First take a deep breath, we all backslide you know we do. You’ve expressed your worries to your W no need to over labour the point. Do not drag OM’s kid in either. The issue is with your D so stick to the point. Don’t mention OMs D, leave him and his W to deal with that one.
You’re over analyzing, step back, focus on you once more.
Should she bring it up a simple sorry, should suffice.
Remember, when you were your Ds age, if someone told you not to do something what did you do? Yes went right ahead and did it in secret (maybe that’s just me).