As a "pear reaper" I must say it was a crappy design. The only fun was to force closed pear into anus (it must have hurt). But later on.... well it would tear her intestines, cause her a lot of pain. But what about anus?
I like the image of anus/vagina being torn apart. For that - pumped dildo is a great tool of torture. You just force it into her anus and than pump it up. There will be a moment when it is to big for her anus orfice - it will brake it apart. And than you pump it even more, till it is so big, that it is causing damage inside of her ass.
If it is not enough - after breaking her asshole it would be a time to put classical anal pear into her. Than the metal spikes could do their work, ripping her from inside