The Silver Palace

Leaving Sakata a lot quicker than the others, Jenny headed to Niigata after getting her snake remodelled with a FUCK TONE of weapons and defence technology. They used the digging tech to get to Niigata which they planned to make the strategic headquarters for the state and form a defence line to attack Tokyo. But as they were in transit they came across a peculiarity, suddenly, the snake stopped and when they exited they found out why. Outside the vehicle were 2 siblings [https://wimg.rule34.xxx//images/1599/406a7061c871b2dd486b04e56cfcb319.png?10424177], a younger futanari sister and an older fitness model who had just left the lingerie and swimwear model industry before the outbreak. The sisters were going on a trip to more rural parts of Japan to escape the hustle and bustle of the city when the zombie plague transformed most of humanity. Thankfully, the sisters were the only family members and thus didn't take anyone else on their trip and were being driven by the older sister Harui. Unfortunately, they were also at the site of a major and unstable world shift, bringing the legendary and mythical Silver Palace that was kilometres long and wide with many towers and interesting architecture that didn't simply follow linear and symmetrical designs. The worst part is that it didn't smoothly or simply take place on the land but crashed down due to it being in flying mode, merely 1 of the many features put in by the Silver Dragon Sarui.

Long story short, it crashed and was deemed unusable by all forces, leaving Harui and her younger sister Mineta trapped in a very large and open cave system that was created from the castle's automatic defence systems. To survive they ate the slimes and lived in a spherical hollow rock on one of the many catwalks, they didn't need to worry about seeing because the slimes came to them on their own and fed them until they got used to the small amounts of light hitting inside the caverns. Other problems were similarly non-existent because they got lucky enough to have the temperature be warm enough that they could go in skimpy clothing or naked without worrying about heatstroke. The only problem they had was that Mineta didn't get any internet or privacy and was constantly with her sister's company who ignorantly hugged or cuddled up to Mineta frequently, raging the beast inside of her. It got so bad that Mineta began masturbating to Harui's sleeping body and using her pet slimes she tamed to clean up her semen and pleasure her. It was only by a stroke of luck that Harui didn't indulge in the isekai or slime genre and thus didn't know that when the slimes they tamed changed due to specific "diets", it was because Mineta had used Slime 1 and 2 to clean up her cum while Slime 3 had Mineta's dick shoved in it, getting not only semen but pre-cum and lewd energy. However, knowing that her sister is a futanari and hearing stories, Harui started to get suspicious when their new pet, Slime 4, turned into a waste slime, eating their poo and piss and attracting other slimes that allowed them to have greater appetites and consume more of the nutritious slime stuff. Thankfully, Slime 3 was there for the win and helped Mineta score by cuddling up with Harui when she slept, allowing Mineta to get more frisky with Harui's sleeping body. First, she only rubbed her dick against her, then she started grabbing her ass and tits, then she started using her body for exterior sexual indulgences like thigh-jobs and finally, she got the balls to absolutely go to town on Harui. Both fortunately and unfortunately, Harui woke up and began wondering about her situation but also thought it was just a very erotic and sexual dream, moaning back and fucking Mineta with all her might, eventually getting used to Slime 3's human body while Slime 3 and Harui pleasured Mineta or got Mineta to go full stud and fuck them senseless. The sex was so good that when they were done they all fell asleep and allowed slimes 1, 2 and 4 to clean up, allowing Harui to enter a state of denial and think it was all a dream. As for the reason this was fortunate, it was because the truth about slime liquid is that long-term consumption by females can cause them to become sick, the only way to satiate their hunger is by consuming other products but since they're in a cavern there was nothing to eat besides Mineta's sperm. Thankfully, the slimes' nutritional value on men makes up for the effects on women by making their sperm very nutritious, meaning that to survive, Harui would need to start sucking Mineta dry for an unspecified amount of time. Another good fortune was that they had created a slime girl, Slime 3, who was able to help instruct them on what needed to happen after realising that the two of them didn't know, leaving the ashamed Harui to accept the situation after her "sinful dream" which made her realise how much she wanted her little sister's dong, a cock bigger than all the men she fucked. Thus, a very sinful and debaucherous relationship began between the 2 sisters who fell in love with each other's bodies and did all sorts of sexual acts, becoming more depraved and turning all interactions into slight sexual incidents. Even when they are just talking, Harui will be jerking off Mineta or doing something highly arousing that gets Mineta to fuck her or masturbate furiously. As for their situation, the two had made significant leaps since then, creating a slime farm by using rock slimes so they could harvest basic slimes and turn them into silk slimes, creating a material that allowed them to create shades, a staircase to the Silver Palace, hammocks and generally just improve their lives as they moved into the Silver Palace, gathering dope shit and becoming basic-level sorcerers.

A bit after this, Jenny and her harem entered and found them, sending the tech and science girls out to explore and understand the Silver Palace while they talked to the women (Note that the image used to show their appearances is how Jenny and the others found them). But things quickly became clear that their bond had only grown stronger while in the cavern and that Mineta was afraid the strong, powerful and sexually impressive Jenny would steal Harui away. To that, Jenny simply laughed and embraced all of them, asking them both if they wanted to indulge in her body, something they quickly accepted while also making sure they didn't have their bond overridden. Though not Jenny's intention, her body still accepted the challenge and after 13 minutes both of them were already begging for Jenny's cock and cum alongside Slime 3, serving as their welcoming to the harem. After this, they then had an afterparty with Matriarch, Jenny and Mineta forming a futa train where they fucked each other and an extra bitch.