Disclaimer: I'm not even sure I own this overactive imagination, so no, nothing is mine.

Letting Off Steam:

What usually occurred any time the Lullaby was put into effect on The Hulk was that Bruce would return to find himself exhausted and drained and he would be laying on the ground wherever Natasha performed it. At least that was how it worked the last dozen times.

Lullaby number thirteen turned out quite different. Sure, he came back to his senses in the middle of the woods wearing only his pants, as per usual, but he was by no means tired or drained. Bruce was something else entirely that he couldn't make heads or tails of in his post-Hulk haze and he was actually still on his feet.

"You alright?"

Her voice made him turn his head in Natasha's direction as he glanced over the dark red and endless waves of hair that went past her shoulders. She stood casually with her arms crossed a few feet away but those deep green eyes were studiously watching him with the barest semblance of concern. He wasn't entirely sure how to respond to the question and he glanced away and looked around.

"Bruce?"

This time the concern seeped a little into her voice and he turned his eyes back on her for a moment. "I need a few minutes," he told her.

Her brow ruffled just slightly before she shrugged, "Alright."

But she didn't go anywhere and he realized he forgot to emphasize on that, "Alone."

Natasha's face didn't change much as folded her arms across her chest, "What's going on, Bruce?"

"I'm just..." he sighed a little. What was going on? What was going on was that he had enough energy to power a small town and that was putting it mildly. Bruce wasn't entirely sure how to explain that he was frustrated beyond belief at the moment and he just needed a few minutes to get it out. "Frustrated..."

She blinked a few times at that. "So hit a tree or something, let it out," and if it weren't for the way he was feeling right now, he might have actually laughed at that.

"It's not—not that kind," he groaned out in disbelief.

"Oh." He turned around fully and watched as she studied him with curiosity before one corner of her lips curled upwards into this slanted little smile, "Oh."

That did not make things better.

Her eyes shifted from his face, to his chest and then lower before the other corner of her lips quirked up. Natasha gave him a rather coy look to go along with that ridiculous little smile, "You need a little help with that?"

There was no way she was making that offer with any sincerity and he groaned before shaking his head. "Just, please go somewhere else, Natasha?" he requested again.

Of course, Bruce has been proven wrong about many things with her many times, and this appeared to be one of those moments. Her head tilted to the side just slightly and he thought for a moment she was going to do as he asked. Instead she stepped forward and moved towards him and he froze a little when she tugged at the zipper at the front of her catsuit.

"W-what are you doing?"

"You need to let off some steam, Bruce," she purred as she stepped just in front of him. The zipper was pulled down enough to show ample amounts of skin and curves and he sucked in a breath.

"Natasha..." he warned gently. All that frustration made it near impossible to deny her when the invitation to have her was so clearly open and available. And unzipped.

Bruce blew out a breath as she took a step even closer, took his hand, and placed it on the zipper that rested halfway between her breasts and her navel. It was enough to take away the last of the will he still had left to send her away. He tugged the zipper further down and pressed his lips to her neck as his hands moved to push the uniform down off of her shoulders. He could feel her kicking off her boots and she pushed them away as he moved her back. His mouth trailed a path from her neck and up to her mouth until her back hit a nearby tree.

Natasha didn't seem at all fazed by the sudden halt in movement and he was left reeling as her lips devoured his own the moment her tongue snaked its way into the fold. She did seem a little surprised when he broke the liplock and left a trail of kisses from her mouth, down her jawline, until he finally reached her neck again. The tiniest noise escaped her, some mixture of a sigh and a moan, and it came as equal surprise to both himself and to her. It seemed to Bruce that he had hit the right spot and he moved his lips back over it until the noise emitted from her lips again.

Her hands pressed against his chest, fingertips leaving a small trail down and he groaned a little at the contact. She was wriggling the suit the rest of the way down until she kicked that aside as well and he worked his hands around her bra as she tugged at his worn out pants. He tossed the bra into the growing pile of her uniform and boots, pressing his hands against the breasts that had been revealed beneath them and she writhed a little when he moved his mouth lower and gave attention to each.

Bruce licked and teased until Natasha finally gave him a small but forceful push away. For a moment he thought she was changing her mind until she spoke again, "Pants." One word, spoken in a rather raspy tone, but he understood the meaning. She shoved them the rest of the way down and he kicked them into the pile of her own gear, finally getting a decent view of her in her entirety. It wasn't as though he had never noticed how tiny Natasha was before now, but her lithe frame was certainly a sight to behold in it's unclothed splendor. Before he could continue to soak in the view, she pulled him back to her and ravaged his mouth once again.

It seemed like a horrible thing to use her to release the tension and frustration left behind from his transformation, but she didn't seem to have a single problem with it, and he figured he probably shouldn't either. It wasn't as though she wasn't enjoying it, if the small noises she released on occasion were any indication, and he pressed his hands over her breasts as he pushed her back against the tree.

"Enough, Bruce..." she murmured against his neck.

He watched as she shimmied from her panties as the last barrier stopping them was shoved aside. She proved her point when she reached down and took him in her hand. That was the end of the line for him. Bruce shifted his hands around her until they cupped her bottom and he lifted her up and onto him. Her thighs locked around his waist and he saw her eyes flutter shut while her lips parted a little before she bit a moan into his shoulder.

He moved in an instant with no set pace, but it was faster and rougher than he meant to be and he could feel Natasha's hands move around to his back as she held on. Her fingernails dug into his back in an instant, leaving a ridiculously pleasurable and painful sensation. He had a feeling she was leaving marks, but he wasn't going to complain about that, not after this.

He thought he heard his name in the next throaty little moan but he couldn't really be certain. Bruce pressed his lips against the pulse line on her neck, trying and failing to slow his pace so that she could keep up. Natasha was making an effort to meet his thrusts but he knew that given her position, it wasn't an easy feat and he was a little impressed with what she was managing. She slung one arm around his neck and he had a feeling she was quite literally just hanging on for the ride at this point.

Her breaths came out in little pants as she nipped at his shoulder until one of his thrusts seem to hit the right spot. She gasped a little and he made note of it, moving faster and angling for that same spot. The tiny gasps became more than that, strangled little noises that she was trying not to release because control was everything to her, and she seemed to be losing her grasp on it at this very moment. Admittedly, he was a little proud of that.

Her nails clawed their way into his back again as he pushed into her faster until she just seemed to let it all go. Natasha's body trembled with the latest one and he paused for a moment as she shuttered and caught her breath.

"Shit..." she murmured out as she rested a rather sweaty forehead against his own, "And you're still...?"

Bruce gave her a rather meager nod at that. He put her down on shaky feet and he couldn't hide his surprise when she shoved him onto the ground on his back.

"We're not done," she informed him with that raspy voice.

Natasha didn't give him a chance to disagree before she knelt over him and sank onto him. Her eyes glazed just slightly, likely still reeling from her release just moments ago as she took him in entirely. There was only a small moment where she took another breath, pressed one hand to against chest, and bucked her hips with such speed that made him groan in pleasure. He settled his hands on her waist as she moved without any particular pattern and she only slowed down when he got a hand into her hair and pulled her mouth down to his.

He could feel her trembling already, slowing down to delay her own pleasure and obviously to extend his. Bruce didn't think that was necessary as their tongues collided and he moved faster where she had slowed down. She gasped into his mouth and again he felt her nails, though this time it was as they dug into his chest.

Natasha was clearly trying to mutter out words to slow him down, but instead he moved a little faster until she crumbled again, this time though, he came with her. He blew out shaky breaths as she remained on top of him, her cheek pressed against his shoulder as she panted a little against his skin. She stayed there for a while not moving or speaking, and he wasn't all that sure what to say, even if he thought he could find the will to release some words.

Finally she rolled off him, her back landing rather haphazardly on the ground beside him, resting on the same leafs and twigs that he rested on. "Better?" she finally questioned, her voice a little bit more in control than the last times she had spoken.

Bruce nodded numbly at that as he turned his head to peer over at her, "You have no idea..."

There was a sultry little chuckle she blew out before she spoke again, "I have some idea." And he supposed that was definitely true. "Think that'll happen again?" she asked next.

"Uh..." and all he could think was how embarrassing that would be. This was embarrassing enough now and he covered his face with his hands to hide the flush of his cheeks.

"Well, if it does then I certainly won't complain."Bruce peered through the cracks of his fingers at the saucy little smile she gave him and she looked... satisfied. There was no mask on, no hidden emotions, nothing but a rather satiated Natasha Romanoff as her green eyes stared into his own brown ones. He huffed out a tiny little laugh before he moved his hands and she grinned, "Don't get weird about this, Bruce."

"I'll try," he told her. And he really would, but it would be near impossible to look at her the same way again, not after seeing her naked and completely unmasked. He blew out another breath before he asked the most important question, "How long before anyone starts to wonder about where we are?"

"Probably too late for that," Natasha offered up with a sweaty shrug, "Give me two more minutes to get the feeling back in my legs and I'll come up with something legitimate."

Bruce nodded and smiled a little at that, "Alright..."

"Good luck explaining the scratches on your back though."

He groaned at that, but it was hard to be even a little upset when Natasha released a tiny little laugh in response, and instead he just smiled a little and pulled a leaf out of her hair.

Hope you enjoyed. Mature writing is not my expertise.