Author's Notes: This is a collection of Marvel and DC crossover smuts. Some of the couples may make sense to you, some may not. Why not give them a chance and see if you think they work or not then let me know in the reviews. Feel free to tell who you'd like to see in future chapters maybe. All goes well, I'm considering doing some spin-off stories about the couples in here, following straight on from the chapters, depending on which ones I like the most, and which have potential for further stories. Haven't decided whether they will be later chapters of this or new stories. What do you think? But anyway, here is Nightwing and Black Widow.

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"Need some help?" Nightwing hung from the ceiling a grin for his face. "No," Black Widow stated as her Widow's Sting took down the last of the green-clad terrorists. "So what brings a big shot Avenger like yourself to Gotham City," Nightwing dropped down, landing on his feet with acrobatic poise. "I'm here on official shield business," Natasha was trying to be short and get this over with but the look on the vigilante's face told her he wanted more explanation. "There are several Hydra bases hidden in Gotham, being financed by the Penguin."

"Fair enough," Dick grinned with a shrug. He made no effort to leave. "Why are you bothering me?" Black Widow demanded after a moment's silence. "I really like redheads," he shrugged. She sighed. Natasha was used to men drooling over her but this was different. This was more like genuine flirting. And Nightwing was cute. "Alright," she said after a moment's pause, "I could use your help with the final hydra base."

With the final Hydra facility destroyed and any weapons of mass destruction secured, and after a visit to the Penguin, Widow's job in Gotham was finished. But she still had some time to kill before her flight. It was only fair she give Nightwing a helping hand with his own criminals. Within an hour, Killer Croc was imprisoned again, Firefly's latest crime spree had been ended, and Killer Moth was dangling from a rooftop defeated.

"So he's really a supervillain?" Widow asked. Nightwing nodded. "And he calls himself Killer Moth?" "Yup." "... and his moth-gun?" Nightwing grinned at her disbelief. Then something took over him and he found himself leaning towards her. Natasha was apparently feeling the same thing because her eyes fluttered shut and she leaned forwards too. Their lips connected in a kiss for just a moment before they pulled away. Natasha turned away, embarrassed, and Dick blushed.

"It's getting early now, it's time for the nocturnal members of the Gotham population to head home." Widow nodded her understanding. "Do you live far from here?" He shook his head.

His apartment was only a few blocks away. Dick discarded his mask, which surprised Natasha who expected him to be more protective of his identity. Clearly Nightwing was more trusting than his mentor. "Listen," Black Widow said nervously, "that kiss..." She stepped towards him. "Let's just forget it ever happened," Dick finished for her. Natasha shook her head and kissed him: "Let's not."

Dick's eyes widened but his grin returned as his arms wrapped around her waist, pulling her to him for another kiss. Their lips worked at each other's with passion and precision. Natasha rolled off his top revealing a toned and muscled chest. His fingers weaved into her belt, unclicking it and tossing it away.

They backed up against the wall, Dick's back pressing against the solid surface of his apartment wall. He caught the zipper of her black leather costume and tugged it down. He pushed the black fabric off her shoulders and spun her away from him. His hands gripped her breasts through her bra while his lips lay kisses on her neck evoking a deep moan.

Widow allowed him to gently rub her boobs as he nibbled and sucked on her neck. His tongue breezed over a few strands of her red hair. She turned herself around to face him again, pushing her into the wall forcefully and ripping away the rest of his costume. He grinned eagerly as she pushed off the straps of her bra. It fell to the floor.

The retreated away from the wall and into his bedroom where he stripped her down to her thin panties and laid her down gently on his bed. She pulled down his boxers swiftly and his penis pressed against her bare thigh. He pinched her panties and carefully took them off her smooth perfect body. They positioned themselves on the bed with him on top of her and his hips started to rock against hers.

His cock slid into her vagina and pushed back and forth. Natasha moaned out and he silenced her with a kiss. His short black hair smelt good and her hands disappeared into it, holding on tightly as they made love. Their breaths were short and fast. He coated her naked body with kisses as he thrust into her.

His pounding grinded to a halt as they tensed up. He finished in her and she called out lustfully. She rolled him onto his back and pushed herself tightly to his chest lovingly, hearing his heartbeat as her ear pressed against his chest. Her nimble hands rubbed his shoulders lovingly. "Mission accomplished?" he grinned. "You bet, lover boy," she whispered.

His arms wrapped around her shoulders as she snuggled into him. "Shield could use a man of your... talents," Natasha smirked. He smiled back. "I didn't realise Shield was so into cuddling," he grinned.