So I took some time to think about the Iron Maiden of Blending and came up with some ideas for the design. I hope you don't think I'm intruding on anything by making the suggestion more detailed but… I'm already going to pay for this cum Friday so I might as well go for broke.

Perhaps the blender spikes go into the victim as small, pointed rods that unfold the blades once fully pierced. At this point, a heating element at the base would activate to fuse the skin and muscle of the abdomen to the spikes while the blades would begin to blend the contents of the abdominal cavity.

Obviously the poor girl would shortly die of blood loss but because of the separation of the chest cavity from the abdominal cavity she should survive long enough to see her insides spew out one (or more) of her orafices when squeezed depending on which ones are currently plugged up.

Unrelated, please take as long a break as possible; I find it super hard to find smut that caters to my very specific fetishes even on this site. Tsade was one such author and you happen to be as well.

Now onto answering a rather specific question; I've nothing in particular against Kasia other than that she killed Tesni. Call me a vindictive bitch but I'm shallow like that and I love a good for of karma even if I did help set her up for it. Beyond that she really does flirt with danger a bit too much for the situations she finds herself in. The twins nearly gave her the swim of her life while Tesni was barely kept from letting Kasia fly into that great over yonder (probably someplace on fire in Kasia's case). One day her luck is going to run out. Hopefully around the time Dave makes good on her request.

And finally, I vote for a combination of 2 and 3. Tragic but open, kind of like the way Doctor Who changes seasons but a little more permanent for our companion character.