Title: Where the Lines Overlap
Author: Claddagh Ring

Disclaimer: I do not own Glee.

AN: written for Ashley, basically for putting up with me most of the time; and because she wanted Blainchel (preferably 'cest) in Cooper's bed.

BLAINCHELCEST - or for the uninitiated, Blaine and Rachel as siblings in a romantic relationship.

Cooper would probably kill him once he came home, but that wasn't enough to deter Blaine. Not this time. This was one time too many his older brother managed to snag the spotlight over him. Everything he'd planned for - no, had worked for - ruined, just because after six years of living at home after his high school graduation, Cooper decided now was the appropriate time to make his triumphant stride towards Los Angeles and instant fame. Nevermind that he had no car, no apartment, no money; no, he'd just use mom and dad's. And if that meant putting the nix on Blaine's summer trip to Paris - the one he had slaved away over earning the money and maintaining his grades per his parents' requirements - well, then so be it. Cooper didn't care, so why should he, Blaine fumed as he tore yet another poster off Cooper's wall.

"Blaine? What are you doing in Cooper's room?"

And then there was Rachel, his baby sister by a whole three minutes, who had her own exciting trip to New York still intact. She had been invited to attend a series of workshops run by some prestigious acting school in preparation for her college applications next year and unlike Blaine's derailed plans, hers would stay the same. He didn't blame her the same way he did Cooper, but the fact remained that she had something he didn't and once again, he was the odd one out amongst his golden siblings.

"He's going to LA," Blaine replied angrily as he kicked a few of Cooper's shoes under the bed. "He's moving there this summer and I can't go to Paris because it's too expensive now."

Rachel bit her lip, her eyes sad for him. "I'm sure that's not-."

"This is a big risk your brother is taking and he needs our support," Blaine interrupted, his voice high and mocking to sound like their mother's before he switched back to his normal timbre. "Last month he wanted to move to Seattle and before that, it was Chicago. He's not even serious about it Rach, not the way I am about Paris. I worked for this and it's all for nothing because precious Cooper comes up with another one of his crazy half-assed plans."

"Maybe if you show mom and dad how much money you've saved on your own, you can work something out with them," Rachel suggested and he knew she was just trying to help, but he couldnt hold back the groan at his lips.

"They already emptied my bank account," he revealed as he fell back on the bed, hiding his face in his hands. The tight coil of frustration he'd been holding in seemed to want to burst out of his chest and after a moment's contemplation, he grabbed one of Cooper's pillows and screamed into it as loud as he could, though the sound was muffled through the fabric.

He felt the bed dip as Rachel crawled in next to him. Not next to him, he realized with a start, but on top of him. Her legs straddled his waist as she silently pulled the pillow away from him and set it down beside them. Her hands returned immediately to his face, graceful fingers tracing the line of his jaw and down his neck. Her long hair fell down between them and by instinct he reached up to tuck it behind her ear out of the way.

"What are you doing?" he whispered conspiratorially.

"What I always do when you're upset," she muttered, leaning down to capture his lips in a brief kiss, but it was enough to get her point across, even without the subtle roll of her hips.

"We can't do this here," he argued, though his hands seemed to find the divots in her waist by their own accord. "This is Cooper's bed."

"I know," was her only response before she seized him up in another kiss, this one much more commanding than her first until he gave in. She sighed with content as he took her further into his mouth while delving into hers. The part of him that used to remind him hat these were things he shouldn't be doing with his baby sister was oddly quiet as she took him over completely. In the year since this had started, they had grown more comfortable with each other. Their frenzied grabbing and pulling had given way to moments like this, where it was soft and sweet and they felt they had all the time in the world.

Except the didn't Cooper would be back soon and their parents were just downstairs, completely oblivious to what their youngest children were doing and Blaine wanted to keep it that way. Still, he couldn't resist the feel of Rachel's touch under his shirt traveling up his chest or the way her long legs wrapped around his hips as he rolled them over. She giggled against his mouth as he smiled and his hand dropped to her bare thigh, pushing her skirt up. He was probably the only brother in the world thankful for his sister's short skirts, he mused as his hand ghosted along the edge of her underwear, fingers just barely dipping past the band.

"Not that," she breathed into his ear with a gentle nip at his lobe and he pulled away confused. She slid off the bed, pushing him back down as he tried to follow and her hands made quick work of the belt on his jeans. She directed him towards the edge of the mattress, falling to her knees once his zipper was undone, and reached out to him. The contrast was striking; he was so hard wrapped in her soft hand and he had to bite the inside of his lip to hold back the loud moan that bubbled in his throat as she took him into her mouth. Her tongue worked in unison with her hand, with her lips and he could feel the beginning stages of his unravelling as she looked up at him with dark, blown pupils. She pulled him in further and deeper until he was hitting the back of her throat. His hands clenched into fists, tearing at the sheets underneath him.

"Rachel," he tried to warn her and she abruptly pulled off of him.

"Not yet," she pleaded as she crawled back on top of him. He lay down to accomdate her, legs straddling his once more until she found the spot she wanted, sinking down onto him with a roll of her hips. He could never get over how warm she was, how tight regardless of how many times they did this, and she moved on top of him, creating her own rhythm as his hands on her waist supported her.

He held back for her, but it was becoming increasingly difficult as her breath was coming in short gasps, moans getting louder and louder as she caught up with him. He clamped a hand over her mouth, her eyes simultaneously accusing and grateful as her teeth sunk into his flesh. "You have to be quiet baby girl," he said in a husky rush. "Mom and dad are still home."

She responded by pushing him flat against the bed, increasing their pace faster and faster until they both came, hands clapped securely over the other's mouth as their strangled names fell from their lips. It was a sweet, sweet bliss, coming down from her high and his arms found themselves around her shoulders as she nuzzled against him.

"You know, the hotel I'm staying at this summer?" she whispered with a michevious tone to her voice. Her eyes sparkled with an unspoken idea and he found himself intrigued. She waited for him to nod, to show he was paying attention, before she went on. "Mom and dad got me a suite there. It's a really big room. Lots of places to get lonely in."

And like he always seemed to do with her, he caught onto her suggestion immediately. "Would you like some familiar company then?"

She chuckled, lacing her fingers through his. "You'll have to buy Cooper a new poster," she said, motioning to the tattered remains scattered across his floor, "but I think we could convince our parents it would be in everyone's best intrests for you to accompany me to New York. I know it's not exactly what you planned but-."

"It sounds perfect," he grinned, pressing a light kiss to her forehead. Summer in New York with Rachel, both of them on their own; it was hard to lament for Paris. Sure, it was till Cooper's fault, but Blaine couldn't be angry, at least not this time.

as always: I write, you read, you review, I'll write more... it might even be a prompt next time.