"Damn it."

That was the first time Kurt heard Blaine curse. They were in Kurt's room, working on homework, Blaine sitting at Kurt's desk and Kurt lay on his stomach on his bed. He had been writing on the notebook in front of him when he heard Blaine, who had just spilled part of his coffee across his homework.

Normally, Kurt would have been most concerned about the coffee that was threatening to spill onto his bedroom floor, or the coffee that was already moving on his desk. But his only thought was on the curse word that had just come out of Blaine's mouth.

Which was why he was currently gaping at his boyfriend, unsure of what to say. His polite, charming, dapper Blaine Anderson had never cursed in front of him before. Blaine seemed to not realize what he had said until after he had cleaned up his mess, with the napkin he had luckily got with his coffee order, and had turned around to see Kurt looked at him, mouth slightly open. That was when he blushed.

"Kurt, I'm sorry...it just slipped," he offered with an embarrassed smile, at which Kurt shook his head.

"No need to apologize," he said softly.

"Shit!"

That was the second time Kurt heard Blaine curse. This time they were outside, tossing a Frisbee between each other. Kurt had flung the Frisbee towards Blaine and, because Blaine had been momentarily distracted by the buzzing of his cell phone, the Frisbee ended up smacking him in the side of the head.

Kurt didn't do anything for a moment, now caught up in the thought that Blaine had cursed in front of him, again. After a few moments he caught up to himself and shook his head, jogging over to Blaine.

"Are you okay, Blaine?" He asked, gently touching the side of Blaine's head , which he winced slightly at. He nodded slightly and smiled a little.

"Yeah Kurt, I'm fine...I know it was just an accident, I wasn't paying attention. I'm sorry for cussing again..."

"Oh no...it's okay, I mean...I've heard cursing while you're hurt can help the pain, so..." He shrugged and laughed quietly with Blaine joining in on the laugh, though still looking embarrassed.

"Oh, fuck it."

That was the third time Kurt heard Blaine curse. Blaine had been growing frustrated with the homework and studying he had to do, and obviously was ready to give it up.

Kurt was also ready to give up. He was ready to give up holding himself back from flinging himself at Blaine and begging him to curse more for him.

Blaine looked at him in surprise when Kurt had crawled over to lay next to him on the bed, blinking up at him with an innocent sort of want.

"I'm sorry," Blaine said softly, opening his mouth to say more, but Kurt cut him off but pressing his lips to Blaine's. Blaine let out a small hum of confusion, trying to pull back a little. But Kurt's hand was at the back of his neck, holding him close, not allowing him to pull away.

After a few moments, Kurt pulled away, licking his lips as he looked at him, the innocence gone from his eyes. Blaine shivered at that look.

"Stop apologizing for cursing, Blaine. If anything, do it more, please," Kurt murmured, kissing at Blaine's jaw with a soft sigh.

"Why?" Blaine questioned, shivering at his kisses as he hands ran along his sides.

"Because, it's so hot to hear you curse," Kurt explained with a small grin, kissing at his neck, starting to suck a mark into his boyfriend's skin. Blaine moaned quietly and raised his eyebrows, licking his lips.

"Well, I...fuck, Kurt," he moaned softly when Kurt nipped at the mark before licking over it.

"Mm...I love hearing my polite, sweet, dashing boyfriend say bad words," he said with a grin, running his hands over Blaine's torso, stopping on his stomach a moment before they ran down his thighs.

"Maybe I can incorporate them into my vocabulary a little more," Blaine said with his own grin. Because if it was going to get Kurt running his hands all over him like he was, well he'd make sure to throw them in a bit more.

"Good boy," Kurt said with a smirk, which made Blaine shiver before he pressed his lips to Kurt's with a moan, the two happy to make out and whisper quiet curses and praises.