Yeah, I miss when the Prototype Test Bay had a version of this that included a butt plug and she could go a lot bigger, but honestly I imagine that version got lost to the aether because the face textures got borked pretty bad.
Kinda wish the PTB didn't just keep changing, I had a link directly to the version with the plug, but if you go there now it takes you to an experimental update to A Bellyful Life over on FL's main account, https://fierylion.itch.io/