I'm not sure about making it an R&D quest (maybe make asking Asterion about how his therapy is going a part of his hangout thing?) but despite finding the idea of a Normal Human Therapist desperately trying to process Asterion's sessions kind of hilarious in a "I probably need therapy too" kind of way, I feel like a supernatural would probably be better equipped to help him.
I would also include it in the main plot as a recommendation by the MC and have them show up in a similar manner to how the lounge manager and the chosen guest do. Finally, I heavily encourage it be an orc for no other reason than I just love orcs so much and I would love to see one in this game ;-;