A/N: Thanks as always for reading and especially reviewing-I love hearing from you! Managed to get this one out in a timely fashion-hopefuloy that continues to happen :) smutiness ensues!

Prompt: Obsessive/Possessive behavior

Deb can feel his eyes on her across the room. Amongst the dozens of gazes focused on her, their leader, it's his that penetrates. It takes every ounce of her conviction not to turn her eyes towards his, to suppress the warm feeling brewing beneath her navel. She turns toward the board behind her, finger lifting towards the victim's picture, the words flowing easily from her mouth, her insides squirming.

She can feel his laser like stare zooming in on her neck, that spot that makes her knees weak, her pulse race. She swallows hard, looks over to Batista and lets him take over so she can step back and take a breath. As Angel describes the search for the perp, she finally allows herself a peek. Deb forces herself to casually scan across the room, her eyes flitting finally to their desired location; the sharp gaze of her own brother.

Dexter acknowledges her look, the rising flush into her cheeks, with a small smile. The edges of his mouth curl up mischievously, mimicking the lustful look he gives her when his fingers find their way between her legs. She's on the verge of moaning when he cocks his eyebrow at her and chuckles.

"LT?" Angel's voice is right beside her and she whips her head back to him alarmed. "Any additional thoughts Lieutenant?" Angel asks seriously, but there is a flicker of amusement in his eyes.

Deb's eyes dart back towards the full room, the many faces impatiently waiting her stare back and she can feel a new kind of flush burning beneath her collar. "Uh…um….I-I think we got it." Deb grimaces at her stammering, takes a small breath and tries again. "Let's get back to work." She says a little too brightly as the department begins to move about and shuffle out of the room. "Fuck." She mutters beneath her breath.

"You ok Deb?" Angel smiles down at her as she swipes her hand across her forehead.

"Uh, yeah. Just um…my mind was wandering."

He smiles gently back at her and nods. "I get it. You should probably get some rest, huh?" Angel saunters out of the room nodding at Dexter as he passes.

Alone in the conference room, Dexter's gaze comes back to her, their eyes locking. "You ok, sis?"

She rolls her shoulders back instead of biting her lip and shrugs at him cooly. "Fine." She moves towards the door, walking past Dexter in the process. He puts his arm out, blocks her path. Dexter looks down at her slightly, brings his lips next to her ear. "I wouldn't want you flustered." He whispers, the heat from his breath causing her to shiver just enough for him to notice. He pulls back slightly, satisfied.

But Deb is proud, and letting him win so easily is not an option. "Don't worry bro, I'm cool as a fucking cucumber." She smirks at him as the door to the conference room swings open, interrupting them.

Quinn stands in the doorway, clutching a file, an eager expression on his face. "Uh Deb…can I talk to you?"

Deb smiles back at him warmly. "Sure." Without a second glance at her brother she follows Quinn out the door with a flippant "See ya Dex."

Warily, Dexter follows them out of the conference room slowly moving back to his lab as Deb leans towards Quinn, quietly pointing at the file they share. Once in his office with the door closed, he stares out through the blinds, takes note of the way Deb leans over Quinn, one hand on his shoulder. He frowns at the interaction then determinedly shuts his blinds with a snap. Out in the main room the sound draws Deb's attention and she glances up at Dexter's now hidden office. Satisfied, she smiles to herself and thinks that maybe she has managed to teach him a lesson.

Hours later Dexter stands at the threshold to Deb's office, the lamp on her desk the only source of illumination in the deserted department. It doesn't take him long to realize she is too engrossed in her work to notice his presence and he clears his throat conspicuously eliciting a startled gasp from her as her head jerks up to see him. Seeing his smirk she sighs, rubs her fingers against her forehead, "Fuck, you startled me."

"Planning on working all night?" Dexter slides into her office further, sidling up to her desk.

"So many fucking things to read." Deb mumbles more to herself than him. Her head is still bowed over the open file as she chews on a nail all but forgetting his hovering company.

Impatiently Dexter reaches over, pulls on an edge of the file, forcing Deb to pull her hands away as he closes it purposefully. "I think you've had enough." There's something menacing under his playful tone. Something sharp enough to cause her not to argue, pushing away from her desk instead so she can stand up and find herself at eye level with him.

Deb comes around the desk but Dexter blocks her path and steps close to her. "Seems like you and Quinn are getting along these days."

Deb looks at him askance and shrugs non-committedly. "I think he's over it."

"Over you?" Dexter asks skeptically. "That's not how it looks to me. I would say you two looked a bit cozy."

Deb frowns at him, partially pleased that he seems irritated yet concerned that she may have pushed it too far. "It was nothing." She replies casually. But when she tries to move past him he grabs on to her hip and guides her back to meet the desk behind her.

"It wasn't nothing." His eyes bore into hers, the gaze heated and demanding. "I see how he looks at you. I saw the way you touched him."

"I was helping him with a fucking case." Deb fights back. She thinks about pushing him back, but the feel of his firm body against hers feels too fucking good.

"You won't touch him again. You won't be doing that anymore." Dexter tells her sternly.

Deb scoffs bitterly. "What? You think you can tell me what the fuck I'm allowed to do?" She pushes at him harshly, done with the conversation and angry enough to want him gone. But Dexter is like a boulder, totally immovable, her hard shove barely warranting a flicker of movement from him.

He leans further into her. "I think you'll listen." Before Deb can curse at him again, he presses his palm against the seam of her jeans, pushing it against her clit, sending delicious sparks across her hips.

His palm rotates steadily as he nuzzles her neck and grazes his scruff against her skin. "You're mine." He growls against her ear, his nose brushing against her cheek.

"Dex…" Breathlessly, Deb looks up at him and moans despite her lingering anger.

"Say it. Tell me you're mine." He commands her, his voice burning in her ear.

"No…" Deb manages softly as his fingers push against her, his other hand popping open the button of her jeans and coaxing the zipper down. His wicked hand slips quickly inside her jeans and past her panties. Her eyes slide closed as his fingertips make contact with her bare flesh. His free hand slides up her back, holding her in place.

"Mine" He whispers as he watches her head fall back and her lips part.

Past the point of all argument, Deb's only response is "Uhhh…"

"You belong to me." He tells her as he slides a finger into her wet heat and uses his thumb to tease her clit.

Too lost in her pleasure, Deb doesn't even respond, testing Dexter's thin patience.

"Deb, look at me. Open your eyes." This time he moves his hand away from her back and roughly yanks her chin down. "Tell me."

She whimpers quietly but her eyes gradually open, locking onto his scorching gaze. "Yes…yes." She struggles to catch her breath. "I'm yours…y-yours." Deb stammers out.

Finally satisfied he leans down and roughly kisses her, pulling her lower lip between his teeth. He stops his ministrations long enough to undo his pants and free his stiff cock. He yanks on Deb's jeans and gaining access he pushes into her with reckless abandon.

Having finally given into him Deb reaches for Dex, her hands clutching at his shoulders as she gasps with pleasure. They move roughly together, their hushed groans filling her office. He takes her lips in a hurried kiss, their gaze holding despite their coarse movements.

"Mine." He tells her once more and it's enough for her to go spinning into oblivion, shouting his name as her orgasm hits her. He follows close behind, holding tightly to her, her name on his lips.

They are still as their pleasure subsides, but he doesn't let go of her just yet. "I don't want you touching him again." It's less a request than a demand and instruction.

Yet Deb surprises herself when she nods complacently and kisses his lips. "I'm yours" She agrees, because she knows that its true.