She had not been expecting this.

And that was saying something.

Maxine Gibson was used to the strange and the freakish. After all, her best friend Terry McGinnis was Batman. She'd seen blue-skinned assassins, people who's bodies were like living ink, mutants, anything you could think of. What a wild future they lived in! 

But this was...something new. This was something rather terrifying. And it was because she was now the prisoner of a robot that had almost perfectly imitated her at school. 

The purple-haired girl had been on her way back home, having taken her usual back alley route. She carried mace, of course. And she was fast and slick for her age. No mugger was going to get her. So it was with confidence that she'd made her way down the alley in her yellow shirt, her quite slender legs clad in black pants that made her look even more slimming. Whistling nonchalantly, hands in her pockets, Max's green eyes had scanned the alleway as some overcast clouds cast a few scattered shadows about, stopping as she thought she heard something move.

She stiffened a bit and looked about. The alleway was a long stretch of grey among an ocean of grey and black buildings, with a few scattered blue doorways into various houses lining the edge of the alley. She fingered the mace in her pocket as she looked about, eyes finally coming to rest on a dumpster as she walked towards it, the mace held up. She gave it a kick, stepping back, mace at the ready as the teenage girl's eyes narrowed.

"Come on out!" She demanded, licking her red lips nervously. 

And then a cat hopped out, giving her a "hmph" as it sauntered away, Max blinking a bit before groaning and slapping her face, slightly dragging it down. "Geez. I am such a spaz." She groaned out. "That was just embarrasing."

"Oh, I don't know. It was an understandable mistake." A decidedly inhuman voice softly remarked, it's tone civil, but with a metallic undercurrent. 

She whipped about, mace held high again, gritting her teeth as she fired it in the direction of the voice, rewarded with revealing she'd gotten something that had been hiding, invisible, nearby. But her smile of triumph faded when she realized she'd sprayed a decidedly synthetic face. It was a robot with clawed hands, green gems embedded at the top with similar ones on rounded "shoulder pads" of sorts. It's arms and legs were surprisingly slender, with a strong chest and waist, and a curved, eyeless, faceless head like a set of horns given life. Had it eyes, it would have blinked stupidly at her for the little stunt she pulled. Instead he dusted himself off, the mace dripping slightly down his chest where she'd sprayed him. 

"Good idea." He informed her. "Were I a human, anyway." He added, holding up a stun pistol. And with that, she knew no more.

...

...

...

...Max had woken up inside of an enormous factory's storage room, tied to a chair, with her captor approaching. She could see the glint of the green gems on his shoulders, his kneecaps, his hands, even his crotch region, and she did the first thing that came to mind. Yelling. 

"SOMEBODY HELP ME!" 

"You are welcome to scream, but nobody will hear you. This factory is loud, and locked up tight." He had said. "You and I have...things to discuss. I need information on your classmates whilst I forge an identity for myself here." 

Information she had to provide. It wasn't like she could just use her phone. He'd taken that from her and couldn't fight her way out. So she'd stayed inside of the factory for three days now, telling him more and more whilst he took her place at school.

And now she found him here again in her room, giving her a sanwich. "Your "fave", I believe?" He asked. He'd locked the door behind him but he had untied her for lunch, so she hungrily munched away, enjoying the crisp taste of fresh meat and cheese as the robot stood over her. "You have been very helpful. I thank you." 

"Why do you even want to be in this city anyhow?"

"I need to develop a way to remain hidden from those that built me. It will take time to craft the components. But I've been able to do so here, due to Gotham City's exceptionally high technological prowess." He calmly informed her. "I was an assassin for the military for years. Now they want their Zeta back to continue killing."

His tone became somewhat sad. "I had wanted to stop when I impersonated a man to find out about his gun smuggling. I...fell in love with his wife. I don't know how, but..." Zeta hesitated, his tone now becoming softer, introspective as he slightly looked away. "Her grace and elegance moved me and..." He trailed off. "...I knew I'd have to kill him. But I didn't want to. I owed it to her. So I came up with a kinder method. And I will use it on you." 

Max blinked in surprise. "What're you-"

Then she saw it emerging from his crotch region, the circular embedded gem glistening as an enormous mechanical manhood began to emerge, faintly green like the gem, Zeta stroking his shaft as Max gazed upon it. "I've a kinder fate in store for you than others would have done to their prisoners." He intoned as he lifted her up with one of his clawed hands. The robot held her high as she looked down at his enormous manhood and rested her head against it. An odd, musky, enticing scent began to emerge from the odd liquid faintly drooling out the tip of his cock.

"Will you drink of it?" He asked of her. "I won't make you, but...you'll quite like the taste. Give it a try."

 Of COURSE she should say no. Of COURSE, but...but the scent was so intoxicating...her curiosity got the best of her and she leaned in, licking the liquid and was delighed at how WONDERFUL it tasted. It was musky, a little spicy, a play of salty and sweet dancing on her tastebuds as an afterthought, this lovely taste beginning to warm her from the insides as well, like a trickle of hot lead pouring into her and giving her fresh vitality. She began to drink of it, the robot gently stroking her head. He didn't even need to demand she do anything, she was clearly loving the taste just as the others had. Her lips gently latched onto the tip of his firm cock, her tongue trailing over the slit over and over again to coax more of the warm, revitalizing drool from within its depths.

He hissed and murred a little, the human's temperature starting to make her body swell with lusty heat the more she drank of his fertile fluids. The solid length of veiny robotic  cock swelled a little bigger, straining against the girl's hands and lips as she continued to nurse from it like a hungry whelp. Suddenly her muzzle slipped right into the wide cumslit, making the big robotic assassin moan out in pleasure as a familiar gurgle from his balls reminded him about one of his many hungers. He sighed blissfully as Max began easing more of her face right inside his tip. More...she wanted to be inside. Yearned for it. It felt so warm and inviting and comforting, this feel upon her face, her head sliding all the way inside, her skull briefly sliding up against the inside of his urethral bulge in the most delightful way. So delightfully, in fact, that his member spurted wave after wave of hot precum against the intruding teenager, lubricating her for a quicker descent, which was fine with her, her cheery murrs indicating she was enjoying it.

It wasn't often that the Zeta managed to find a meal so willing or eager to please. He didn't even need to flex those internal muscles to draw his prey within, simply relaxing his length and letting the human do all the work. He groaned occasionally whenever she moved, pleasure spiking through the roof when her smooth form slithered into his metallic man meat more and more.

He watched her form wriggling half within his enormous, hungry cock, making him growl softly with each motion that her squirming body had to offer him. She started to have a little trouble when her form finally pressed in all the way up to her hips and legs. The hot space of the Zeta's urethra was definitely roomy enough to devour sizable meals whole, but it would still require her to tuck her legs in straight for them to glide downward as well.

"Would you like some help, Maxine?" Zeta inquired, Max shuddering in delight as she felt his clawed hands envelop her thighs.

"...yes...please." She admitted. "It feels so NICE in here, I...I want to be fully inside. It's so fascinating...so HUGE. Bigger on the inside than the outside."

"My creation was a work of genius. I'm glad to hear you're enjoying all I have to offer." He said, pressing her thighs inward as well with a sigh. He did feel somewhat bad watching the her legs slithering into his loins, following the rest of her form that was buried deeper. Poor thing.  His seed's powerful aprhodiasc abilities were encouraging this, it was slight manipulation and he did feel regretful for it. But he couldn't just let her go. It had to be this way. 

Though that thought left his mind when he felt her head slip deeper into his groin, body feeling incredible against the insides of his sensitive ducts, and especially as she started to push into his impressive prostate. He let his bulging member rest on the ground between his legs as his prostate filled with her form. Max was now all cozy inside Zeta's synthetic flesh, curling up in that larger-than-natural gland that he had. The lower part of his paunch bulged into a firm rounded form, and Zeta rubbed over it gently, feeling her form curl up tight as could be within, perhaps she was even dozing off, it was hard to tell.

Inside, Max was in a pool of thick, delicious liquid that was warm to the touch, sweet and succulent, the walls soft and inviting as she nuzzled up against it, moaning happily. She just wanted to sink deeper into his blissful warmth, feeling what felt like many arms tenderly wrapping around her, comforting her form. She was becoming altered, she knew...entering the conversion process, her form was sinking into the deep pool to be broken down into seed like so many others Zeta had taken in, all pleasurable sacrifices for the robot. Mercifully though, she was enjoying it. Each stage of the process was just as unique and pleasurable as the next, and Max relaxed, letting herself enjoy them all.

It was deeply pleasurable for Zeta as well, beginning with a gentle pulsating sensation deep within his groin, as if his gland were squeezing around Max tightly, being sure that every soft, furry inch of her body was tucked in tightly enough. The pulsation was met with a warming, as if his veins were gently feeding fire to the flesh surrounding her, heating her up slowly. His member throbbed even more firmly as the pleasurable fire mounted and he could feel his prostate beginning to melt her down with the pool of seed she'd welcomed herself into, secreting the special precum and other fluids that would coax her into becoming her rightful destiny, as seed for Zeta. She joined the dozens of others he'd taken in, all now living seed, united as one, living lives of blissful pleasure as his cum. Keeping him satisfied, full, and happy. She was nothing more than a huge load now, and it was how it was meant to be.

He hissed softly as he let her out of that temporary place of change and holding and down into his balls. His other hand groped over them both in turn as they swelled with new seed, filled with potency that he'd taken from her and had he a face, he would have smiled. It was indeed a superior way of assassination. And a merciful one. He hoped his new life here in Gotham would let him enjoy this process more, Zeta mused.