Okey interesting. I will add a post then.
The only way to grow your dick without doing any manual penis enlargement, would be to use: CRISPR gene editing. But it's not possible now...maybe in the far...far future. You need to change what your body are producing/doing preferably already before you are born (change the genes). But there are many risks with this, if you change one thing, other things will follow.
For example:
Maybe you have found a way to increase the penis size on a human before they are born...but if you change these gene... the probability for something other to change as well is extremely high. Maybe due to this gene editing this human would have a bad heart?
But this is way outside of my knowledge base. I just have a really shallow understanding of this. This is everything I know about this. You can use CRISPR to change your genes...I don't know anything else about it.