Becoming a ruined beta bitch

Hey first time posting I am a twink built male in my early 20's who has been with my gf who is around the same age since we were 17 and 18 and have lived together on our own ever since. We were both very kinky and openminded and both able to dom and sub for each other with her always knowing and enjoying some indeed extremely kinky cuckold fantasies/possible realities. I started prone masturbating as I really enjoyed the feeling and found the idea of "ruining" my 7 inch cock which is average thickness wise so a nice size cock forsure able to please no problem but nothing really special. well fantasy has kind of turned reality as I have developed peyronies disease really young with no option of surgery as it does not affect anything major just my erections. In just a week I have shrank from 7 to maybe 5.85 inches when hard with my erections already becoming a bit softer she is aware but does not seem concerned at all even seeming to enjoy my struggles loving to see me try and get as erect as I used to. Don't get me wrong it does also still feel very good maybe even more than usual when the slight pain is present just not as hard. I get incredibly turned on thinking about whats going to happen to me and was wondering if I could get some advice or experiences with this as I feel like being my age not as many people are yet open or interested much in the whole cuckolding lifestyle. Is peyronies really a sentence to permanent ED and if so is there anyway to speed up the process of shrinking? my logic is that the more you get hard then soft then hard and the more it stretches the more it would shrink? that could also be totally wrong I really have no idea looking for some help lol