Honestly, I was skeptical too. And here is what happens to me when He commands, your mileage may vary:

First, I have to be aroused as of now for it to happen at all. He can say the word during normal conversation as a command, and I'll get that "fluttery feeling" but it doesn't have the same impact. Perhaps I will overcome (ha!) this in the future.

Second, the feeling is different from a "normal" orgasm. I too, have very hard orgasms when clitorally stimulated and this is not like that at all. It is only with Him that I have ever had an orgasm from straight intercourse, without the clitoral stimulation, so perhaps that helped to pave the way for this conditioning. That type of orgasm is different, it feels deeper... not centered in one spot like a clitoral orgasm, if you see my meaning.

The Cum on Command orgasm (for me) is more of a tensing sensation. My entire abdomen tenses, then the shuddering happens, and then the tiny bit of release. It is not the same as a penetration or a clitorial orgasm at all. But it is certainly a stronger sensation than the "fluttery" feeling.

I hope this helps. It is certainly a different experience.

My suggestion is to keep on working WITH the stimulation. Have your Master tell you to cum while S/He's stimulating you, or if you are on the phone, while you're stimulating yourself. Do this as often as you can.

Another thing that helped me alot, was when He told me I could NOT cum unless He could hear me. *sigh* So, I got VERY conditioned to His voice. If I was about to cum I'd beg him to "Tell me!" so that I could hear His voice as I did. (Actually, I still do this. If we are having phone sex I will beg Him to tell me to cum. I find it difficult to climax without His voice now, unless I'm using a vibrator, which I do not always do.) I participated in my own conditioning in this way.

Then one day, after a marathon phone sex session I had already cum from stimulation and His voice, and He said it again.... and it just happened!