Infestation

Lab accident
After checking on the scientists in the Science Lab Tower the next day after bringing them new specimens, Lust Doll would learn that something went wrong in the labs; the meat parasites escaped captivity and infected entirety of the upper levels, and even sealed the entrance.

Getting help
If there's one person who can help there, it's the queen of the parasites – a woman who calls herself Mistyra, whom Lust Doll previously encountered on the Deserted Base. After beating Mistyra in combat, Lust Doll explains to her that they came there not to fight, but to ask her for help. Surprised at first, she agrees to provide aid.

Mistyra provides them the basic information about the Meat Parasites, and how to fight them. Every infestation spreads about the sphere-shaped thing known as the Meat Core. Meat Core is not just the heart of the infestation – it's the brain as well, and would violently defend itself with all available forces if disturbed. It's very hard to deal with mature Core, but young one, like one which just developed in the lab, can be found and destroyed relatively easy.

Mistyra agrees to accompany Lust Doll to the lab, where she, despite Linda's initial hostility, uses her powers to remove the meat wall preventing the access to the upper floors. Then she proceeds upstairs, ignoring Linda's protests that this zone is classified – the scientist has no means to stop her, after all, nor she's in position to reject whatever help is available.

Infested lab
Lust Doll proceeds to the upper floors, and Linda follows along. Upper floors are mostly covered by meat infestation, creating several isolated chambers accessible only through holes caused by the parasites-induced damage. While traversing the "labyrinth", it's possible to find several surviving scientists still trapped inside; once contacted, they would return to the safe lower floor. Only one of them is actually mandatory to save – the one near the glass containers – as he's the one who knows the upper floor's access code; the others may be ignored without any consequences. It's also possible to find the lost plush toy; if retrieved, it can be returned to one of the scientists for money reward, earning you 200. And one of the floors has the chest, which, if opened despite Linda's insistence that it contains "important scientific equipment", would contain a single piece of junk.

Once you reach the elevator on the upper floor, Linda would ask wether you're ready. Once you open the elevator, you would be attacked by the enormous meat mass – Infected Abomination. Losing to it leads to a Bad End. When it gets defeated, the elevator collapses. Lust Doll would awake in the basement, alive and uninjured, but Linda would be gone. Fortunately, there's the exit to the New Ark Slums through the sewers. When they return to the lab, they would see that Linda didn't return, and no one knows what has happened to her.