"Fuck!" he nearly screamed out, and she always found it an incredible turn on, watching him writhe subtly with carnal longing. He thrust his hips again, his eyes wide and wary.
Matthew's hands gripped her hair tightly, allowing Eko to push even harder. Then, in a moment of bliss, she bared her teeth, tipping him over the edge. She could feel the warm, salty liquid oozing down her throat, and she swallowed quickly.
With one look at him, witnessing him come apart, Eko sat on her knees. As she took in her view, a triumphant, gloating smile tugged at the corners of her lips, his breathing ragged, as though he couldn't quite control it, and when he took a deeper breath, he had opened his eyes down to her, glaring almost in a sedated awe. "What am I going to do with you?" 
"Oh, many, many things, Commander." Eko smiled, consciously biting her lip. He leaned down, grasped her under her arms, and pulled her to her feet.
Not before returning his hands to grab the ends of her shirt and pulling it over her head. He discarded the clothing before effortlessly removing her bra with one hand. His hands then reached towards her breasts, cupping them, causing her nipples to pucker at his touch.
"You never disappoint," he said with a smile. "But I think you owe me double. For next month too."
Eko couldn't help but savor the moment as she eagerly pulled off his shirt. The fabric yielded to reveal his impressive, chiseled, and tanned body. Her eyes traced the contours of his chest, taking in the ripple of muscles beneath the smooth skin. Her hands instinctively spread across his torso, fingers dancing over the defined lines.
However, as her gaze lingered, it narrowed slightly at the small, faint scar over his left chest, no bigger than a coin. A fleeting curiosity crossed her mind, but she quickly dismissed it, with the soldier life, she could probably find a tapestry of scars across his body if she properly looked. 
Undeterred, her eyes continued their exploration, wandering over the rest of his sculpted physique. From broad shoulders to a trim waist, every inch of him seemed meticulously carved. 
She felt his hands move from her waist. "I'll make it worth your while," Eko breathed as he undid her pants. She squirmed out of them and kicked off her shoes as he spread her thighs apart, and she felt his fingers plunging inside of her. 
"You're so wet," he remarked, the unexpected sensation causing her to moan loudly. His fingers circled around and around and around, torturing her, rendering her incapable of coherent speech. Instead, she found herself purely moaning against his ear, lost in the euphoria of the moment. The rhythm of his touch matched the symphony of her pleasure.
"Are you supposed to be enjoying this?" Matthew asked, his voice low and demanding. The words hung in the air, a provocative challenge that only intensified the pleasure coursing through her. 
Eko averted her eyes, playing the submissive role to perfection. "N-no, of course, hmm, n-not," her breaths came in short gasps. On cue, he grasped her thigh, pulling it around his hip, and thrust into her. Eko gasped as her fingernails instinctively dug into his skin.
He hissed with pleasure as he moved within her. "You like this, don't you, Eko?" he growled.
Her body had already betrayed her, so there was no point in lying. Eko nodded, unable to contain her moans of pleasure. "Maybe we should make this a regular payment thing," she offered, breathless from the assault. "Would you like that, Commander?" 
"That's it," he panted, as her fingers weaved into his hair, tugging him closer. He groaned in response, his arousal spiraling higher, and he dug his teeth into her neck, kissing her harshly.