Kaleesh were not a species known for being vulnerable, emotional or even kind. Being a powerful warrior, wearing your kills with pride, and carrying strength was more important.  

That was why you had left your home world of Kalee, tired of the same old battles, again and again. There had always been something more pulling at your senses, at your very soul, pulling you out there, into the wide unknown. 

The empire was in its young years when you encountered your first inquisitors, and experienced your first battle with the force. You had believed it magic for a long time, and though you were weaker than them, your many years of experience helped you kill these inquisitors. 

That was how you first met Darth Vader, after making a name for yourself in the galaxy. A Kaleesh who blasted through the stars, looking for the biggest beast to slay, but even you weren't dumb enough to go for Vader. 

At first you were mostly just the preferred bounty hunter of Vader, taking that spot from the skilled Boba Fett. Maybe it was because you reminded him of his past, as Anakin, of Grevious and what once was. 

Your mild force sensitivity made you pleasant to be around too, even if you didn't seem to understand the power you possessed. But how could you have known that Vader could feel your weak force presence, poking at his own, before coiling together like snakes. 

Falling in love had never been in your plans, as a Kaleesh and a warrior. It definitely had not been something Vader thought possible for him, to grow fond of somebody again. The love he felt for you wasn't the same as the one he once carried for Padme, but it was just as strong. 

It was enough to shake the Sith, to the point where he retreated to his fortress on Mustafar, away from everything and everyone, to suffer in his silence and darkness. 

If you hadn't been who you were, maybe you would have left it alone, but that pull in your chest and warriors' spirit, made you fly after him, following the Sith like he was your newest prey. 

Neither of you were ever good with words, so the silence was heavy and charged. In the end, you make the first move, removing the mask your species always wore, exposing your less human face to the being you felt such strange feelings for. 

For Vader, the act of removing his helmet was different, heavy and almost forbidden. But maybe it was the softness you made him feel, even when you were all rough edges and filled with the fire of a warrior. 

Maybe it was a good thing you weren't human, and hadn't been raised around them. It meant you had no opinion or preferences when it came to how humans looked, all you saw was Vader, not the pale, scarred, sad remains of a man. 

Acting on desire, you reach up to cradle his face, movements so careful as Vader wheezed, still assisted by his suit to keep living.  

Vader let out a breathless raspy gasp as your skin met his. He had never realized how sensitive he was, how just the faintest of touch made his entire body tense, his skin tingling almost to the point of burning. 

But like a man stuck in a desert, Vader couldn't help but lean into the touch, his tired, so exhausted and sad looking eyes, sliding shut as tears ran down his pale cheeks. 

Kaleesh didn't cry, so seeing somebody spilling tears was always so fascinating. Normally it only interested you as a way to watch your prey break, but with Vader it felt like more. 

The scent was salty, mixed with the bacta that was regularly applied to Vader's damaged body. Your split tongue flicked out, licking against your bottom lip as Vader outright trembled, near pained quiet noises leaving his lips, his expression twisting into something pained but full of yearning. 

It was like he couldn't control the tears as they started pouring, though Vader didn't sob. His crying was silent, outside of his gasps and breathless rasping. At his sides, Vader's hands trembled, the prosthetics not responding to his wishes as he cried into your hands, his human body parts jolting when your sharp talons brushed against his skin. 

The flames of Mustafar had taken many things for Vader, and one of those things was the parts of his body he had once used for pleasure. All this time, his misery had been so extreme that Vader had felt no need for it. But now, being held by you, sparks of something he had almost forgotten dripping through his body, Vader yearned for them back. 

“Pretty” you mumble, leaning in, unable to resist the allure. Vader finally opened his teary eyes, just in time to catch your long tongue sliding out and lapping against his cheek, sipping up his tears like a delicacy. 

If your hands had been a lot, your tongue was overwhelming. Nobody would believe that a Sith lord like Vader would struggle to stand from just a tongue alone, but he was. His knees buckling, and only holding him to his feet because of the mechanics of the prosthetics. 

Vader hadn't been kissed in so long. And you, you had never kissed anybody. It was so clumsy, uncomfortable and sloppy. Vader was inexperienced and so sensitive that he sobbed as your tongue slid into his mouth. And you kissed like you fought, hungry, all-devouring and dominant. 

Your weak force presence coiled itself around the sun that was Vader and his power, your tiny trickle trying to cover it and squeezing, an instinctual part of you want to show you were here, with him. 

The Sith lords' noises became louder, pained and so breathless you almost pulled back to worry about him. But Vader held you close, the force almost crushing you against him as he sobbed into your kiss, almost blind with overstimulation from touch and kiss alone. 

Vader didn't possess the ability to physically orgasm, not anymore, but he still felt it through the force. It felt more intense than anything he could ever remember experiencing with a body built for it.  

It was so extreme that his legs finally gave out, and you had to scramble to catch him, shuffling awkwardly until you got him pushed against a wall so you two could keep standing. 

You felt so heated yourself, as Vader wheezed, his suit struggling to keep up with the sudden influx of everything, still crying like he had no control. 

Trying to TLDR the AU;

The Jedi find Grievous & his schematics before he's released/activated/whatever, take him prisoner, Obi-Wan is in charge of speaking w him, Grievous is a jerk, eventually softens up as Obi-Wan keeps treating him kindly, emotions for each other, much later down the line Grievous finds orphaned Kaleesh and immediately adopts them... etc

There's a lot more nuance and romantic shit but maybe I'll elaborate some day.

Maybe not.

Enjoy this too maybe