No. Simply no.
Testosterone comes with ester dissolved in to oil.
With a long time bodybuilding past I can assure you that you can not inject these oils intravenous. Injecting anything to your corpora cavernosa or corpus spongiosum you are doing just this. It might lead to severe complications. I have gone that route accidentally injecting to blood circulation and it was bad.
Only form of testosterone without ester is testosterone suspension. Even this form is no go as it is crystal form of testosterone dissolved in water and I can promise you injecting this stuff anywhere in your body is very painful.
HCG is not going to act as a filler in any situation.
HGH is not going to act directly in penile tissues. Elevating your HGH levels you increase your IGF -1 production which might give you some effects in penile development. But then again you need to be using very high amounts of HGH to even approximate the effects of injecting IGF-1 alone.
I personally feel sick reading people like your mystery man in some group talking about steroids without any knowledge at all.
START 18/13.15 cm Jul 24th 18 (7.09/5.18") NOW 22.5/15.2 cm Fer 12th 20 (8.86/5.98") GOAL 8.5"/ 6"
When connective tissue is stretched within therapeutic temperatures ranging 102 to 110 F (38.9- 43.3 C), the amount of structural weakening produced by a given amount of tissue elongation varies inversely with the temperature. This is apparently related to the progressive increase in the viscous flow properties of the collagenous tissue when it is heated. (Warren et al (1971,1976)