Hello Josh I apologize for the delayed response. I haven't been able to post for some reason. However to answer your question. No the session will not be over if you ejaculate early. The goal during your session is to help you become aware of your body and learn to separate orgasm from ejaculation. You will be being brought close to ejaculation but backing off. You will learn to ride the wave of the Tantric Orgasm.
I hope this answered your question sweetie Please feel free to call me if you have any other questions you would like answered.