Author's Note:
The following events take place during the first Avengers movie.
Most of the movie's events remain the same unless otherwise stated, though I may reorder some of the chronology for the sake of pacing. I jump around through the story so this works better if you remember the movies well.
Of course, Marvel owns all the rights to these characters, and there will be spoilers for the films involved.
********
"There's not many people that can sneak up on me," Loki said, turning to face her with that devious grin of his.
"But you figured I'd come," Black Widow replied, knowing he was just as likely bluffing.
"After. After whatever tortures Fury can concoct, you would appear as a friend, as a balm. And I would cooperate."
"I'm not here on anyone's orders."
Stone-faced, the agent pulled out her phone and tapped away for a moment. With a final swipe of her finger, all the CCTV in the room powered down. Spotting the cameras droop down and point at the floor, their red lights flickering off, Loki looked pleasantly surprised.
"S.H.I.E.L.D. has all the best apps," she quipped, though she knew he likely didn't know the meaning of the word. "Now - I wanna know what you've done to Agent Barton."
"I'd say I've expanded his mind."
"And once you've won. Once you're king of the mountain. What happens to his mind?
"Is this love, Agent Romanoff?"
"Love is for children. I owe him a debt."
"Tell me," Loki said, sitting down.
She knew he would take the bait. If he thought he could exploit their weaknesses, she'd give him one to distract him. He'd be toying with her, never knowing he was being manipulated. So she pulled up a chair and told him a story, or at least the cliff's notes version.
"What will you do if I vow to spare him?" Loki asked.
"Not let you out..."
"Ah, no. But I like this," he laughed. "Your world in the balance, and you bargain for one man."
"Regimes fall every day. I tend not to weep over that, I'm Russian... or was."
"You're not nearly as strong as you believe, there are cracks in your armour. It was helpful knowing someone close to... point them out for me."
Natasha knew these words were coming, but they hit home all the same. Her defenses were weakened, she had seen too many... unexpected situations lately. She felt off-kilter.
"What, did he tell you about my first time? Not as romantic as I'd hoped."
"Your relentless dedication to sarcasm is admirable, but you are closer than you might think, stumbling in the dark as you are. I know what the archer knows, and he knows more than he lets on. His polite reserve is not one I share."
"What are you getting at?"
"Did you really think you wouldn't have been monitored by your own agency during your first missions? Barton watched and listened to your every move, even the ones you thought were private."
Natasha's stomach dropped, her eyes widening for a moment before she controlled her demeanour.
"S.H.I.E.L.D. remembers the Budapest mission one way, but there are plenty of details only the pair of you share. I'm sure your target was pleased to sodomise a real virgin. A virgin of sorts, I suppose... I've got to say, from his descriptions - you handled the situation marvellously."
Natasha took a deep breath. 'So this is where this is going,' she thought to herself, trying not to think back to the night he was referring to. She would interrupt, but she needed him to take charge of the conversation if he was going to give her anything.
"I know that you've slept with many during your adventures - using all the assets at your disposal. I don't doubt your wares would serve you well during Thurseblot. We used to have the most extravagant of revelries, with all the women - or men - you could ever dream of having. We used to visit Midgard to-"
"Are we really talking about some Asgardian banquet right now? I don't think you're invited to those things anymore," her patience fading as he got off topic, "what with all the throne-usurping, death-faking, world domination attempting..."
Loki paused, a glimmer of anger flying over his face, before that deadly smile appeared once more. Maybe that was a mistake.
"Yes. Where was I?"
"I came here for a -"
"It was a warm summer evening, August, when he entered you from behind, taking your tightest orifice for the first time. The archer felt sorry for you, for a fleeting moment. It didn't take long for your pain to transform, with an arms dealer you hated no less, into something more... pleasurable."
Natasha was growing bored of his lyrical recounting of her own past, but couldn't help but think back to the moment he's talking about. The situation wasn't ideal, the partner neither, there was discomfort... but there was also a feeling of taboo, like she was getting away with something.
***
As her virgin asshole began to relax and better accommodate his hard member, she let herself go a little to make the whole thing go a little faster. She wasn't Natasha, or Natalia, or anyone real - right now she was playing a role, and didn't feel judged at all for letting the feeling rise. It was a new feeling, unlike anything she had ever felt before. He thrust into her once more and she let out an involuntarily moan, the first she hadn't faked since he first penetrated her.
***
Natasha focused, her mind having wandered off for a moment, back to a different time altogether. That was then, this was now - a less fun mission, but a mission all the same. She had no shame to bear about what she did, even with Loki knowing - but Clint? All their conversations and work they had done together, all that time and he had known what she looked like with a dick deep inside her ass?
For a moment, the agent was perplexed to feel a tingling sensation, but not in the same place she had been experiencing it lately. It was anticipation, as if she was back in that hotel room once again. And when her eyes opened, she was.
***
Natasha found herself naked, on all fours, in the warmth of that climate. Her bewilderment gave her pause, but only a moment's pause, as she was reminded exactly what year, what day, what hotel room she was in.
Fingers slid through her red locks, much longer back then, and gripped tightly. Her hair was pulled back, and as her neck arched and her ass was pulled backwards, she felt his hardness against her entrance. With a sudden, forceful thrust, his full length was inside her, all the way to the hilt.
***