I'd be both flattered and uncomfortable. I'd thank him for offering and decline. It's not that it isn't a nice offer--it is. Neither do I think it's necessarily/automatically unprofessional or unethical--it's not. I'd just question the necessity of it and wonder if my T was getting too wrapped up in my treatment, or if there was counter-transference at work or something. It would seem--like many of the anxious situations I've had to face--like something I'd have to do on my own.