Growth maxes out at around 2 years on T typically. So it may still be early for you.
There are two options to increasing size. Size changes from pumping are generally not permanent. I pump daily for about an hour and I have seen no permanent change in size from pumping. Pumping does stimulate blood flow throughout the tissue though, so you may have better erections.
The other option is DHT. That isn't recommended until you've been on T for two years. It's a topical gel that is applied directly to your junk and if you have any androgen receptors left down there, you will experience additional growth. I've had no luck with it.
And yes, I have been able to penetrate my girlfriend. Works best with girl on top.