Author's Note: Due to high demand, in this chapter, Natasha seduces Bruce. It's eight pages long in Microsoft Word. Let me know what you think!

WARNING: Sexual content and Natasha/Bruce. Don't like? Don't read.

Natasha rolled lazily out of bed and stood up slowly, stretching her limbs. Clint did the same, though not as lazily due to the fantastic blowjob he recently received. Natasha sure knew how to work her mouth, and he was smiled smugly when he remembered that no one else got her special treatment, save for when she needs to go to certain extents to get information out of someone when she's on a mission. Clint's smile vanished at that thought.

The female assassin stood up and pulled on a red v-neck sweater, then put her hair in a ponytail. She made her way into the bathroom to brush her teeth and hair, then shuffled her way out of their bedroom and into the elevator, holding the door open for Clint who joined her there after pulling on his boxers. He pressed the button for the floor that the kitchen was on and they felt the familiar yet nearly un-detectable jolt of the elevator as it began to move.

Tony was there with Bruce when they entered, Tony taking violent bites of his toast. The two were discussing something intense, concern and confusion in their voices.

"But it can't just be triggered by anger." Tony pushed.

"Well it obviously isn't triggered by happiness. I've been ecstatic a few times since I became like this, and that does nothing." Bruce countered.

"It just doesn't make sense!" Tony threw his hands up in the air, far beyond the first state of confusion, and ended up throwing his toast halfway across the room behind him.

"What doesn't make sense?" Clint asked as the assassins walked into the kitchen.

Tony rolled his eyes, "We can't figure out what else triggers the Big Green Rage Monster to come out of hiding," he pointed his thumb in Bruce's direction, "We only know that rushes of adrenaline and epinephrine make it happen."

"Have you tried other forms of stimulation?"

"Yes, we have. We've tried at least half a dozen." Bruce informed him.

"Speaking of stimulation, Barton, I'm gonna have to start calling you Cockeye. It seems pretty relevant right now, considering the noises I heard coming from your room earlier." Tony said with a smirk and a wink. Natasha rolled her eyes, and a small smile played at the corners of her lips. She covered it up with her mug of coffee and a quick slap to Clint's butt, followed by a wink.

"Amazing, Tony. You've successfully reached a new level of juvenility. Bravo." Bruce said sarcastically and clapped his hands loudly for a moment.

"Impressive, Stark." Natasha added and waggled her eyebrows.

"Save your breath, Stark. You'll need it to blow up your date later tonight." Clint cracked at the billionaire.

Tony turned to him, ready for the battle of wits, "You know, Barton, I'd love to see the world from your point of view. It's too bad that I can't shove my head that far up my ass."

Clint snorted, "I could eat a bowl of alphabet soup and shit out a smarter comeback than that."

Before Tony could make another witty retort, Natasha interrupted them, "Alright, girls, calm down. Keep talking, and one day you might actually say something intelligent, but today is obviously not that day. Now either you can take your petty little catfight somewhere else or shut up altogether. I, for one, am interested in what else can make the Other Guy come out." A professional air came about her, "If you want or need me, I'd be glad to help."

Tony immediately switched his attention from Clint to Natasha. Bruce processed her request for a moment, and a conniving smile crept onto Tony's face.

"I'm not sur-" Bruce started.

"Now, now, Time Bomb. I think we could use her. She could come in handy for the next set of stimulants."

"Next set? But what else is there to try?"

"You'll see. Widow, Banner, come with me."

XXXX

"Into the Cage with you, Banner." Tony nudged Bruce into to an experimentation room that had been cleared out. "Jarvis, scan Miss Romanoff's estrogen levels."

"Why do you call it the cage?" Natasha asked as Jarvis began to scan her. She didn't question why Stark was scanning her hormone levels; she had already put the pieces together.

"It seemed appropriate to call it that. It's where we test different stimulants to bring out the Big Guy. It's got reinforced walls, in case the Other Guy tries to break out."

"Where'd you get enough of the material to make a wall of it that big?"

"You know how the Pentagon has windows that are reinforced with explosion-proof material?"

"Yes, I'm aware of that."

"Well, I know a guy."

"Makes sense that you would."

"I like to think so. Anyway, about this next set of stimulants. What've you got, Jarvis?"

"Miss Romanoff's estrogen and hormone levels are above her normal level."

"Perfect, just what I need." Tony rubbed his hands together and began typing something into one of his various computers. "Banner keeps pestering me to write everything down. You know, the difference between goofing off and science is writing it down. Alright, Blackie. I'm assuming that you already know what I'm going to ask you to do, but in any case, I'm still going to debrief you. I want you to seduce Bruce." He paused, "In the name of science, of course."

"What's in it for me?"

Tony's eyebrows shot up, "Bargaining, eh? Well, if it works, I'll put you in our research."

"Research?"

"Yes, research. If we can figure out what else triggers the Big Guy, we're getting it published in Popular Science."

"And if I say no?"

"If you were going to say no, you wouldn't be here, now would you?"

Natasha raised an eyebrow. "Fair enough. What do you want me to do?"

"Pretend you're on one of your missions and you need to seduce a guy to get information out of him. I'm assuming that you know what to do. Hell, who knows how many times you've seduced Barton? You're a pro at this. Oh, and if he happens to turn when you're in there, he'll be sectioned off from you by another wall of the glass that I'll be controlling. There's a button by the door that'll control it from the inside if you need to. Banner knows to stay behind the line, so just get out of there when he starts to change."

"Do I have a time limit?"

"Nope. You've got all day. But don't actually take all day."

She put herself into that mindset and smirked. "Leave it to me."

Natasha went over to the Cage and pushed open the door. She heard it lock behind her. Inside the Cage, she saw that there was, in fact, a striped black and yellow line that divided the room, and Bruce was on the other side of it. Above the line, there was the very bottom section of what she assumed to be the protective wall.

Step one: Make plenty of eye contact.

"Hey, Bruce." She made eye contact with him as she made her way over to him.

"Hey, Natasha." He crossed his arms over is chest.

"What's up?" She tilted her head slightly and smiled sweetly.

Bruce looked away, "Just planting a garden. You know, the usual."

She giggled as she leaned against the wall next to him, a bit closer than necessary. He scooted away a few inches. They made eye contact again. "So how's all this research and experimentation going? It must be stressful."

Bruce shrugged, "Yeah, I guess. But I like doing it. It actually relaxes me sometimes."

"Turning into the Hulk is relaxing for you?" she looked at him with genuine confusion and concern in her eyes.

He chuckled and turned his attention to the wall opposite them, "No, not that part. That part stresses me out. I've already gotten two optical migraines since we started experimenting."

Step two: Break the touch barrier.

Hey eyebrows knit together and she put a concerned hand on his shoulder, "Is Stark pushing you too hard? Do I need to talk to him for you?"

He looked her in the eyes, trying to justify the situation."No, no. It's not him. It's me. I'm pushing myself too hard. I haven't slept in over thirty-six hours. But neither has he. It's actually convenient that we both suffer from insomnia. It gives us more time for science."

Natasha felt like rolling her eyes, but if she did, it would break character.

Step three: Make emotions known.

"It worries me when you do that. I've seen you fall asleep in the lab here more often than anywhere else in this building." She squeezed his shoulder sympathetically.

Bruce smiled slightly. "Enough about me, let's talk about you."

She removed her hand from his shoulder, "There's not much to talk about, honestly."

"I'm sure there is. I saw you leave the building last night. Where'd you go?"

He's interested.

"I went to SHIELD Headquarters."

"What did you do there?"

"I met up with Coulson. He was there all night. He took me to do yoga somewhere to help me with my cramps."

"Couldn't you have just taken some Ibuprofen?"

"I don't like putting chemicals in my body unless it's absolutely necessary."

"Oh. That makes sense."

Step four: Use pheromones to appeal to his sense of smell.

She reached up to her ponytail and pulled it out, shaking her hair out and exposing more of her neck. She heard Bruce take a deep breath through his nose as she did it. She saw him quickly look away from her and unwrap his hands from around his chest and put them in his pockets.

Score.

Step five: Visual appeal. Done. Red sweater. Men find women dressed in red to be more attractive than women wearing any other color.

Step six: Make the sounds that come naturally to you.

"But before all that, I went to this cupcake shop called Two Little Red Hens, which is run by these two elderly sisters, Myrtle and Marge. They were so sweet, and they made the most delicious cupcakes." She moaned at the memory of the cupcakes, which made Bruce take in a sharp breath. She took the opportunity to scoot closer to him, and he didn't move away.

Nearly there.

Step seven: Show some skin.

"One of them, Marge, also has insomnia. Myrtle has stayed awake with her almost every night when she can't sleep. It's the sweetest thing I think I've ever heard of someone doing." She sighed and adjusted her sweater, pulling it at the bottom, so it showed off more of her skin.

"That is really um- nice of her. Did you uh, did you get any cupcakes while you were there?"

Natasha smiled internally. "We made a batch of red velvet peppermint with chocolate icing and coconut shavings on top. It was delicious. Maybe I could take you there sometime?"

Bruce thought for a minute, "Yeah, I'd like that. You know, I can bake, too."

"Really?" A wide smile graced Natasha's face.

"Yep. Surprising, I know. But many sleepless nights and an appetite of a college student has ended in me learning to bake tons of different things."

"Only baking, not cooking?"

"Oh, I'm a pro at cooking. My best dish is microwavable dinners."

Natasha laughed and rested her forehead on Bruce's shoulder. "You sure are something else."

He didn't even hesitate before he leaned his head onto hers. "Coming from an assassin, I take that as a compliment."

"Why's that?"

"You're less likely to kill me if you've taken an interest in me."

"Oh?"

"You'll want to keep an eye on me. Study me."

Step eight: Turn things sexual.

"Well, you're right about that." She told him as she slipped her head off of his shoulder, leaning it against the wall, exposing her neck. He turned to face her, and mimicked her position.

"Which part?"

"Studying you." She extended her leg and began brushing her foot against his. "You're the perfect specimen. You're a lovely, docile man who can turn into a dangerous creature if provoked. You're fascinating… Compelling. You make me want to study you. I want to explore every inch of you." She punctuated each word and, she said this, her voice became lower and sultrier. She wrapped a hand around one of his biceps and slowly looked him up and down.

Out of the corner of her eye, she saw Stark double over in laughter. She ignored this. She was just getting to the fun part.

Bruce was flustered, and making a poor attempt at hiding it.

"O-oh, I do?" he choked out and shifted the weight on his legs, feeling a hard-on coming.

"Yes." She whispered, looking down at his lips, licking her own.

"How-how would you go about doing that?" he asked, his breath catching in his throat as he watched her lick her lips.

Step nine: Go further.

"Well, because you're a human being, I'd probably have to lay you down on a table, then… Tie you down…" she paused for effect.

"And then what?" Bruce's voice was becoming huskier, his breathing heavier, and his pants tighter.

"Oh, it seems that I've missed a step." She brought her hand up to the top of his button-down shirt. "First, I'd have to remove your clothing." She unbuttoned the top button. "First, I'd start with your shirt." She unbuttoned the second button. "Then your shoes and socks…" she unbuttoned another. "And then your pants…" she looped a finger through one of his belt loops and pulled him closer, unbuttoning two more. "And then your boxers." She tugged at his shirt, untucking it from his pants.

Bruce was almost completely undone. His pants were tight, his face flushed, his head was fuzzy, and his heart rate was rising. He hadn't had this kind of stimulation in… A long time. He couldn't remember the last time this had happened, and he wasn't going to bother trying to think of it now. He didn't know what to say. He felt like he should say something because she had stopped talking. Maybe saying something would let her know that he wanted her to continue. Come on, think. Say something.

"And… You'd be… okay with that?" Yeah, perfect, Bruce. You dumbass. But it worked, nevertheless.

"Oh, I'd be more than okay with that." Her voice was raspy and her cheeks were also flushed.

"What… What else would you do?"

"Then I'd tie you up on the examination table. Bind your wrists, your ankles…"

Bruce stifled a moan as she wrapped her arms around his waist and slid a hand up the back of his shirt, running her nails up and down. Her other hand sent a message to Tony that said "Go to hell," which made Tony double over in laughter again.

"Then?" He said breathily.

"What do you want me to do after that?" she pressed her body to his.

'Oh God. What do I say.'

"I'd- I'd want you to…"

"To what?" she whispered, "To touch you?"

He nodded, and he pulled her closer, their bodies firmly pressed against each other, foreheads against foreheads. She examined his face, checking for any sign of the green color of the Hulk. She saw nothing.

"How would I touch you, Bruce?"

He let out a whimper when she said his name.

She knew that he wouldn't give her an answer. As aroused as he was, he was still the same shy Bruce.

Step ten: Go in for the kill.

"Would I begin with your neck?" she followed that up by pressing her face into the crook of his neck, inhaling his scent, pressing her lips where his shoulder connected to his neck.

He let out a breathy moan that sounded like an "Uh-huh." He had completely forgotten that they were being watched and monitored by Tony.

She checked his neck for any green. She still saw none.

"Then… Would I make my way down to your chest?" She kept the hand that was grazing the skin just above his pants where it was, but her free hand found itself on his chest, and her fingers crept into his partially unbuttoned shirt. He hissed at the touch. She moved her face out from his neck and caressed his face with her nose, lips, and jaw, pressing light kisses on his nose, lips, and jaw. A quiet "Ah" came from him when she ran a finger over a nipple. She smiled.

"You know what comes after that, Bruce?" When he didn't respond verbally, she prodded him on, "Do you?"

He responded by pressing their pelvises together, and she rubbed her groin against his. He moaned at the friction, and she gasped.

Bruce couldn't wrap his head around the fact that she was doing this. He had figured out that this was supposed to stimulate him and it was just another experiment to try to get him to turn into the Other Guy. He understood that. What he didn't understand, though, is why Natasha would agree to this. She had Clint to do this with.

Oh.

That's right.

Clint.

How was Clint going to handle this when he found out?

"Na… Tasha…"

"Hmm?"

"What about… Clint?"

She didn't hesitate. Hesitation would ruin the mood. "Don't worry. He's used to me doing this for missions."

Bruce accepted it and didn't bring it up again. The thought completely left his mind when Natasha's hands found his belt buckle and undid it, then unbuttoned and unzipped his pants. He moaned louder than he had planned to when she grabbed his erection through the fabric of his briefs.

"Did you like that, Bruce?"

He almost didn't hear her. He nodded slightly.

"Do you want more?"

He whimpered as he nodded his head, wanting her to stop talking and continue pleasuring him.

She slipped her hand into the opening in his boxers and he let out a groan as she slowly wrapped her fingers around his fully erect penis.

She slowly began pumping it, running her thumb over the head when she reached it, teasing him, running her nail over the slit. Her grip slowly became firmer and she picked up speed as his breath quickened. She knew he wasn't going to last long, and he was almost there.

She pressed her lips to his ear and whispered, "Come for me, Bruce."

A few seconds and four more pumps later, Bruce let out a loud moan and released himself over her hands, both of them breathing heavily.

XXXX

"Well, I guess sexual arousal doesn't make the Other Guy come out, either."

"No shit, Sherlock." Bruce said from behind his hands that were currently covering his face. Once he came down from his arousal, he realized what he had done, and was highly embarrassed. Natasha wasn't. She had left him to wallow in his embarrassment when they had left the Cage. She had wanted ice cream, and went to hunt for some. That's what she said, at least; she had actually left to give him some privacy and to make sure Clint didn't think she was interested in Bruce now.

"Natasha thought it was fun. Said she needed to practice her seduction skills for future missions, anyway."

Bruce groaned and hid his head in his arms, "Screw you, Stark."