There is a young wizard in training hovering over you in your boxer shorts

You notice that the man who is hovering over you is some sexy, muscular hunk, and he is holding a wand. You realize that your blanket has uncovered you and that you have a huge tent in your underwear! Your cock actually feels bigger than it usually is. You also see that the man is just in a pair of trunks, with a considerable bulge.

"Hello, who are you, and what are you doing in my room?" you ask the mysterious man.

"Who me?" he responds. "Oh, I am a wizard in training, particularly training in the realm of men's bodies! You have certainly reached a magical age, and as such, I must grant you what you deserve! Your genitals should reach full development by now, and so I have given them full development! Do you like how they have developed? If not, I can still change it."