Real advise: talk to a doctor. Attempts of self-******* of the erectile function within the context of a kink should trigger at least one appointment with a health specialist to make sure all the safety checks are in place.
Gossip advise (the one that you should not follow, but just fantasize about): baby steps. Leave irreversible for when you are really sure that's what you want. On case studies, lots of soy and other sources of phytoestrogens and Isoflavones lead to impotency and reduced libido in young, otherwise healthy man. In those studies, they had a diet that provided some 300mg of isoflavones (3 quarters of soy milk, to give you an idea).
On the good side, it was something that reverted after a few months when they stopped that diet. On the bad side, you may need to buy a bra for your man boobs!