"They can't help it. It's in their DNA."

A sasusaku AU. Includes smut & cursing. Alien Sasuke & human scientist Sakura. Intent to unknowingly impregnate. You have been warned!

(A slight summary will be at the end to try and explain the idea behind this. If you want me to continue, please let me know! Or if you would like for me to try & explain further or have any other questions, feel free to comment with those as well! All I ask is that you please be kind. 🙏)

"They can't help it, it's in their DNA."

"Which we can take full advantage of, can we not?"

"Exactly. Well said, Hayashi."

He remained speechless as they continued, but his hands balling into tight fists at his sides. He was sent to observe and learn about the creatures on Earth; it wasn't meant to go this far or to be this way.

How could they expect him to— after he's grown so fond of the creatures (especially her) too.

'Those are very human emotions, Uchiha. NOT ours. Our kind feels nothing. We simply exist.' The lead commanders would surely reprimand him if he even thought to open his mouth to voice his opinions (his family had always been a little different from the others), so instead he bit his tongue and stared diligently, emotionless ahead; silently observing and listening once again as they continued.

"It's one of the many, many advantages of taking this form actually. They would be none-the-wiser of our deceit… and we would be long gone…with our heirs in tow…by the time they realized anything was truly amiss. And with no way of knowing what we are… or what happened, we would have no further issues with them or use for them. Except maybe some of the females of course. For breeding purposes, you know." Several of the men laughed at this, the women just rolled their eyes flamboyantly.

"These humans really are just simple and vulgar creatures, aren't they?" Several nods followed Hayashi's statement. 'Not ALL of them are simple or vulgar,' the dark-haired one thought, but again decided to hold his tongue on the issue as several sets of eyes suddenly fell upon him.

The being in charge finally stood from his chair, his voice deep as he commanded the room to listen… commanded Sasuke and his battalion. "Now, do as you are told. To hell with these human women's feelings," he growled…as if he could somehow sense the direction of Sasuke's thoughts.

And maybe he could somehow. That could be one of his… powers. There was no way of truly knowing unless he told you them or was somehow forced to reveal them instead.

"Our entire species depends on this, depends on you all to survive and fulfill our request. That's an order. Understood, Uchiha?"

Reluctantly (and with great hesitation) he nodded.

.

.

.

The moment was replayed over and over in his mind as he heard the sounds of the shower turning off behind him. He lifted a glass of unknown liquid to his lips and took a large sip from it, his pitch-black eyes scanning the far-off horizon as the brilliant sunlight finally descended past the farthest point, bringing to life the bustling city underneath him.

The glass balcony almost seemed to dance from the lights emanating from down below and Sasuke listened carefully as the multitude of humans beneath him began to stir and move about, vehicles honking impatiently, and the woman still in the bathroom behind him began to hum some 'god awful' tune that he couldn't quite decipher the origins of.

Sometimes, Sasuke wished to damn his sensitive hearing to another dimension.

Unexpectedly, he heard the voice of his best friend in his mind and as he listened, he took another sip of his drink. "Are we still on for tonight?"

Finally, he replied. "No."

It only took a second for the idiot to respond, and the voice was practically ragging at him at that point. He knew that if Naruto had been physically in front of him, he surely would have grabbed the front of Sasuke's shirt and/or shaken an angry fist in his face. He smirked to himself as he listened.

"Come on, Sasuke. We can't keep putting this off. It has to be done and you know it. The counsel is getting restless. If we don't start producing some results, they will make a trip to see what's going on… and you don't want that do you?"

No, no he did not.

His hand tightened on the glass in it as he downed the last of his drink before throwing it in frustration against the wall. As expected, with most human modifications, it was fragile and shattered on impact sending a spray of broken shards of glass all over the balcony floor. Sasuke watched as one piece in particular did a full circle, before finally landing on its face. He frowned. Why? Why did his stupid race decide to implement something like this and why in the hell did he of all people even have to get involved. He was perfectly content to just observe… as was his previous task. Not—

"Your genes are invaluable, my guy. You have some of the strongest known powers of our kind… not to mention your looks and bloodline… it's a no brainer really…," the idiot's voice in his head stated, and Sasuke rolled his eyes while leaning over the balcony's railing to watch as a few people ran past his building in a rush to reach their destinations.

"Are no thoughts private any longer…," he teased. Naruto scoffed inside his mind and Sasuke smirked a little at his indignant (and very human-like) behavior.

"Sorry, I thought you were asking me."

He heard the soft click from the bathroom door and felt her eyes land on him when she exited…but he remained firmly in place, his strong grip on the balcony's railing firm as she advanced. But surprisingly she didn't come to him (like she usually did) and he listened as her feet progressed, before the soft, barely audible sounds of fabric and slight creaking of a bed frame reached him. She went to their bed instead and he felt his throat tighten for an unknown reason as his decision was made. He had no choice after all, despite his feelings— if he wanted to keep her safe that is.

And he did.

She was silent as she observed him and he felt the telling tingle start at the very base of his hairline before it receded downward, towards his—

"So, when do we start then? Because you know it takes a while to—"

"Tonight," he growled through their telepathic connection.

"Sasuke-kun?" There it was, the tinkling sweetness of her voice that caused his previously dead heart to race. He felt his body harden, tensing as she shifted on their sheets. He could picture it in his mind; Sakura Haruno, with her damp petal-pink locks trailing down her back, clad in nothing but a flimsy towel (or if he was lucky, her silky-red robe) sitting seductively in the middle of the mattress, her dark lashes shielding her eyes slightly as she gave him a wicked grin. He took a deep breath to steady himself. "Come to bed?"

Hell yes he was coming to bed, right after he got rid of the damn idiot who was continuing to speak despite the racing turmoil tumbling like a vicious tornado in Sasuke's guts.

"Are you sure tonight is the right time? I mean, I think we still have about a month or so before—"

"I said tonight! Tell the others."

He severed the connection quickly thereafter… in no mood to hear any further complaints from the blonde…and finally turned to observe the pinkette, sitting just as he had hoped she would be in their bed; her bathrobe hanging loosely on her shoulders and exposing the top expanse of the creamy swell of her breasts. His eyes lingered there briefly, before meeting hers.

"Come to bed, Sasuke-kun…," she asked again, her voice almost a whisper of seduction that without his provocation involved an almost instantaneous response from his body. Sasuke swallowed hard before silently approaching her.

He would deal with the broken shards of glass later.

As soon as he was within arm's reach Sakura rose up onto her knees and wrapped her arms loosely around his neck; their lips locking while his hands moved to her hips.

He pushed into her, pressing her back against the delicate pristine sheets gently as he simultaneously climbed on top of her to settle between her legs. They slowly lifted to wrap around his back while his large hands roaming underneath the soft and thin fabric of her robe, his hot tongue prodded at the seam of her lips.

She opened for him on a soft sigh and their tongues began to dance between them as dexterous, thin fingers explored exposed flesh. His chest muscles flexed beneath her light touch and pushed down on her, his body aching for more.

Clothing slipped away easily… not that there was much to begin with…and soon he found their positions shifted, with Sakura straddling his hips as she strategically ground her own against him. He held her jaw with one hand while the other was firmly planted on her ass cheek… pushing and pulling her up and down as his cock slipped in and out of her slick folds.

But it wasn't nearly enough. He needed more.

Sasuke maneuvered her into position above him carefully, angling his hips up just enough to slide the tip of his cock in on the next gentle thrust. She shakily breathed against his lips when she felt him enter her heat, a small whimper escaping her lips as he halted her movements… hindering and rendering her incapable of moving against him… for a brief period of time. When her sharp nails dug deeply into his left shoulder and scalp, he finally chose that moment to move.

With a practiced ease he lifted his hips, using the balls of his feet to angle himself slightly before his muscular legs pushed him further, thrusting into her cunt slowly. She let out a shaky breath again, but this time it combined with a heady groan when he seated himself fully within her tight core. The sound sent an unexpected jolt through his entire bloodstream and Sasuke had to forcefully restrain himself from railing into her too roughly. He knew his strength and he also knew that she was one-hundred percent human. If he was to lose himself fully to passion… he feared he may unintentionally cause harm to her fragile, human body.

So instead, he let her set the pace. Let her rock her hips in a way that pleased her most while at the same time pulling away from her tempting and plump "kiss-swollen" mouth to watch (almost dazedly) as her breasts bounced with each thrust, her nails digging into his chest as she slowly leaned up and then back, her hair spilling down her back while her bangs clung to her damp forehead. Her eyes were shut as her head tilted towards the high ceiling…her lips parted on soft, feminine mews, and her body shook as she used him for her own pleasure. It was the most erotic thing he had ever seen and he bit his cheek, causing the salty, metallic tang of blood to cover his tastebuds as she whispered his name affectionately.

"Sasuke-kun."

He swallowed his own throaty moan and moved his hands to either hip, using them to help guide her… help press her down just enough to cause her sensitive clit to rub against him with each pass of her hips. Her cries grew louder and more intense… an almost painful sound for him due to his enhanced hearing… but one that spurred him onwards. He swallowed and closed his eyes as he felt himself grow stiff beneath her. He really didn't want to do what he did next… truly, for it went against his beliefs… but he had no choice.

He had to do it. Otherwise— otherwise the consequences for her would be too ghastly to even consider and he could not (no… would not)fathom losing her due to his rebellion against his kin. He couldn't even think about what his own kind would do to Sakura just to get back at him if he didn't follow through with their plans. Sasuke opened his eyes to see her looking down at him through hooded ones…desire evident in the depths of her dark irises. He reached up and pulled her down for a kiss, twisting them around so that he was now on top of her.

He picked up the pace, eager to reach climax and brushed a fingertip down the length of her stomach until he reached her tender clit, while the other hand held her firmly by the hair, keeping her from moving even an inch away from his heated kisses. He tried to push away the thoughts of how she would feel after he did what he was about to do and focused instead on her and how she was feeling right now instead. He could tell by the way her body reacted to his touch that she was keen to reach her euphoria as well and applied just a little bit more pressure onto her clit, sending her over the edge mere seconds after.

"SASUKE-KUN!"

She sang his name like a prayer and he removed his lips from her mouth to trace a line down to the soft column of her throat. She didn't seem to be paying much heed to his actions, which he was secretly grateful for, and he pushed himself into her a few more times before darkness claimed his vision briefly then exploded into a kaleidoscope of vivid colors…his low groan of pleasure ringing loudly in his own ears as her breath fanned quickly against his neck.

Sasuke felt his bulbous tip thicken and then expand as he injected her with his milky seed… spreading her walls and painting them a brilliant white… all the while she remained unaware. He felt the guilt begin to creep up on him as she began to wiggle beneath him, but he held fast, knowing he wouldn't be able to part from her so quickly— not right now at least.

"Sasuke-kun," Sakura whimpered, rubbing his back slightly as she pressed up against him, her silent attempt at letting him know that she wanted to get up. "Please, I want to…"

"Not yet," he practically growled at her, before swallowing. He took a deep breath, then attempted to appease her as she stiffened slightly beneath him. "Please. Just—"

She pulled his head against her chest and relaxed against the tangled sheets… running her fingers through his damp hair, while the other simultaneously brushed lightly against the slick skin of his back. He was thankful that she at least seemed to understand his need to remain, but he also felt the guilt nearly cripple him now as he waited anxiously for the swelling in his tip to go down. He held onto her, looking up to see a serene expression on her face, her pink hair a tangled mess on the skewed pillows, and her eyes closed in obvious contentment.

Sasuke cursed all of the gods above for every damn thing he was putting her through. This beautiful, intelligent, and selfless woman deserved the world and he— well, he had just demolished any chance that she would have had at a normal and bright future.

He should have just left her alone on that fateful night.

Maybe things would have worked out differently. Maybe he wouldn't have ended up with Sakura and maybe he would have condemned some other unsuspecting woman to this fate. But would he have been happy with another? Would Sasuke have grown to understand humans in a completely different way if he did; would he have grown to understand and know and feel the emotion called love?

'Probably not,' he thought. If he hadn't met Sakura on that night, he doesn't believe that much about him would have changed. He would still be just like his predecessors… he wouldn't have the same 'superiority complex' (as his family taught him better) but still… he wouldn't be able to feel the crushing guilt, the joy he knew when he saw her smile, the envy he felt when she turned that smile to another, nor the immense and undeniable affection that he felt in his heart for this beautiful creature lying beneath him; unsuspecting of the tumbling emotions and wayward thoughts currently swirling rapidly around inside of his brain.

Finally, he felt his tip receding and Sakura unconsciously shivered beneath him at the feel of him sliding out of her. When he leaned up and found that she was watching him, he reached a single hand up to cup her cheek, brushing a thumb against her jawline tenderly.

"I didn't hurt you, did I?"

"No," she stated instantly, though her lips curved up into a soft smile. "Although, I'm ready to get up. I need a shower, again. I feel sweaty and sticky…," she giggled and pushed on his shoulders. Sasuke didn't resist this time and moved back for her, his body tingling where she touched him, and he watched closely and silently as she sauntered her way to the attached bath before turning to him. Sakura's vibrant greens lingered on him briefly… before she turned around again, though she said over her sounder, "You're welcome to join me… if you want to that is."

His lips twisted. How could he resist such a suggestion?

Later that night, he held her close as she slept… his arms wrapped securely around her frame, while his gaze fixated on a constellation shining brightly beyond the thick glass of their balcony's now closed doors.

On one particular star.

He felt his chest tighten as he closed his eyes, focusing on his breathing to slow it, before reopening them once more. Vivid crimson shone brightly in place of the usual onyx and he focused his attention once again on the little 'star' while seemingly spearing it in place. It took a moment for him to fully concentrate on his task, but when he had… he felt the deep connection between him and his kin grow stronger… the pull of his homeland stronger than ever before.

"Itachi."

"Brother, do you have news?"

"Yes. Tell them it's done."

"Are you sure?"

"Yes."

"You know what this means right? For you and for her?"

"I do."

"Are you okay?" Silence. "It's okay to—"

"Itachi, have you ever been in love before?"

Pause. "I have."

"Then you understand what I must do."

Pause. "I will stand by you. But know this… they will NOT stop until they find her. And when they do, there is nothing you can do to stop them from taking—"

"I won't let them find her." Another long pause.

"… okay. I'll tell them and keep you updated. I will stall them for as long as I can. Keep in touch little brother. I— we all miss you."

"I miss you all too. I'll talk to you soon."

After his conversation with Itachi, Sasuke connected with Naruto to inquire if he had "done-the-deed". When he was finished, the Uchiha felt the strain on his eyes deepen as small drops of blood began to seep from the corners of his vision. He blinked rapidly, before closing his eyes. Cursing under his breath, Sasuke willed himself to relax and after he had control over himself once more, he opened them… and thankfully they were no longer crimson…but the deep, dark, blissful abysses that normally shone proudly within.

Sasuke bent his head to gaze down at the pinkette once his eyes had eventually adjusted and a soft smile played on his lips. He tightened his hold, lifting a hand to rest it on her jawline while he brushed his thumb across her slightly parted lips. She stirred next to him and he paused as she scooted closer to him, until Sakura was plastered against his side, propping her left leg across his right thigh and her hand resting just above his racing heart.

He wished it could always be like this, with Sakura by his side in a stage of satisfaction and pure bliss… but alas, he knew all too well what he had damned them to and felt his chest tighten anew as a sigh of despondent resignation fell upon him. He leaned over to brush the top of her forehead with his lips before tucking her head against his throat.

As he closed his eyes, he let out a soft sigh and then he whispered into the night, "I'm so sorry, Sakura."

Somewhat of a Summary:

So basically, the idea behind this is that the alien race as a whole doesn't think highly of humans but somehow Sakura has changed Sasuke's mind. His kind is going extinct, their females no longer fertile & humans are the closest species to them, so they plan to use them to revive their kind.

Sasuke thinks that if he impregnates his lover, he will save her from being captured by his kind… but when one of his clan grows interested in her specifically & plans to kidnap her along with his kind wanting to run experiments on her after learning of her newfound "abilities", he plans on doing it first to try and save them… himself, her and their unborn baby.