An example that comes to mind for me is when I found out that ex-marriage counselor's wife was ill (complex set of things that led me to realize this), then months later, when I found out she'd passed away (OK, that was a bad feeling and a google that immediately turned up her obituary). Both times, ex-MC was willing to talk about it, but he was visibly uncomfortable. He normally shared quite a bit about his life, but of course this was different. I regret now pushing him to talk about it as much as I did, but transference left me feeling like I NEEDED to talk about it.
And I suppose for my current T, Dr. T, he suggested before that talking about clients' transference or attachment to him can make him uncomfortable. And we've addressed that topic a few times. But he's also said since then that it's OK if he's feeling uncomfortable about a topic, that's for him to deal with and worry about, not me.