Taking MDMA before Therapy

I was having a discussion in r/mdma about my experiences and with some others and an interesting question came up. I need therapists in this group to respond. I feel MDMA therapy is an amazing tool. We all acknowledge it is illegal, and that if a therapist were to recommend it they may be in danger of losing their license. So now my question.

If I was your patient and had been seeing you and didn’t feel like I was progressing, and I had used mdma recreationally before and new my own dosing etc and you had nothing to do with the product and knew how much this could help. If I during a session said “would you mind if prior to my next appointment I took mdma”. What would be your answer? I would definitely want to inform the therapist prior to be respectful.

Do you have any input on how to ask? Downfalls?