I really wanted to do this one so bear with me. I hope y'all enjoy it.
Hatsune Miku is doing numbers, and her manager wants to really blow the top off her shows (no pun intended). Thinking more audience engagement may be the best move, and something wild to boot, they decide if she were to perform with an audience member inside of her gut it would sell tickets like crazy! Ensuring to eat lots leading up to the show, expanding her appetite, and not eating anything on the day of the show to ensure lots of room, she gets on stage and her stomach is growling loudly, almost picking up on the mic. Before the volunteer walks up on stage and Miku swallows her whole. Sliding down her throat with a bit of effort she packs her away as the audience member squirms and writhes inside Miku's gut which glistens with sweat as her body works hard to digest her prey. Swollen to inhuman proportions and delerious with the sensations rippling through her body of ungodly fullness. She finishes her concert to roaring applause!