I've had a normal, healthy, longer-term relationship with a hobby guy (still one of my closest friends). My longest running fwb friendship came from here, too. It helps when the guy isn't too rich (active) and when I'm cool with dropping the gig. I've also met a few people I consider in my top 15 to 20 of close friends...so I know a meaningful, long-term interest is possible in this place.
That being said, being pursued by a client isn't cool. If I want to graduate you to one otc date, then fuck buddy I'll let ya know... with my face sucking you back inside my door by your belt buckle.