Works can not express how much I loved this. It's been months since an author posted anything even remotely related to the extreme nonlethal niche you two are so famous for, so reading this story was a breath of fresh air. Even better, if I'd known you two working together would produce such an amazing story, I'd have suggested you do it way sooner than you did.

I'm not sure if you two are going to continue this, but I'm going to assume you are given that you left the ending open for additional chapters.

I'll just post a list of ideas that are hopefully original enough not to be boring, especially since you two essentially ran the circuit as far as nonlethal guro goes by including just about every kink and fetish found in all your stories combined plus some in the case of the bladder prolapse.

Seeing as it seems like you're going to be having the girls explore the city in the next chapter, you could have them go swimming in a pond or something similar and have a snake(for instance) snake its way into one of the girl's bodies. In the case of Janet, it could either go up her vagina and out her fallopian tubes into the rest of her body or go through her ass where it could potentially wreak havoc on the rest of her body. In order to get it out, Clara could force her fist down Janet's throat in order to reach the snake, potentially being forced to remove several of Janet's organs. In the end, Janet could be completely gutless.

As for Clara, the snake could go through her fallopian tubes as well, but something even more interesting could be the snake going in through her head and traveling down her spine. In order to remove it, Janet would, of course, have to force her hand down Clara's spine where she could potentially end up removing Clara's pelvis. It'd be interesting to see how far she could stretch without her bones in the way.

Another idea is the concept of nipple fucking. You could open the idea up with one of the girls mentioning she missed drinking milk. This could lead to them trying breast milk as it's technically from humans and thus they might be able to drink it without vomiting. Taking it a step further, one of the girls could attempt to prolapse the other's nipples(don't ask me how it would work), failing that, one of the girls could remove the other's milk ducts and glands without damaging them in order to have better access to milk. On a side note, this could potentially solve any food issue the two might have as they could live off each other's(or their own) breast milk.

You could also have the girls gain the ability to control their dismembered parts, such as Janet's vagina and womb if it were ever to be torn out of her. It would open a whole new range of possibilities if the girls remained connected to their body parts even after being separated from them. This would also allow you to remove Clara's brain without worrying about her losing her eyesight and having Clara steal Janet's vagina and womb for a prank is just all kinds of promising.

Building on the last idea, you could have the girls gain the ability to reattach parts, whether it's their own parts is, of course, entirely optional. You could even expand this to have Clara(or Janet if she has the chance) control other bodies by placing her brain inside of it. You could even have the girls attach multiple copies of the same organ, such as Janet deciding to have two vaginas.

As far as more brain fuck goes, in addition to whatever shenanigans occur due to removing Clara's brain, you could have the girls end up at a doctors office at some point and decide to use the technology there to see if they can learn anything about their condition, which would include studying Clara's brain. In this scenario, Janet could attach sensors to Clara's brain so she could study it on a computer and inadvertently figure out a way control Clara's mind and body with/without her knowledge, even going so far as to view her memories on the computer. If you feel like throwing any sense of realism out the window, you could have Janet download Clara onto the computer where Janet could toy with her online with all the power of the internet at her disposal. This would, of course, leave Clara's body completely empty and mindless and free for Janet to toy with in ways Clara might not have been completely comfortable with.

And for more ovary/fallopian play(because I'm quite fond of that as well), you could perhaps have the girls get caught in a situation where a vacuum the gets shoved into either(or both) of the girl's vaginas and essentially neuter them. They could then go on a journey to get their ovaries back, which would be especially difficult if they retained a connection to their body parts and thus experienced whatever was happening to their ovaries.