I've got you under my skin I've got you deep in the heart of me So deep in my heart that you're really a part of me I've got you under my skin --Frank Sinatra
If any of my characters would sing a musical-style villain song while digesting you, it would be Rox.
This was another suggestion from my wife! We were watching The Muppet Show and a skit with this song showed up in the Vincent Price episode. The skit was very vorish, and my wife pointed out that this seemed like something Rox would do.