Training Day, a captain america fanfic

Written for Days 8 and 10 of Kinktober 2021.

This is an explicitly adult story containing cunnilingus, a praise kink, hickeys and bite marks, and graphic sexual content. Please do not read if any of this is uncomfortable for you.

The fluorescent lights of the gym hummed above the pair sparring on the mats below. Grunts and curses and jeers filled the air between them by turn, teasing smiles turned to sweaty glowers as James Barnes pushed Lina harder than ever before. She barely blinked before he moved like a striking snake, faster than lightning, and pinned her body against him in an iron hold.

"Come on, you can do better than that," James taunted as he easily held her in place. The full globes of her ass pushed against him, and he felt himself twitch in response.

Lina huffed and strained against his hold, painfully aware of every inch of his body pressing tight against her back. "I can't."

"You can, you're just not trying."

The heat of his breath puffed against her ear, raising a wave of prickles down her arms. It didn't take much more than that tickle of warm air along the shell of her ear to have warmth blossoming in her stomach, and it had nothing to do with training. She jerked against him then, failing to break his hold though she was finding it hard to care when his hold tightened on her wrists and about her waist.

"C'mon, sweetheart, I wanna see you fight me," he practically crooned. Blue eyes fluttered at the tickle of her curls against his neck, and he couldn't resist the urge to grind himself lightly against her. It wasn't enough to offer any relief, but that wasn't the point. He meant to tease her with promises of what would come after. "Be a good girl and show me how far you've come."

Lina jerked against him once more, his words sending lightning bolts coursing through her veins. "You're wicked."

His tongue darted out to trace the shell of her ear, teeth nipping at the fleshy lobe. "You love it."

Liquid heat pooled between her legs and she knew she was a goner. Still, she knew he wouldn't give her what she wanted until she broke free. He was a tease and a dedicated instructor. James wasn't one to let his libido get in the way of a lesson. She went lax in his arms, allowing the dead weight of her body throw him so slightly off balance. In that heartbeat, she snaked a foot around his ankle and pulled with all her might.

He toppled then, his hot, hard mass coming down atop her. Somehow, Lina twisted so that she straddled him, chest heaving and muscles tight with need. Pride glinted in his impossibly blue eyes, lifting the corner of his mouth in a quiet approximation of a smile.

"Good girl," he purred, smirk growing at the shiver of delight that ran through her weary muscles.

Lina felt him hard beneath her, the adrenaline and their closeness affecting him just as much as it had her. She knew he wasn't immune to the sight of her body in her tight leggings and strappy sports bra. Throughout their training session, she'd felt his gaze searing into her as he traced each curve and followed the line of every bead of sweat that ran between her breasts or down her back. With a pleased huff, she undulated her hips against the evidence of his desire.

"Am I?" she asked, panting as the movement of her hips did little more than tease them both. "I thought you liked me better when I misbehaved."

"Sweetheart, I like you all the time," James said thickly. His hands gripped her hips with the effort it took to stop himself from pressing her harder against his cock. "But I especially like you like this."

She bent to ghost her lips along his throat and tickled her nose down the line of his jaw. "How's that? Sweaty?"

"On top and hot for me," he groaned when her lips found that spot under his ear. Her hips never stopped their slow undulation. His fingers tightened there until he was sure she'd bruise, but that didn't seem to bother her one bit. "But there's one thing I like better."

Quick as a flash, he bucked his hips and rolled until she was pinned beneath him with her wrists caught in his vibranium hand. James couldn't hide a grin at the sight of her blown out pupils and heaving chest. The bones of her wrists were so delicate that he could hold her in place with just one hand, something he knew she enjoyed as much as he did. She was nearly dwarfed by his body over hers, thin arms held above her head and back arching while toned thighs cradled him close.

His free hand traced a line from her full bottom lip down her throat and valley of her breasts until it reached the waistline of her tempting black leggings. Each twitch of her muscles and desperate gasp sent a thrill of desire jolting through him until James couldn't resist touching her once more. His fingers trailed lower to expertly circle her swollen bud, the resulting curse making his stomach flip and work her more.

Lina wriggled her hips against his touch, desperate to feel more, to get closer than her workout gear would allow. Every practiced pass of his fingers had her neediness mounting and want pooling low in her belly.

"What do you want, baby?" he purred, his every touch meant to torment her. She let out a strangled mewl of frustration, the whine only making him smile. "That won't cut it. I want to hear you say it."

"Tell me what you want to hear and I'll say it," she rasped, her hips bucking against his hand in a desperate bid for more.

"Nice try," James teased. He caught the front zipper of her sports bra in his teeth and tugged it down until the damp material fell open and exposed her heaving breasts to his hungry gaze. "But it won't work."

He captured one pink nipple in his mouth and sucked, his tongue flickering against the sensitive peak. She bucked against him once more at the sudden sensation that sent heat unspooling through her limbs, whining when he released just as she was sinking into it. His tongue traced a path from her navel up between her breasts, the wet line cool against her heated skin.

"Fuck," Lina gasped.

"That's the idea," he teased, his hot gaze devouring the sight of her beneath him and powerless against his knew he'd stop in an instant if she so much as breathed a hesitation, but he could feel the way her thighs trembled about him. She enjoyed this game as much as he did. "Just tell me how."

She flushed a deeper pink then, something he hadn't known was possible. "I… I want…"

James cocked his head at her hesitation, the fingers between her legs never letting up their teasing caress about her clit. "What? Say the word, sweetheart, and I'll give you whatever you want."

"I want… your mouth." Lina was positive that her face was going to catch fire with the heat of her blush. It wasn't an act she'd known she enjoyed until him-before then, it had always seemed like a chore, something cursory to make sure she was wet enough for penetration and nothing more. But with James… Well, he'd opened her eyes to a lot of things, and this was one of her favorites. This was also the first time she'd requested it so bluntly.

He dropped a kiss against her sternum, the touch somehow intimate and innocent all at once. "My pleasure."

James pressed himself against her, capturing her lips in a fierce kiss that set her smoldering all over again. She strained against his vibranium arm, hands itching with the need to touch him, bury themselves in his hair or trace the hard muscles of his back, but he held her firmly in place. Lina was completely at his mercy, and she loved it.

His teeth nipped at her throat before his lips and tongue soothed her pinkening skin. The stubble of his beard was rough against her sensitive skin, burning and teasing as he worked his way along her collarbone before dipping down to capture her other nipple between his teeth. She bucked against him when he tugged at the rosy peak, pain mingling with pleasure as his fingers stroked incessantly at her clit.

"If I let you go so I can take off these pants, will you behave and keep your hands there?" James asked between kisses scattered along her chest and belly.

"One way to find out," she murmured with a grin.

He nipped at the underside of her breast before releasing her to slide the tight material of her pants down her legs, certain to take her cotton thong off too. Black fabric bunched at her ankles, leaving her bare to his hungry gaze. James watched her for a moment, stretched out on the worn blue mat and exposed just for him. Anyone could walk in on them, but neither seemed to care. All that mattered was the ache between her legs and his eagerness to satisfy it.

James kissed a path up from her knee to the apex of her thighs, his hot breath ghosting over her folds before his lips trailed a matching path down the other leg. Every brush of his lips and nip of his teeth sent a fresh wave of anticipation rushing through her.

He could feel every quiver of her legs and smell the heat of her arousal grow strong with every touch. He sucked a mark on to her thigh, a souvenir for her to discover later, and grinned at her breathy mewl. He loved the noises she made. Each needy whimper had him growing harder and more determined to make her shatter.

It was that little noise that had him parting her folds and drawing the flat of his tongue from the base of her slit up to her engorged bud. His lips closed about her insistent clit and he suckled there until her thighs quivered once more.

Lina was lost in the sensation of his talented mouth on her, the vague thought that she wouldn't care if the rest of the team walked in on them. She couldn't stop now, not even if they had an audience. She didn't want his mouth to leave her, so awash on a sea of sensation was she. Every lap of his tongue and press of his lips had her circling higher. Distantly, she knew she must be flooding his face with her pleasure, but she didn't care.

Her hands flew to bury themselves in his hair when he pressed his tongue inside her for the first time and her belly tightened with the first signal of climax. Every pass of his tongue and suckle of his lips set her closer and closer to a boil. Bursts of light and color came faster and faster behind her eyelids as the heat built, coiling tighter in her belly like a spring ready to loose. Lina knew that she would shatter harder the tauter she grew.

James sensed her impending implosion and slowed, grinning when he heard her desperate whimper. Distantly she knew that she was tugging his hair, something that had James moaning into her. The vibrations of his sounds of pleasure had her gushing against his face and he eagerly lapped up every drop. He held her hips steady as he teased her, stroking along the curve of her hipbone and delighting in every tremble.

"Fuck," she groaned, shifting against him as she sought more. Frustration mingled with heady desire as he edged her. "James…"

The pleading note in her voice told him how needy she was. He sucked at her aching bud once before teasingly circling it with his thumb so he could look at her properly. The pink flush of her skin from her cheeks down to her heaving breasts and half-open mouth had him growing impossibly hard.

"I want to hear you beg, sweetheart," he purred darkly. His thumb never stopped working at her, keeping her right on the brink of orgasm without giving her the release she so desperately yearned for. "Beg me for it and I'll let you come."

Lina's eyes flew open at that and her skin heated even more. "You… what?"

"Tell me how much you want it."

"I… fuck, James." Her head fell back and hands rose to toy with her breasts when he pressed her harder and faster to make his point. "Please, mésange. I-I need it, please. I need… I need…"

"What? What do you need?" he asked roughly.

A guttural moan tore from her throat, brow furrowed and damp with her desperate need to reach her end. "Please, James, please... Let me come, please."

That was all he needed to increase the pressure on her clit and slide two cold, vibranium fingers inside of her. Her back arched at the intrusion though she didn't protest. He quickly found the spot within her that had her walls fluttering about his fingers and back arching off the mat. James steadily worked her towards her peak, something that only took a few curls of his thick, metal fingers and steady, firm circles of his thumb on her clit.

He lowered his mouth to her, merrily lapping up her juices when she imploded around his fingers. A wild cry burst from her lips as she came, echoing about the otherwise empty training room. She fluttered around him, squeezing his digits with her tight muscles in a way that set his cock to twitching in time with each pulse of her walls. He continued working her through the aftershocks of her orgasm, mouth never leaving her clit and pussy-warmed vibranium fingers steadily continuing to fill her.

"I love watching you fuck my hand," he said thickly, nipping at her thigh for emphasis. The contrast between her slick, pink flesh and the cold metal was a sight that regularly haunted his dreams.

Lina panted as she returned to herself after the intense sensations wracking her body dissipated. Blinking, she slurred, "I'd rather fuck you instead."

James was on her in an instant, his mouth nipping and sucking along her neck, leaving a trail of red marks that wouldn't soon fade. He worked down the column of her throat to her breasts where he paid them the same attention, branding her soft skin with his mouth. Some primal part of him wanted her to know that she belonged to him, that it was his mouth that marked her body with the dark cherry stains. Her walls clenched around the fingers still buried in her pussy when he harshly sucked her nipples into his mouth, one at a time.

He released her left breast with a lewd pop and began working his hand between her legs again. "I want to fuck you right here. WIll you let me do that?"

"Yes," she hissed, grinding down on his hand.

"You're going to ride me, doll," he growled, pressing harshly against her clit. "I don't care if someone walks in-you just keep fucking me, show them what a good girl you are for me."

She nodded her assent, so far gone that she only half-registered the filthy words streaming from his lips. Lina didn't care; she'd do anything he wanted if he just kept touching her like that. Her body began coiling tighter again with his filthy praise, her world narrowing to his voice and the way he handled her needy arousal.

James watched her hungrily as he withdrew his fingers from her slit. The rough keening noise she made at the sudden emptiness was like a blow to the gut. His cock twitched when her slender hand moved to replace his, but he gently smacked it away before smacking her clit for good measure.

"Don't misbehave, sweetheart," he warned. He licked his lips at the fresh flood of arousal that glistened on her swollen lower lips. "I don't want to punish you. Will you be good for me?"

"Only if you let me come again," she whined.

An animalistic grin flashed over his face as he worked off her shoes and pants, leaving her legs bared and spread for his enjoyment. "This isn't a negotiation. Stay like that until I say so."

He waited for her nod before moving to divest himself of his clothes. James gave himself a couple firm pumps before settling beside her, his weeping cock standing proudly in the air. His hand ran down the length of her torso. Every shuddering gasp and twitch of her thighs sent a shot of heat spearing through him, but she still didn't disobey him. Her legs remained lewdly splayed open with her glistening pussy on display.

"Come here, sweetheart," he purred, smirking at the speed of her movements as she shifted to straddle him. His fingers squeezed the plump globes of her ass, slowly dragging her wet folds along the sensitive underside of his cock. "You're so good for me, doll. You're such a good girl, I think you've earned a reward."

Lina gasped at the effect his words had on her. Her nipples tightened painfully in the cool air and her belly tightened with the praise. It was wholly unlike anything she'd ever experienced. The way his voice purred every time he called her a "good girl" hit her core, sending liquid heat flooding her veins and suffusing her limbs. She was certain she'd do anything he wanted if he kept talking to her like that, making her feel like that.

His hand snaked between them to press the head of his cock against her slick entrance. They both hissed as she slid onto him, taking him in until his hips were flush against her ass. She started moving, her hips undulating in a delicious friction that had them both releasing shuddering breaths. James let himself fall back on the mat as she moved above him. Her breasts bounced with every twist of her hips, and her slick, silky walls squeezed his cock so securely that he half-marveled at the way she glided around him.

"Touch yourself," he breathed, content to watch her use his body to pleasure herself. He twitched inside her as her fingers dipped to circle her clit.

She bounced atop him faster, sighing with pleasure as he stretched her and flooding his cock with her pleasure. Lina rode him like her life depended on it. The delicious burn of her muscles as his heavy girth filled her just sent her spiralling higher. It wasn't long before he was bucking up into her, meeting each pass of her hips with thrusts of his own. Little gasps and cries of pleasure spilled from her lips to mingle with his moaned praise.

"That's it, baby," he murmured, hips pressing higher to bury himself harder and deeper inside her. "You take my cock so well-fuck, you're a dream, Lina. The way you feel, the way you taste…" He watched her lean back, supporting herself with her hands on the mat between his knees, to give him a better view of the way her pussy gripped him. "How do you always know what I need, doll?"

His thrusts became harder and more erratic as he watched himself split her open, his turgid flesh shining with her arousal. He could feel his end building low in his belly, knew it would only take a few more pumps before he emptied himself inside her. Her walls fluttered around him, signalling her own impending orgasm. James circled her clit in the way she liked best, desperately holding back his own. He wanted to feel her come undone around him before tumbling over that cliff after her.

Her motions grew irregular as he touched her. All she could think about was the pressure building in her core and fireworks exploding behind her eyelids. She was awash on a wave of pleasure, and heat, and the lightning beginning to zip through her veins. He stroked that spot inside of her with every thrust, her keening noises filling the air and growing ever more desperate.

"Come on, Lina," he panted, circling her clit faster as sweat beaded on his forehead. "You're almost there, I can feel it. Let go, doll. You're squeezing me so tight-I know you're ready to come. Come for me, baby. Come."

She started trembling with the force of her climax, her walls fluttering around him before clenching down in a vice-like grip. Lina's head fell back, her long curls brushing against her lower back as she came, and James quickly fell over the edge as her pussy milked him for all he was worth. Hot jets of cum filled her as his hips stuttered against her, filling her to the brim and marking her as his from the inside.

As the pleasure faded, Lina collapsed against him in a sweaty, panting heap, though his cock stayed buried inside her. Her breasts pillowed against the hard plane of his chest, their sweat-slicked skin sticking with every heaving breath.

"You're incredible, sweetheart," he panted. His cock slowly softened inside of her before slipping out.

Lina could feel his cum dripping out of her, painting her thighs with their mingled fluids. She knew she shouldn't enjoy the sensation so much, but that didn't matter. With a kiss to his stubbled cheek, Lina pushed herself off of him and went to look for her clothes. James missed her solid warmth against him, but didn't protest. Instead, he reached out to stop her movements and pressed against her knees until they parted once more. She looked back at him over her shoulder, face flooding with heat at the dark way he focused on her dripping slit.

Her thighs were slick with the fluids seeping out of her, and he committed the image to memory. He never wanted to forget the sight of his creamy cum dripping from her pink folds.

"Fuck, Lina," he groaned. "You're such a good girl."