First time they have sex, collars, chained up Loki, Dom!Natasha, sub!Loki

From the amount of jangling coming down the halls Nat would've assumed it was Christmas if she didn't know any better, and she turned her head just in time to catch sight of one person she never thought she'd see again.

The way he was trussed up it might as well have been a holiday for her. Thick silver chains wrapped around his wrists, binding him not only at the arms but also further up as they connected to a thick metal collar that encircled his throat, leading up to the same muzzle that he'd worn on his way off the damn planet not half a year ago. She'd be lying if she said it didn't set a fire inside her gut, seeing him tied up and bound that way, his eyes flashing as they met hers with a mixture of resilience and fury, just enough to make her grin in spite of herself. If only Clint was there to see his favorite Asgardian chained up like the dog of hell he was.

"Thor," she said brightly, turning first to the golden brother and watching in the corner of her eyes as Loki stiffened, furious. "What brings you and the brat here?"

"We are having issues making by brother agree to cooperate. The Lady Jane is unwell," Thor said with a heavy voice, his jaw clenching as he tightened his hold on the chains keeping his brother silent and obedient. "And Loki alone knows the secrets to helping find the cure. He refuses to talk and I thought, well, you alone have been able to trick the truth from him. Perhaps you might do it again."

Typical Thor to bring up the whole problem in front of the accused, but Nat bit back the sigh of resignation from leaving her throat. It would only make her job all the more difficult if Loki could tell she resented Thor for the request. "I know I do not have any right to request a boon of you-."

"No, I get it. Take him to the basement? Tell them I want him in Cell A." It was the largest and her favorite: camera-less. She was going to have some fun with the demigod in front of her. She watched as Loki's eyes flashed with confusion and distrust before he was hauled off. Nat didn't let herself relax until she watched them go around the bend, making their way downstairs. She was going to need a hell of a lot of alone time after this.

There were moments where Natasha loved what she did. This was certainly one of them. As asked, Loki had been brought down to Cell A, and after she'd dismissed the guard from just outside (because no one else needed to know what she was going to do) she'd stepped in and door had locked with a deep thud behind her. Loki sat on a high-backed chair, the chains connecting his collar and wrists keeping him cemented to the seat as well, and even though she couldn't see his mouth on account it was still covered by the gorgeous gag Tony had created she could tell by the crinkles near his eyes that he was smirking. Good. Let him think he had the upperhand. With slow feet she made her way towards him, biting her bottom lip as she stood above him, staring down. It was nearly the perfect height, she thought, if she removed the gag and lowered the zipper on her catsuit just so. He'd have to crane his neck, but soon enough, well. She fought back a grin and shiver at the idea, instead reaching around to undo his gag with nimble fingers, affording him a brief look down her catsuit. His sharp intake of breath was enough to give her something to go on, and once she pulled away he spat the gag out, watching with contempt at is clattered to the ground.

"Finally," he breathed, stretching his lips and cracking his jaw with a satisfied sigh. Only then did he turn his eyes, bright green and alight with curiosity, to Natasha. "So. You're the one they called in to make me talk once more. Funny how much confidence Thor has in you."

"No."

He paused, mouth open to retaliate before his brow furrowed and his mouth closed, trying to process not only the simplicity of the statement but what it was hiding. "No?"

Allowing herself the smallest of smirks she shook her head slowly, watching his own gaze calculate every movement.
"No. I'm not here to make you talk. I'm here to use you, Loki, and once I've told you you're done, once you've wiped your chin of my come, you're going to look up at me and you're going to tell me thank you. Is that in any way unclear?"

She wished the grin that spread across his lips didn't do what it did to her, wished she didn't want to drag him by the collar into her room, chain him up and never let him see the light of day again. Wished she didn't want him atop her, the chains holding him together jangling, as he fucked her so hard she saw the stars and planets Thor always talked about.

"Perfectly. When do we start?"

It took very little for Natasha to figure out how to disconnect the chains anchoring Loki to the chair, though she left on the ones around his wrist, and once he was somewhat free she grabbed him hard by the collar and threw him down on the ground. He hit with a hard thud, head connecting to the unforgiving floor, but she was already toeing off her boots before he could say anything, kicking them off to the side as she took the zipper of her catsuit in hand and dragged it down towards her navel, her cunt. Loki's eyes widened, and only when she'd slipped off her suit entirely did he say anything, his tongue coming out to wet his lips before speaking.

"You seem to trust me an awful lot." He sounded far more confident than he must've been, guessing by the slightest trace of anxiety in his eyes, even as he used them to look her over in her entirety.

"I don't trust you; I'm using you. You must be used to that by now."

He snarled and rose to-to what, strike her? Attack her?-and with the swiftest of kicks to his legs she had him toppled over again, her foot stepping down on his chest to keep him down. One of her eyebrows rose as she stared down at him. "You were the one who was fool enough to bring up my-what did you call it? Quim?-the first time we talked."

His eyes burned in fury as he stared up at her, lips pressed resolutely together as she towered over him. He could've had her on her back in half a second, so why didn't he? She held his gaze as long as he was willing to keep it there, not easing up from the pressure on his chest until he relaxed beneath her. Only then did she move her foot from his chest, drawing her toe across the cold metal of the collar, her pupils dilating as she thought how good that would feel when she sat on his face, the chilly metal pressed against her skin. She wasn't about to waste anymore time.

"You're going to keep your hands exactly where I put them, and the rest of you is not to move unless I give you permission. Understood?"

When he didn't say anything she tipped his chin up with her foot, watched his pulse quicken in his throat.

"Yes."

"Good boy," she purred as she positioned herself over him, sitting forward on her haunches slightly so that when her warm slit pressed itself to his lips the cold collar pressed against her clit, too, making the breath in her throat hitch. Oh, that was perfect. She allowed herself a soft moan, and as he pressed his tongue inside her, searching out the soft spots that made her tense around him, made her nails bite into his arms where she'd grabbed him to hold tight because oh God did she need it. He worked her as though she were the simplest of machines, his movements smooth and always thinking of what she needed. Even as she sat forward, rubbing her clit harder against the collar so that it worked in time with the strokes of Loki's tongue, he brought his head forward to move with her, as though he couldn't bear to be away from it. Not like Natasha was complaining. She came with the quietest of sighs, her body tensing around his head, heels digging into the top of his head to try and push him closer, rocking her hips against his tongue and lips. He went with it without an issue, and she barely heard the slow whine that escaped his throat when she stood up, legs still shaking slightly, to look down at him again. His breathing was coming in quick, harsh pants now, his eyes glazed over and chin covered in her slick. She wanted to bend over and lick it off, but he did that himself, wiping it on his thumb before sucking her juices off of the appendage.

His gaze met hers, challenging hers for half a second. His lips moved but there was no sound, and it was with a small smirk that she knelt beside him once more, one of her hands reaching out to his painfully stiff cock. "What was that?" She asked, voice sickly sweet as she dragged her nails over his fabric-covered appendage. His spine went rigid and for half a second she was sure he stopped breathing.

"Thank. You." He barely got the words out. She flicked the button on his pants until they opened, slipped the leather down around his knees, and fisted her hand around his cock, holding tight. Too tight. Not that it bothered him any if the flush in his cheeks and the further dilation of his pupils was any indication.

"Louder," she purred, sitting back on her haunches as she examined him in full. Despite not having given him any instruction he'd left his hands where they were on his chest, fingers threaded and holding tight. Interesting. Why didn't he fight back?

"Thank you!" He finally shouted, the last word cut off as Natasha drew her fist up and down his sizeable cock. Not bad. She could work with that. Again she positioned herself atop him and slid down his whole length before he could do anything other than look up with wide, surprised eyes. Thor wanted him malleable, wanted him cooperative? She might as well take the fun way of breaking in the pampered princeling. Once he was fully seated inside her she let out a low hiss, the man's organ much larger than she'd originally anticipated, and though it felt like heaven by the time she got to rocking her hips she had to force herself to adjust rather quickly. He let himself moan beneath her, the chains clinking together softly as she fucked him as hard as she could manage, her breasts heaving as she bounced atop him, swirling her hips every so often when she thought he was getting too comfortable. His back arched beneath her and she leaned forward to grip the chains connecting his hands to his collar, heaving him up by it so that she could slam her lips against his, all teeth and dominance, demanding that he relinquish his hold on his control to her.

And relinquish he did, moaning beneath her lips as he melted against her. One of his hands managed to snake down and rub at her clit, and with her free hand she grabbed him hard by the hair and ripped his head back by his black locks. She dragged her tongue over his chin, where her come had once been spread so that the taste was shared between the two of them, before she bit down on his throat, marking him as her own. He tasted heavenly, and with his cock inside her she couldn't help the way her body seized up and tightened around him, muscles squeezing him with everything they had. His own hip movements stuttered beneath her and she growled as she pulled off of him just in time to suck him down in her mouth, swallowing everything he had in a swift gulp. No way was he getting the privilege of coming inside her. When she pulled away from him she pulled him closer, nearly bending him over in two, so that she could kiss him again, shoving her tongue down his throat until he would never get the taste of the pair of them out of his mouth.

"Thank you for your cooperation," she murmured in his ear when she pulled away from him.

"Thor, your brother's ready for you when you are," Natasha said, arms folded over her chest, her catsuit back in its usual immaculate form, her expression as guarded as it got. Even Thor knew better than to ask what had just happened, but she squeezed his shoulder as he passed her. "He should answer any questions you have," she promised him with a small smile. "Good luck with Jane."

"Thank you my lady. If there is anything I can do to ever help you again, you will let me know, won't you?" Thor asked, his eyes searching hers, practically screaming his thanks.

"Oh don't worry. I'll think of something," she said, unable to stop herself from smirking as he left. Maybe she'd have him bring his baby brother over again so long as he was marched to her room in the same bonds.

A/N: I think this is my favorite thing I've ever written. Just saying. Thanks for reading!