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Biological Imperative	By : GeorgeGlass Category: +G through L > Lilo and Stitch Views: 43392 -:- Recommendations : 4 -:- Currently Reading : 2
Disclaimer: I do not own Lilo & Stitch or its characters. I made no money from writing this story.

Chapter List
- 4
- 5
- 6
Chapter 5
Stitch fucked Lilo every night for the next three nights. Each time, Lilo found the experience less painful and more pleasurable, but she still felt a kind of deep embarrassment at letting Stitch use her body that way, use her that way. And she found it strange that her bed, which Nani had begun making daily with new sheets, now had one of those plastic covers between the bottom sheet and the mattress, like she’d had years ago when she was still having the occasional “accident” in bed.
The morning after the third night, Lilo was awakened by retching sounds coming from the bathroom. She got out of her bed, where Stitch was still sleeping, and toddled down the hall to find her sister in the bathroom, kneeling in front of the toilet.
“Nani, are you okay?” Lilo asked.
Nani grabbed a washcloth and wiped her mouth with it.
“I’m fine,” she groaned. “It…must be something I ate yesterday.”
***
That night, Stitch didn’t climb into bed with Lilo as usual to play with her boobs and tell her to spread her legs. (She couldn’t think of them as “booblets” anymore, now that they were as big as those of some of the teenagers Lilo saw regularly on the beach.) In fact, Stitch didn’t come to her bedroom at all. That was odd, because Stitch almost always slept in Lilo’s bed, sex or no sex.
Curious, Lilo tiptoed down the hall, wondering if Stitch had gone to Nani’s room. It seemed that he had, because she heard voices through the door.
“You lied to me,” Nani was saying. Even through the bedroom door, her fear and anger were audible. “You told me that you were…that you were fucking me so you wouldn’t have to fuck Lilo. But now you’re doing it anyway.”
Nani had waited days to say these words to Stitch. Three nights ago, when she’d been drawn to Lilo’s bedroom door by the younger girl’s screams, a part of Nani had wanted to burst in and pull Stitch off her little sister. But she’d been afraid that startling Stitch when he was physically entwined with Lilo would cause him to injure her—accidentally or otherwise.
After that, Nani had mulled over and over the question of whether there would be any point in confronting Stitch. And her guilt over her fear and indecision had grown night after night as she listened to the sounds of the alien intruder violating the innocent child whom Nani was charged with protecting.
“Stitch didn’t know he would have to fuck Lilo too,” the blue alien replied matter-of-factly. “But it okay. Lilo like it. Just like Nani like it.”
Nani didn’t respond. So after a moment, Stitch continued, “Now, Nani take off sleep-clothes. We do different way this time.”
Lilo peered through the crack in the door just in time to see Nani’s brow furrow as she said, “Different how?”
“Last time, Stitch put one cock in one hole. This time, Stitch put two cocks in two holes.”
Nani’s eyes went big as she gasped, “Wait, you mean-?”
She stopped herself, then shook her head rapidly. “No. No, I won’t do that.”
“Nani must do. Take off clothes and get on hands and knees like doggy. Nani will like.”
“No!”
As Stitch moved toward her, Nani leaped off of her bed and tried to run around him to get to the door. But although Stitch was only half Nani’s size, he had more than twice her body mass and many times her strength; this enabled him to leap sideways, seize her ankle, and send her toppling to the floor. Then he leaped onto Nani’s back and used two of his hands to pin the teenager’s arms behind her back.
Thinking of nothing except protecting her sister, Lilo burst into the room and charged at Stitch, her arms outstretched to grab him. Stitch saw the sudden movement out of the corner of his eye and reflexively backhanded Lilo with one of his free arms. His hand struck the side of the girl’s face with a loud smack and sent Lilo sprawling into a corner of the room, barely conscious.
Stitch was suddenly aflame with anger, but this emotion did not displace his lust in the least. If anything, it only seemed to intensify his need to fuck Nani, to shove his cocks into her to show her that she was his to fuck, and that resisting him was worse than useless.
With his two free hands, Stitch grabbed the neck of Nani’s nightgown and tore the garment open all the way down to the hem, leaving Nani effectively naked except for her underwear. Then Stitch snatched at her plain white panties with one clawed hand and rent them such that they lay in tatters around her hips.
“Good,” Stitch snarled, looking hungrily at Nani’s bare ass. His two cocks were painfully hard now, and precum leaked copiously from them, making the heads shiny-slick.
Stitch’s hands slid down to Nani’s wrists. To Nani, his grip felt as steely as a pair of handcuffs, and no easier to break free from. Then Stitch got behind her and pulled her up onto all fours.
The next thing she felt was the head of his lower cock spreading open her pussylips as the upper cock pressed against her virgin anus.
“No!” Nani screamed. “Stitch, please, don’t!”
The words only made Stitch angrier. With his two free hands, he grabbed hold of Nani’s ass, his fingers digging in hard, and shoved his cocks into the teenager’s defenseless holes.
“AAAAAAAAAAAAHHHHHHHHH!” Nani screamed, as though she were being murdered. The forcible penetration of Stitch’s thick cock into her virgin anus certainly made her feel like she was.
Mindlessly, she tried to crawl away with her knees alone, but Stitch’s powerful grip on her wrists and ass kept her from moving even an inch forward.
Stitch forced himself farther in, the sheer pleasure of sinking both his cocks into Nani’s holes sharing space in his mind with his rage. And the moment he hit bottom, his lower cockhead pressing hard against Nani’s cervix as his lower member stretched her newly deflowered asshole wide, he started fucking her hard and fast.
Nani let out a series of yelping screams, one each time Stitch’s hips slammed into her ass, making it jiggle in rapid rhythm. There was no pleasure for her this time—just the agony of the forcible anal penetration stretching her so wide and hurting her so deeply, and the humiliation of being violated so completely.
This, THIS was what Stitch had needed all along—this total penetration, with both his cocks pumping simultaneously in Nani’s pussy and ass. He’d thought he’d experienced pure pleasure before, but the joys of single penetration paled compared to what he was feeling now. He would never fuck Nani with just one cock ever again.
“Yes,” Stitch growled pumping her hard. “Yes, yes, yessssss!”
He shoved his cocks deep into Nani’s holes, making the teenager cry out one last time. His clawed fingers gripped her tan ass hard, keeping her from moving in the slightest as he fired his double load into her womb and bowels.
Nani moaned and whimpered as Stitch’s cum filled and filled her, to the point where she could actually feel the place inside her where her distended womb and her overfull intestines pressed against each other through their shared wall. It felt as though he’d filled her entire body with his seed. She’d always loved her body and treated it well, but now it felt like nothing more than a bloated sack whose only purpose was to be filled with her alien master’s thick, endless semen.
When he finished, Stitch kept his cocks hilted inside Nani’s holes. The teenager’s belly hung heavy beneath her, which brought a toothy smile to the blue alien’s face. Since he had begun using Lilo and Nani to slake his breeding instincts, Stitch had found that the loads of semen that built up inside him were becoming increasingly voluminous. And shooting more seed meant that his pleasure lasted longer.
“Never say no to Stitch again,” he explained.
He didn’t feel angry anymore, but he knew he had to be firm with Nani to keep something like this from happening again. And not just with Nani.
Stitch pulled his cocks out of the teenager, causing semen to positively gush from both of her holes. She moaned in both relief and humiliation.
After as much of Stitch’s cum had poured from her body as was going to, soaking deeply into the rug, Nani opened her eyes and saw Lilo, still lying in the corner. The girl was conscious, but not fully so; she moaned faintly and moved only slightly where she lay in the corner, on the bare wooden floor just beyond the edge of the oval-shaped rug.
Although every part of Nani from the waist down ached, or burned, she made a feeble effort to crawl over to Lilo. Stitch raised a hand to stop her.
“Nani stay there,” he said. “Lilo fine. Nani stay still and watch.”
Stitch’s clawed hand raked downward in a flash, rending Lilo’s nightgown from neck to hem like Nani’s. He slashed again, and the girl’s white panties fell in shreds around Lilo’s now-bare hips, also like Nani’s. Nani had a disconnected, back-of-mind thought that she would have to buy them both more underwear.
The blue alien’s cocks had only half-softened after his fuck with Nani. Now, looking down at Lilo’s naked, helpless body, Stitch felt their full hardness return. He took hold of Lilo’s hips and pulled her up onto her knees, her front half still on the floor. This, Stitch had learned from his research on Nani’s tablet, was what humans called “face down, ass up,” and Stitch decided that he very much enjoyed seeing Lilo in this position. At the moment, her two lower holes were by far the most important parts of her, and now they were both right there in front of him, ready for penetration.
“No,” Nani gasped. “Don’t…Don’t do that to her…”
Stitch turned to look at her, and his gaze was hard, unyielding.
“Stitch must do. Will not hurt Lilo. Not as much as if Stitch does not do.”
There was no reasoning with him, and no stopping him. Nani felt a tear slip from her eye as Stitch positioned his two cocks, now both slick with his seed, against both of Lilo’s holes.
“S…Stitch…” Lilo begged. “Please…”
Much more in control of himself than when he had fucked Nani, Stitch pushed in slowly, but still forcefully enough to make Lilo’s virgin anus stretch and stretch until it opened so obscenely wide that his cock could begin to sink into her.
“Nooooo…” the girl moaned weakly. Her pussy had begun to get used to Stitch’s penetration, but the forcible dilation of her asshole was every bit as agonizing as when Stitch had taken her other virginity. Only Lilo’s wooziness kept the pain from being utterly unbearable.
“Yes, Lilo take cocks,” Stitch growled eagerly. “Stitch always fuck both holes from now on. Lilo and Nani will learn to like.”
He pushed in and in until his lower cock stopped against the barrier of Lilo’s cervix. He pushed her ass down a few inches, adjusting the angle so that he could keep pushing his upper cock into her ass. He grinned with maniacal delight as the full length of it sank into her.
“Please,” Lilo moaned. She was more awake now, which made the pain of her anal deflowering more acute. “Please…stop…”
“No,” Stitch said firmly. “Never stop. Lilo take cocks. That Lilo’s purpose now.” He looked sidelong at Nani. “Nani’s purpose, too.”
He started fucking Lilo slowly, savoring the sensation of her two ever-so-tight holes around his two shafts, made even tighter by the pressure of his one cock against the other inside her. Inside his own body, he could feel the place where his seed was stored—which he had completely emptied into Nani—begin to refill itself. That, too, felt good.
“Stitch, please…” Lilo whimpered weakly. “They hurt…take them out…”
“Can’t take out,” Stitch panted, his voice acquiring a ragged edge of lust. “Must keep going…”
“Then, then…at least…don’t put them…so far in,” Lilo begged. “Please…I can’t take it...”
“No, no, must push in all way,” Stitch said, again forcing his thick upper member into the depths of Lilo’s ass. “Must get deep inside Lilo. Yesssss, deeeeep…”
Tears trickled down Lilo’s chubby cheeks. The violation of her rectum would have been very painful even without Stitch’s lower cock filling her other channel and making it even worse. Lilo helplessly clutched the nap of the old rug in her hands and squeezed her eyes shut.
“Stitch, stop,” she wept. “Please…”
“Stitch must pump Lilo’s holes,” the alien growled, starting to fuck her slowly. “Stitch must fill Lilo’s holes. Lilo will get used to it. Lilo will learn to like it.”
Nani watched helplessly as Stitch fucked her little sister for what seemed like ages. Lilo’s whimpers eventually died away, then then the girl was simply breathing in time with Stitch’s thrusts.
Stitch felt that place inside him getting full, his big balls swelling with seed. He began to pump Lilo faster. The girl made little “Nngh” sounds with every thrust.
“Yes,” Stitch moaned. “Yes, yes, Lilo take, Lilo take deep…”
He pumped and pumped, harder, faster, his lower cock butting more forcefully against Lilo’s cervix each time. His two lower hands continued holding and squeezing Lilo’s chubby ass as his upper ones went beneath her body to fondle her growing tits.
“Yes, yes!” Stitch grunted. “Lilo take cock…Lilo take cum…Lilo take ALL!”
He thrust deep into her, and his hot, thick seed began to shoot into Lilo’s body like water from a pair of firehoses. Lilo cried out as the pressure forced open her cervix and Stitch’s cum flooded in, filling and filling her womb. And in her other hole, she felt Stitch’s hot seed expanding her insides and moving upward inside her at the same time, filling more and more of her guts.
Stitch’s hands held her ass in a steel grip as he continued pumping seed into Lilo’s small body. Lilo could feel her stomach distending from fullness, but the torrent of cum wasn’t slowing down in the least. Being filled so much was starting to hurt.
“Stitch, please, take them out,” Lilo wept. “I can’t take any more!”
Stitch grunted, “Stitch…must…fill…Lilo…”
“Please, stop, I’ll explode!”
“FILL!” Stitch shouted, shoving his hips hard against Lilo’s ass and bruising her cervix with his cockhead.
“Stitch!” Nani cried, reaching her hand out helplessly toward her sister as the girl’s stomach bulged to a seemingly impossible size. “Please!”
Just as Lilo thought she was about to pass out, the pulsing flow finally stopped. But it felt like an eternity before Stitch finally pulled his two thick invaders from her holes and what felt like gallons of his seed firehosed out of her. Then Stitch let go of Lilo’s ass, and the girl collapsed to the wooden floor, lying in an expanding pool of Stitch’s cum.
Stitch, now feeling much calmer, reached out his clawed hand and stroked Lilo’s hair.
“It okay,” he murmured. “It not hurt so much next time.”
Lilo was too absorbed in her pain and feelings of violation to hear much of what Stitch said. Except the words “next time.”
- 4
- 5
- 6
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Biological Imperative