Setup: Both kids are lying on their back, preferably on a bed. I’m kneeling between them, facing the bed.  I’m the Dragon.
Gameplay: I take a big breath in, puff out my cheeks.  Then exhale and deflate my cheeks.  I do this a few times to build up anticipation.
Then, on my 3rd or 4th exhale, I pretend that I can’t exhale and look nervously around at the kids.  I’m about to give one of them a raspberry with that exhale.
I might raspberry the tummy, the leg, the arm.
They LOVE this game!