Well I think its a well known fact that erotic (I think is called that way) transference happens. I think is no body's fault, well not if its handled properly. If it is abused it is already illegal and therefore punishable in court.
I must say I have never experienced it. I like my T, sometimes I project hate/love/... emotions on him. Sure as hell he countertransfers them back. But I have never fell in love with him. Maybe it is because I have never fell in love with anyone. So I would kind of welcome it to happened,cause than I would be able to fall in love with somebody else.