instead of a stranger who doesn't understand about me," Cas told him stubbornly. "If you won't teach me everything, at least help me understand that custom for mouth-touching you seemed to find so funny."
"Kissing." Dean told him. "It's called kissing, and it's a way of showing affection."
"Kissing," Castiel mused. "I want you to show me kissing." The tone of voice made it clear that the argument was over, and Dean sighed again. He could never say no to Cas.
"Alright, when we get back to the motel, I will, but remember this was your idea!" Dean drummed his fingers on the wheel in frustration. The brothel business had been funny at first but deep down he felt strange about Castiel and his innocence. Dean hated to think he was taking advantage of him, but if Dean knew anything about angels, it was that they could be stubborn as heck when they wanted something.
OOO
Castiel hovered awkwardly in the motel room looking lost, agitating Dean who was closing and firmly locking the door behind them. "At least take your coat off, dude," He said, forcibly helping Cas shrug out of it and throwing it over a chair.
Dean planted both hands squarely on Castiel's shoulders. "Right." He swallowed nervously. "Kissing." He wondered where to start. "There's different types of kisses. You might have seen this one from watching humans." He quickly leaned forward and pecked Castiel's smooth cheek. "That can be used as a greeting, and friends use it sometimes."
"Okay," Cas said, "but that's not what that woman did to me."
"She kissed your lips, right?"
"Yes."
Dean sighed. He knew what was coming. Slower this time, he leaned in again and pressed his lips to Castiel's, keeping his eyes open to see his reaction, then moved back again. Cas looked a little surprised. "Well that wasn't as unpleasant as when she did it. Do that one again."
Rather than beat about the bush, Dean did as he was told, and felt Castiel casually pucker his lips to meet Dean's this time, like he'd learned how to kiss back. Cas was right- it wasn't at all unpleasant, and Dean felt his eyes relaxing...
"Good." He blinked, patting Castiel's shoulders as if he were proud of his student. Cas looked devastatingly cute and innocent with his arms dangling by his sides, and something pulled in Dean's chest.
"That woman's was longer than that," he said cheekily. Dean wondered for a moment if Cas was doing this on purpose, then decided he didn't care. "Like this?"
Dean did let his eyes relax this time, as Cas was doing, then his arms a little as well, stepping closer so he was holding the sides of Castiel's arms instead of his shoulders, encouraging them up, so the men were holding each other's arms as their surprisingly soft lips met again and again, Cas tilting his head a little to try out different angles.
"Open your mouth a little bit," Dean breathed, sliding his tongue forward just a tad, letting Cas adjust to the new sensation. A part of him was scared that this was a little too forward, a little too much to take in, but Cas accepted it eagerly and they lightly touched tongues and tasted each other before a shiver of delight ran through Dean that he couldn't suppress.
"Are you alright?" Cas leaned back, looking concernedly at Dean. "Did I do it wrong?"
"No," Dean practically groaned, "No Cas, you did it perfectly," he smoothed his hands down the angel's arms, and almost with regret told him, "but those kisses are for lovers." He gently disentangled himself.
"I think I understand." Castiel replied, his features smooth and unreadable. "They felt different. Certainly much more pleasant than before, anyway."
Dean took a few deep breaths. "Well, now I've taught you," he said in a strained voice. He left Cas standing where he was and sat down on the end of the bed, pulling off his shoes and tucking them together neatly. He was surprised when Cas was kneeling down and placing a second pair beside them; his own.
"Dean?" Castiel asked, laying his hand on Dean's knee, his puppy-dog eyes full of hope and enthusiasm from his new-found knowledge. "I know these kisses are for lovers, but do you think we could practice?"
I'd practice kissing with Cas any time, Dean privately thought. I could never say no to that face. All he said though, unable to stop a grin stretching his features, was "Oh I think we can do that."
This is my first shot at a Dean/Castiel fic, so leave me a comment if you liked it; I may be tempted to extend it and write more about what Dean can teach Cas!