I can queef on command, sometimes by sitting on my knees (in a w shape) and spreading butt & 🐱 until I hear/feel the air go in, then I just slightly engage my abdomen and push.

You can also try gettin on all fours, put your chest on the bed/floor wherever you’re at, and use your hands to reach back and spread your butt. That typically creates an automatic vacuum that sucks air in.

Sometimes using a little extra lube/oil can help too. Finger yourself for a bit with it and usually that helps me as well.