My recommendation goes for pure natural coconut oil. Or do yourself a Essential Vein Oil mix!
http://www.mattersofsize.com/forum/boo-boo-s-and-band-aids-safety-in-penis-enlargement/48563-erosets-vein-oil-for-thrombosis-and-more.html?highlight=evo+oil
I can suggest using Jojoba oil as substitute for olive oil; less odor and better shelf life from what I've understood. A bit more costly perhaps. I bought a bottle of jojoba and the needed essential oils, removed a bit of the jojoba oil to different container and added the essential oils. Invigorating smell for one thing.
Stretch marks might still happen as you're growing and the pace might be fast. I have a longer mark to show that I've grown since the day I've started.
Your dick is going to be out of sight anyway when you're pounding someone
But surely an good looking penis is a nice thing, I'm not denying that.
If around your
package, I could almost (almost!) say something about dermaneedling. It's not a one night wonder, but more like a session you do once, apply conditioners etc., and in few months there should be difference. I'm trying some dermaneedling on my forehead, as my face is lively and I've gained a small wrinkle on my forehead already, while being under 30. (Well, 30 by September, I try not to think about it.)
Anyways, best of luck. Bio-oil is an option; it's just a bit more chemical than jojoba or coconut oil in my opinion. And I did use Bio-oil for a while, it's decent stuff, just throwing alternatives here.