Find one person to torment so bad that they not only start to like it, but also want to try it on others themselves. People will loathe hearing that you've infected someone into being a disciple
Throw me some suggestions for characters since I want to have all the eeveelutions. I also have gen one planned, and I want to go bigger as things go. Maybe one who's really embarrassed about things but can't avoid "slips" here and there...
If you get banned from a place because you keep ripping ass, stuff a nearby toy with them and tell them to walk in there instead. You have to keep the outside clean, so maybe use a hose. This way, you can gas out your targets remotely. That or destroy the building directly.
Eat more dangerous things to power up your ass blasts. Somehow explosive force and that expanding gas increases volume. Eat radioactive material and make yourself lethal. Eat the all important time stone so that your stomach is a time chamber ready to ruin cities in minutes
Gagging on your breath and knowing a single twitch can make that timer shorter using them as fuel. Rub your belly and squeeze it, talking about how upset your stomach has been. Ask them if you can let a little slip in exchange for a few extra minutes.
New idea for an escape room. Give it to them by surprise and let the door lock from the outside and let your rumbling be their timer until decide they failed and make the room inhabitable. Bonus points if one of the keys requires a sacrifice to willingly climb in your maw...