Didn’t someone here know that German cannibal guy?
Personally, the most evil guy I’m acquainted with is a Congolese man who freely admitted to committing multiple rapes when he was a government soldier in the 2 Congo wars - gang rapes, “corrective” rapes, raping women in front of their whole village…
I knew the woman and her side of the story. “Consenting” assumes facts not in evidence.
Violating the relationship between counselor and patient? Taking advantage of someone you have influence over? It’s not just doctor/psychiatrist and patient, you know.
If it’s a client who came to you for counseling, it’s a definite boundary violation. Now, if the affair started years later, it might not have been, but it’s a very fine line.