Since you only made one wish on her you think it’s only fair to meet her only part way. You say “I wish that humans were dragons since time began, and I wish that I will always be a mature male dragon stud!”
You weren’t quit ready to give up your malehood just yet, and besides... you got an opportunity to experiment with your new exotic mother.
Your mom looks at you with a mixture of surprise and barely suppressed indignation, but she stops short of saying anything as she watches you start to change.
You quickly begin to grow in size, feeling the world and the formerly intimidating dragon in front of you shrink. Your features harden and mature; your spikes elongating and you become definitely more masculine and muscular. Your wingspan painlessly stretches too twice your body length and your claws are veritable great swords. You even out around 6 and a half stories high, heads and shoulders above your diminutive mother.
Your mother chokes out a guttural “wha-what?!” And shrinks back, As you diside. What you want to do.
Now that you think about it, your size isn’t the only thing that’s grown. You look down and see a massive pair of balls and a mystical black member standing at half mast at the sight of such a beautiful female.