The electric shock cruising through his body, dressed in skintight shirt and shorts, made him writhe, but as he was constrained to a wooden table, all the movement was to no avail. 

The shadow in front of him laughed as the staff of the mage descended on him.
"This will be pretty uncomfortable, but I needed a test subject. You're lucky, I had only one test to do right now. Otherwise your friend would've gotten some magic exposure, too."
His voice booming while pointing to Takamiya, who just had woken up from the artificial sleep, the wizard put him under.
"Nothing that'd make [i]you[/i] happier, though. If everything goes by plan, your life will be completely different."

After a little chuckle, the wizard aimed his staff back at the hapless teen. A red ray impacted his chest enveloping his whole frame and then vanishing into him.
For a few seconds nothing happened until suddenly his shoulders started cracking and shifting inwards. Simultaneously his hips moved into the opposite direction while his waist receded, too. A bit later, he started to feel himself getting shorter, the skintight clothes shrinking with him, though.
Next, his chest started to ripple and two bumps on his chest pushed themselves out into two small mounds which seemed bigger than they actually were through the shirt they were pressing against.
Now, however, the most uncomfortable feeling of all took place. From the outside, it seemed rather minor, just a bulge vanishing and a fat crotch forming, but of course it felt a lot different experiencing the shift of genitals personally.

In the aftermath of that, his, or more fittingly, her hair slowly turned into a pinkish colour and got a lot longer having to form into long twintails.
Some other, comparatively minor, changes were, two fangs, thin arms, hands, legs, feet, a girlish face, the bangs and even some noticeable age reduction. It seemed that she had lost about two years, as she looked like 16 now, however one could confuse her for even younger.

As soon as all the changes were done with, the wizard send in another, blue, spell, which, physically, didn't do anything.
"Everything worked just fine now" He dropped some clothing, specifically a girl's school uniform including fitting underwear, and an ID on the table next to the one the poor boy gone girl was still strapped on.
"Have a happy life, Aoyama [b] Rika [/b]. This name will be the only one you can recall as yours."

Just as mysteriously as he had captured both, the wizard vanished, but not before magically swapping the skintight clothing with the school uniform leaving it to Takamiya to unbind her.