Psychotherapist with ED

I’m in a strange dilemma. I started to work with a client with erectile dysfunction. (37 yo, intellectual, and in good health). He came to me specific for a CBT approach. I suggested using hypnosis too. He agrees. The therapeutic relationship is perfect. The client knows very well his goals and he's involved in the therapy. Yeah, I know, you might say this should be easy, but it’s not. My client is another psychotherapist (junior, in experiential psychotherapy). And his qualification makes me to not be so comfortable to work with him. Sometimes, I can feel his critical look, and anyway he already know all the process.

So… my dilemma is: Should I continue to work with this guy, or should I quit?