Erectile Dysfunction - not a helpful label
I would love to offer some of my education and experience with "erectile dysfunction," which I think is a bad way to start off altogether. Unless there is a medical issue that needs to be addressed, labeling a non-erect penis as dysfunctional is not helpful at all. It implies an expectation, which I've found adds undue pressure which can prevent the natural arousal to flow. The first thing that I've found to be helpful is to work with a provider who doesn't have judgments about these sorts of things. Setting a goal of co-creating a very pleasurable and sensual connection is great, and giving the mind and body permission to relax and be in the moment, without expectations is paramount.
The next helpful practice is to just focus on the breath and the sensations the body is having (not what isn't happening that "should" be happening). Really listen to the body and notice what feels good, and what could feel better. Give the penis the right to relax and do what it needs to do. This may take several sessions of working with a talented practitioner before a trust and intimate bond is created, however, I've frequently found that communicating about the experience and allowing for pleasure without any other expectations has lead to explosive orgasms that were far beyond what might have been anticipated.
Further tips can be explored through the practice of Tantra, Pranayama, and exercises which cultivate chi or qi within the body.