[Incest, Slime TF, Size Difference]
"Ehe... Sorry, dear. I guess we weren't too careful."
"It's okay, Mommy. It's just the flu, it shouldn't be that bad, right?"
"Easy enough for you to say, squirt... You're not the one that's currently burning up inside..."
A nervous laugh left the youngest member of a small family's lips. He, his Older Sister and their Mother, were the only ones that lived in this quaint little house together. And that was just how they liked it. That was the kind of life that they liked to live...
Sure, it meant that he didn't learn that much because his Mother was the only one that could teach him, and she was typically really busy trying to deal with the farm outside... But that was fine. He was patient. And he just tried to do what he could.
Which was why his Older Sister wasn't too happy with him. She was in that phase of her life where she was a little too rebellious. She should've probably grown out of it by the time she became an adult, but it seemed as if she was simply acting out because of their Mother being such an accepting and welcoming woman...
But here they both were. Struck by what seemed to be the flu. Which meant that they now depended on him. The tiny 'Man of the House'. If somebody had told him this was how he was going to end up living up to the responsibility he'd grow into as he became an adult, he'd probably look at them with a sense of confusion written all over his face.
Not that it was going to stop him from doing his best to make sure that they were alright. He just had to cook a little stew for them to try and rinse their bodies of any bad stuff that was in them, then he should let them sleep. Sure, his Older Sister definitely had a fever. But if they didn't deal with what was inside their bodies, then they'd just keep getting sick. It was something that their Mother had taught them the last time he was sick...
...
Thinking about back then, that was the last time he had seen her with that kind of expression. There was something about the way she looked at him when she hovered over him. It was like there was this big blush on her face, and... Uhm...
No, better not to think about it too much. She already got upset when they all had to bathe together, so thinking about what she might be thinking wasn't a good idea.
"Just gotta focus on being the Man of the House!" The young boy cried out as he walked over to the big pot, which was still in the process of heating up...
Why did it have to take so long to boil water? Why'd it have to be boiled anyway? He was glad that his Mother had gone through the trouble of teaching him how to make a nice stew, and keeping a nice stash of veggies on hand, but... Why did it have to take so long?
Despite his current position as the only one that could take care of his family, that didn't mean that the boy was mature in any capacity. And as patient as he was with regards to getting to learn what he needed... That didn't mean he was patient enough to wait on a bit of water to heat up, because he wanted to help his family now, not later.
Maybe he should just go check up on them again and see how they were doing. It's not like he wouldn't be able to hear the sound of the water bubbling once it got hot enough to boil.
After putting all of the veggies that he intended on putting into the stew near the pot, the youth walked right back upstairs. Hopefully, things hadn't... gotten... too... bad..?
He paused as he walked up the stairs, his eyes drifting towards a strange blue substance slowly pouring down the stairs. That was... Slime, wasn't it? Had a slime gotten into the attic while they weren't looking? They were on good terms with the local Monster Girl population, so it's not like they were going to attack right now...
The thoughts bubbled through the youth's mind as he slowly ascended the stairs, only to end up bumping his head straight into something extra soft. Which very nearly made him fall over and tumble down the stairs...
"Idiot, I told you to keep your eyes open, squirt..."
Thankfully, his Older Sister caught him. Which made him a little bit relieved, because she seemed to be healthy enough to get up and out of bed. But at the same time, she felt kind of... Wet? And he had definitely not bumped into her belly because it was far too soft to be her toned abs...
Once he looked up at her, however, it all started to click. And he was frankly not sure what he should be doing. She was turning... Blue..? Yes, she definitely looked like she was turning blue..!
"S-S-S-Sis..!" He cried out in terror as he didn't know what to do when confronted with a sight like this, his body rapidly shivering and shaking as he thrashed around. He had to do something. Something that would let her understand that this was bad. Really, really bad..!
His Older Sister simply scoffed as she yanked him past her, putting him down on solid ground again as she started panting. "Shut up, squirt... What are you panicking about, you're not the one that's sick..." She muttered, not even paying attention to the way that her body was turning blue. Nor the way that her skin seemed to melt into her...
He simply couldn't stop looking at her, just as she couldn't stop looking at him. And... And she had that weird look on her face again. That look that was making him feel really, really weird..!
"S-Sorry, Sis!" The youth cried out as he quickly ran into the bedroom, trying to avoid focusing on her for too long. He would never want to watch her melt into herself, or whatever was happening to her. What was he supposed to think besides worrying his little heart out!? It's not like he had ever seen something like this be... fore...
"Aaaahh... There you are, dear..."
A sight that was just as frightening as the sight of his Older Sister melting before his very eyes entered the youth's vision, as he was greeted by his dear Mother. And just like what was happening to his Older Sister, she was... she was...
M-Melting. There was no real other explanation as to how her body was turning more and more into blue sludge. She was losing a lot of her solidity. A lot of what made her who she was. All while she had that sweet look on her face still. It was.. .It-
Thanks to the youth being stuck where he stood, it was incredibly easy for his Mommy to pull him into her arms. Gently rubbing the back of his head as she hugged him so sweetly as so gently. All while softly giggling as if this wasn't a problem...
"There there... You looked so terrified, dear..." She whispered in such a sweet, yet also sensual voice. One that made him feel just as weird as when his Older Sister was looking down on him. "You can help Mommy, right, dear..?" She whispered and giggled. All while he had no idea what she was trying to say...
He was nowhere near mature enough to understand what she meant. If anything, he just tried to struggle against her. Because he didn't want to confront the fact that she was melting. He didn't want to see his family keep on melting into piles of Slime..!
"L-Let go, Mommy! Y-You're melting! You're melting!" He cried out in desperation, hoping that his words could get through to her. So he could make her snap back to normal. So he could have his Mommy back..!
This did seem to make her react, at least slightly. To the point where she gazed at her body and started to prod away at it, a look of mild confusion forming on her face...
"Am I melting..?" She muttered a little, before giggling as it definitely did seem like parts of her were melting. But she was melting onto her dear, so it was okay. "Well, at least you're here with me, dear..." She chimed, as she pulled him right back into her hug. She wasn't going to let him go, not when he was right there... Mmmm... Such a cute boy, right there where she wanted him...
As if things couldn't get any worse, the boy heard the sound of the door slamming open, and the sound of his Older Sister slowly shambling her way inside. Though she was melting even faster, given the sound of slime splattering against the ground as she stomped over...
"Mom..! He's mine..! I always had my eyes on him..! Don't you take him first..!" His Older Sister cried out as she tried to pry him free, though that simply resulted in her melting on top of the two as well. More and more her turned into slime as she sank further and further towards the floor...
Despite their Mother giggling at all of this, the youth couldn't help but be worried about all of this. And as they melted just far enough for their arms to give way, he managed to pull himself free. Just so he could run towards the door. Towards... freedom...
...
He could run. He could run and he could try and get help. But that... That wouldn't be right. It wouldn't be right at all. He had to be the Man of the House. And he had to confront what was happening to the two of them. Figure out what to do from there, and... Well, if there was a way to transform them both back to normal, he'd find the way.
So he turned back towards the pile of sludge that they had become. It was hard to tell which of them was which at this point, because they were simply one big pile. But... That pile was still his family. So he had to watch.
Not for long, thankfully. Bit by bit, the pile of slime started to bubble and tremble. And little by little, two figures started to emerge from the sludge...
It wasn't hard for him to tell that it was his Mother and his Older Sister. Though there definitely seemed to be a few things that seemed off. Namely in the... Uhm... The curve? He thought that was what his Mother called her breasts and her hips....
It was like his Mother's breasts had been copied onto his Older Sister. And her bigger, tighter butt had been copied onto his Mother. Making them look like a pair of sisters, though that didn't stop his Older Sister from looking as annoyed as ever, even if she seemed to be drooling...
"Hot... So hot... So hot..!" His Older Sister cried out as her body seemed to make ripples. She wanted something to deal with the heat inside her. Which was why her eyes suddenly shot towards the youth...
He could feel the way that she looked at her. It was a lot more predatory than it ever had been before. And... And looking at his Mother, he didn't feel safe or secure either...
She had the exact same kind of needy look on her face. All while pushing her arms up against her ample breasts. All while letting her tongue hang out, letting some of the blue slime drip onto the floor below...
"Be a dear... And stand still..." She panted, giggling a little at the thought of assaulting and violating her own dear son...
He wanted to run as he heard them talk. He wanted to run. But he had to stay. He had to stay so they wouldn't cause problems. So they could be better..!
And yet, it wasn't his choice to make. Not as he felt something wrapping around him. He felt his legs snap together, and as he gazed down to try and understand... Slime had wrapped around him. When? Probably when he went up the stairs...
So this left him absolutely vulnerable to their assault. And they weren't going to show him any mercy. They were going to introduce him to the kind of needs that a Monster Girl had, whether he wanted to know or not.
"C'mon..! Fuck me..!" His Older Sister cried out as soon as she came closer enough to wrap around him again, letting her sludgy and slimy body wrap around him. Making it not only impossible for him to move much more than he had to, but also landing him straight in between those massive mounds of hers...
It felt weird to be stuck in between her breasts. Both because she was never really meant to be this big, but also because it just felt... W-Weird. Especially down below...
He just barely managed to look down there, before being shocked at how quickly his clothes had melted once she got ahold of him. And from there..!
A sharp cry left the youth's lips as he was forced to penetrate the area that matched her crotch. He had never had sex, so he never understood any of this. But he did know one thing, now that his little thing was wrapped up by her slimy body...
It felt good. So good that he instinctively started to thrust his hips forward. In and out, as much as he possibly could. It didn't matter that she was super sticky and made it extremely hard to thrust. It didn't matter at all. The only thing that mattered right now was how good it felt...
And while he couldn't focus on her, he could definitely hear the sounds of his Older Sister crying out too. "Finally..! Finally!" She cried out. Wrapping him tightly into herself as she let him thrust in and out repeatedly. She had been waiting for this for so long, it seemed. Not that he ever would've imagined what would push her to do something like this.
It felt good. That's what really mattered. If this was how good it was going to feel if she did something like this to him before she had melted into a Slime... What would he think? He wasn't sure. All that he could really think about was how good it felt, not about the ramifications or anything like that...
He just thrust. Because that's what he could understand. How good it felt to fuck his Older Sister. How good it felt to just meld together with her. It almost felt like he was melting too... Not that he could really tell, with how good everything simply felt. It was like it muted every other feeling inside him, as long as he was enjoying all of this...
But before any of that, he reached what they would call a climax. Letting out a cry that was muffled due to how much his Older Sister covered him. Squirting his sticky seed straight into her. The first of many times that he'd be made to fill her...
And in the process, he left her just vulnerable enough to the point where he could be stolen from her arms. His Older Sister melted back into the pile of slime for just a little moment, as his attention was then forced towards another important family member...
His dear Mommy. He was forced to stare straight towards Mommy, who couldn't help but giggle as she turned away from him as she displayed her rear. Her big, wide rear...
Never before would he have thought of something like that. Focusing on her butt. But with how hard he still was, he couldn't stop himself from latching onto that butt and simply thrusting into the wet and almost velvety pussy that was waiting for him.
This was all new to him. The sensation of fucking with some amount of dominance. The sensation of fucking his Mommy. All these overpowering sensations. They were all so, so much. To the point where his skin started to turn blue too, just as they were...
The more that he fucked his Mommy, the more he felt good. The more he felt good, the more it pushed him to simply keep fucking. It was an endless cycle. One that he was trapped in with no escape... No escape besides melting into a Slime as they had.
And he didn't care. He just wanted to fuck. He wanted to make his Mommy make all those nice noises that made him feel really good. He wanted her to keep on making such wonderful sounds. He wanted to keep fucking her. Over. And over. And over. And over..!
Before long, he let out such a powerful and potent cry. Squirting out yet more of his seed... And, as the overwhelming afterglow started to fill him, he started to simply slump onto his Mommy's back, his cock still nestled within her...
Naturally, as she felt all of that goodness flooding into her, his Mommy simply smiled and patted him on the head. Giggling softly as she watched him melt into her. Just as she wanted. Because as much as she wanted to fuck him to deal with the heat inside her, as much as she wanted him to fuck her because that was her basic instinct...
She also wanted him to be with her. And with her dear daughter too. They were meant to be a family. A family that was made to love one another, even after they all became Slimes.
So she simply smiled. As the puddle that made up their combined body continued to melt and meld. As the puddle simply bubbled and rippled, as it grew nice and flat on the floor...
A puddle of Familial Love, ready to return to their new slimy forms once they had all recovered...