RainyDay, this sounds horrific for you; I"m sorry you went through it. Did the therapist wear a condom at least?
A similar thing happened to, I'm going to say, 'a friend of mine' -- when on his back, the therapist hopped up on the table and sat on my friend's condom-less erect dick. "Get OFF; that's not safe!" He got off immediately.
This was back in the late 90s or early 2000s and my friend is still healthy so nothing happened, but it was an unnerving experience. Sometimes all somebody wants is a massage and a HE; not full out sex.
Can you say whether or not this was in Los Angeles?