I am assuming that you are a female. If you are, then he is not going to assume that you are not going to jack him off again. He will be anxious for his next visit.
No ethics you should be ashamed not to mention fired you child molesting freak!
OK, I guess I should have mentioned that he is 18 years old, not a child. Second, I am a man, so I think it was as unexpected for him as much as it was for me. Third, there was nothing non-consentual going on. We both knew and enjoyed it while it happened, it was just awkward after, that's all.
Reguardless of his age, he is still in high school and when you are in any kind of medical profession including therapy you have no business fondling your "clients" in any way! You lack the moral core to remain in any kind of profession that you will be left alone with a young person. If I was that childs parents I would sue you and the company you work for. Also, if you had morals, which you certainly don't, you would know the mental harm something like that causes. I would watch my ass if I were you for a very long time.
Big mistake, dude!
You're going to be worrying about this one for a long time - even if he is totally cool with it.
Notice, how he hasn't replied in a while... hopefully he was caught! People "pop a tent" during massages all the time, this does not give the therapist the go-ahead to jerk them off, even if the guy laughed about it at first. He was most likely shocked to find your hands going up his leg into his pants. You are gross!