I love that you've taken the time break down the scene structure! That's exactly how I approach building scenes. And, in fact, I've already been working on a JOI scene, so your ideas will be super helpful to fleshing out additional options!
Since this is a reward scene, I wasn't originally going to include ruined orgasm or edging, but given how you're envisioned this, it sounds like you would not consider these to be punishments?