It's been a while, but here's another super sketchy story. This time, I'm going way back to the classic cursed pairing we all know very well: Luke/Leia.
Luke groaned, wiping sweat off of his forehead and brushing his hair away from his blue eyes. His head throbbed from the night of excessive drinking. He didn't remember any of the events leading up to when he woke up, but he could tell that it had been wild just from the sheer intensity of his hangover. Before his vision even became focused on his surroundings, the Jedi could register the heavy feeling of sticky, hot skin on his own bare body. What had he done? That looked like the wallpaper of his sister's bedroom...
Much to his horror, he found the nubile form of Princess Leia draped over him. His twin sister, too, lied very nakedly under the thin blanket that covered their tangled bodies. Luke lifted his head from the pillows, hopeful that he would wake up from this nightmare. No. This nightmare was his new reality.
"Oh no, what the fuck!"
Leia was roused from her slumber by the uneasy movements and panicked cry of her brother. With her eyes still closed, she let out a low hum of satisfaction. Luke quickly pulled the flimsy blanket up to his neck in fear of his own indecency. He was mildly horrified when she nuzzled her head against his left nipple.
"Luke..." she whispered, but not with shame. Leia was proud of her most recent conquest, even though it had been her own kin. Her small, delicate hand found Luke's face and rested there as she tilted her head to stare into his eyes with smoldering passion. Her brown eyes sparkled like embers in the dim light, and her dark locks of long silky hair spilled freely over the pillow beneath her head.
"Leia..." Luke said slowly and uneasily. He was at an honest loss for words. He didn't understand why his sister was staring at him like that and resisted the urge to run out of the room screaming, only because he had to make some sense of everything first. "What happened last night?"
"Well, it doesn't take a Jedi master to realize that we had sex," Leia explained, tracing small circles over Luke's bare chest as if she were an artist and his body was her canvas. He blushed rather noticably at this explicit wording. Of course, he knew right off the bat that 'sex' had happened between the two of them, but he didn't want to confront the truth. No sane person would.
"But- this is so wrong. I should have never been that irresponsible with my drinking. And what about your relationship with Han?" Luke could hear his own heartbeat pounding in his head.
The corners of Leia's plump, pink lips curled up into a devious grin unlike any facial expression she had ever made. Luke started to worry that she might be under the influence of a drug or several.
"What about my relationship with Han?" Her manicured fingers brushed his collarbone. "He doesn't have any problems with my sisterly love for you. Don't you remember? He was watching us the whole time last night, and even joined in a little." She smirked confidently and tossed a lock of brown hair over her shoulder.
Luke felt his stomach drop at this revelation. He swallowed and did another once-over of the room to see if Han would come in and confirm this demented recount that Leia was giving him. He hadn't taken the former smuggler for the kind of man who would watch his woman have sex with someone else, and her own brother no less. A part of him wanted this grim and filthy secret to stay between just him and his sister, because then it would be easier for them to pretend it never happened. But Han apparently knew, and there would be no avoiding the strain put on their dynamics by this drunken lapse in judgment.
The young Jedi knight rubbed at his face. Then he froze, an even more worrying thought surfacing in his aching head. "Did we at least use a contraceptive?"
Leia groaned and sat up to stretch her arms. She didn't answer immediately, peeking under the blanket before scanning the floor for any plastic wrappers. "I don't think either one of us were patient enough to grab a condom... Don't worry, I can always take a morning after pill to prevent an incest baby from being conceived," the Alderaanian princess said with a joking smirk.
"Okay, that's good." Luke relaxed his tense muscles, averting his eyes when his sister slipped out of bed without a single article of clothing on. "I mean, the last thing we'd need after the war is a scandal like this. And the baby would probably come out with flippers, or a second nose or something."
Standing at the dresser across from the foot of the bed, Leia selected a comfortable loose-fitting powder white dress. She chuckled as she pulled the garment over her head and worked her arms through the long sleeves. "That would be pretty awful. Han might be fine with keeping our relationship open, but I think that would be a deal breaker even for him."
Over the next two months that followed, Leia began to experience periodic bouts of sickness that had her fleeing senate meetings to empty her stomach in the nearest refresher. It came as no shock to those closest to her when she took a pregnancy test that came back positive. Han took the news with pride, excited to be a father and start a family with the woman he loved. If the former smuggler had any doubts about that embryo's paternity, he certainly did a good job of masking and suppressing it. However, Luke couldn't shake off the cold sweat and nauseous feelings that washed over him whenever his mind dwelled on the subject for too long.
The timeline would certainly allow for... him to be the father. The father of his own sister's unborn child. Was he going to have a nephew-son or a niece-daughter in seven months?
Luke always pushed the upsetting thoughts back down and rationalized them away. It was only one time, whereas Han and Leia must've knocked boots every day since they officially started their romantic relationship. The odds that Han was the father were so high that he shouldn't have to consider the grotesque alternative of having impregnated his twin during an inebriated one night stand.
Leia herself didn't bring up the clandestine acts she and Luke had committed in bed together, instead carrying on with her political career and continuing to treat Luke like a brother and nothing more. Still, whenever the two force sensitive twins were in the same room, they felt a connection that hadn't been there before. Luke knew Leia also felt it, even as it went unaddressed.
Weeks passed and the bump of her abdomen grew, an ever present reminder that her due date was drawing closer and closer. One day, Luke overheard Han brainstorming possible names for the child with Leia in the Millennium Falcon's cockpit. Hearing their bantering and laughter made him feel like a monster, the guilt that hung over his head keeping him from his routine meditation. He begged for the force to correct the mistake and make Han the father somehow, if he wasn't already. Luke gazed through the viewport in the crew's quarters woefully. Being the fruit of such a sickening union was not a fate he'd wish on anyone, much less the child of his sister and his friend.
Time flew much too quickly for his liking, and before he knew it, he received news that Leia had gone into labor. Somehow he hadn't been able to move past the shock and denial stages in spite of his attempts at healing his mental cracks through meditative exercises. He didn't quite know the limitations of a force ghost's wisdom or whether they had some special insight into the darkest unspoken secrets of the living, but he was glad that neither Obi-Wan Kenobi nor Yoda's spectres had confronted him about his sin against nature.
During the quick flight to Chandrila, Luke told himself that Leia would give birth to a beautiful non-inbred baby. It would be perfect and it had to have inherited a chromosome from the rogueish war hero Han Solo. The palpable connection he felt to Leia was just their natural sibling bond amplified by the force signature of the being inside of her. He rehearsed these things in his mind like a mantra until he arrived at the state of the art medcenter where an entire staff of esteemed medical experts were handling his pregnant sister.
As he stood in the waiting room with Han in anticipation of the baby's arrival, Luke could feel faint echoes of the pain Leia was experiencing on the opposite side of the wall which his eyes were fixed upon. He steadied himself in a waiting room chair and, reaching out to her through the force, offered her his support. If nothing else, he'd take some of her pain away. It was unfair for Leia to endure it all on her own when it had taken the two of them to desecrate the sanctity of their familial bond. He deserved to know how it feels to have his insides ravaged by the ugly side effects of pregnancy, bloated and stretched while his level of pain only escalated.
They remained in close contact with their force signatures entwined for what seemed like a lifetime, until the tension finally broke and the newborn baby made his entry into the world. The depraved world that would almost certainly let him down. A droid emerged from the delivery room to break the news of the unimpeded birth to the princess' brother and husband a short while later. Luke tried his best to conceal his mental and physical exhaustion, forcing a smile to congratulate an excited Han as they made their way into the delivery room.
"I have a son," Han said aloud with a laugh of disbelief. Luke said nothing. He could only stare straight ahead and take calming breaths to keep himself sane. "Obviously I've known this day was going to come sooner or later, but it still feels like I'm not ready for any of this. I mean, what if I'm a shitty dad? What if I screw this kid up and he becomes a mass murderer or something?" Luke stopped in front of the heavy white door and turned to Han, who followed suit. He shook his head with reassuring words to counter the older man's doubt.
"No, don't say that. You're going to be a great father, Han. You're not the same guy you were back when we first met. I've seen the way you've stuck by Leia's side through this whole thing and how much you already love this baby without even seeing or holding him yet." Han rubbed at his forehead, looking from the door to Luke.
"The little man is already taking after his mom's side with all of the force stuff. You really think a regular schmuck like me will be able to keep him safe and meet all of his needs?"
"Hey, I'll have your back," Luke insisted. He hoped his own nerves weren't somehow hurting his friend's confidence in his fathering abilities. He'd already done enough damage to this family before it had its chance to succeed. "I'll be the cool Jedi uncle who gives advice and helps with any force related dilemmas." This was his nephew, not his child. He wasn't the one who'd be taking his first steps on the road to fatherhood. That would be the handsome man to his left who was shooting him a crooked but thankful smile. I don't deserve his thanks, the voice in the back of Luke's head said woefully.
They stepped into the delivery room together, quiet so as not to overwhelm Leia in the wake of her labor. She laid there as beautiful as the day Luke had woken up to find her in his bed, a sick observation that he silently admonished himself for. In her arms was the main star of the show, the small wriggling mass swaddled in a pale blue-green blanket. That was where his eyes needed to be looking, not at her ample cleavage poking out of the low neckline of her hospital gown. A noble Jedi knight shouldn't be jealous of the baby who would be breastfed by his sister. So what did that make him? Scum. Luke inhaled the air which still carried the distinct smell of childbirth. He was made of the same scum as the slavers and criminals who perused brothels on backwater planets, maybe worse. Most of those men at least lusted for women who weren't their kin.
"I think he already has his mother's good looks, if you ask me." Han leaned in for a closer look at the baby, smirking. Leia tilted her head to rest the side of her flushed face against her husband's, though her heavy-lidded gaze strayed to the foot of the bed where Luke stood. The Jedi stiffened in mortification at the words that came from her mouth next.
"I don't know, I actually think he got that from his father," she murmured and gave her own sly, knowing look.
That was his breaking point. Luke couldn't take anymore, feeling his legs give away under him before his vision faded into a haze of spots.
"Yikes, it looks like the process of childbirth was rougher on him than it was on you," Han said in jest before quickly going to Luke's aid. Leia quietly watched him haul her brother's unconscious body off of the floor and settle him into a chair, wondering if she was being selfish. Then her eyes went back to the tender product of her incestuous affair. Yes, it was wrong to push Han into the role of her unwitting cuckold. But she couldn't have ever terminated this pregnancy, and she didn't want to allow one harmless night of passion to end her new marriage.
As she felt one of the baby's hands grope at her chest, Leia only solidified in her conviction to enjoy the best of both worlds. Many high-profile politicians had entire graveyards of skeletons in their closets and would keep those closets locked and barricaded until the heat death of the galaxy with their vast wealth of resources. She wouldn't be the first official in the New Republic's government who had an adulterous secret, either. There was a procedure for hiding these kinds of things from the public.
No one could ever learn the truth of her son's origins. Not even Han. And especially not the boy himself. That much was certain.
I've seen people speculate that Kylo was an inbred love child of Luke and Leia, and that's why he hated his family and wanted to kill them all. I mean, that would be a better explanation for his turn to the dark side than anything in the films.