I will accept your word for that. ;-)
I have read your distinction between a deductive and inductive  interpretations of Natural Law and your preference for the latter: I'm not convinced. 
To judge the morality of sexual activity upon how we experience it would legitimise many more types of sexual activity than simply heterosexual and homosexual, which I'm not going to mention here.
Regardless of the situation the accompanying pastor cannot ignore the teaching of the Church otherwise why would he claim to be a Catholic? He is duty bound to point it out to his fellow Catholic seeking his counsel. Having done so, the 'accompanied', if he was culpably ignorant no longer is so.
Discernment is another word for judgement.  To judge whether something objectively wrong can be right under certain conditions is 'situation' ethics, the belief that one can deliberately do evil if the outcome can be deemed good, the end justifies the means. The Church teaches that this is never permissible.