... Yup, we all make mistakes along the way!No worries, though, as long as it didn't shut down her curiosity altogether.
The fact he expressed an interest in his response probably secretly pleases her.
Sounds like she is titillated by the idea, unsure of proceeding down that path, and both turned-on and disconcerted by her husband's kink ...
From what little I have seen, she looks very attractive in the tiny avatar thumbnail pic, so, if she ever became 'proactive', that is to say took an overt interest in flirting, and exchanging texts with guys who are sexy to her ... Well, it wouldn't take long, she would be deluged with replies ...
Your main challenge is to have her not only accept your fantasy, nor even agree to act it out, but to actually make it her own, allow herself the delicious thought and possibility of being able to enjoy all the extramarital fruits without the indigestion.
