“Alright, from now on we’re going to do a proper examination.
Class president, would you come up and help with the checks?”
At the school nurse’s words, every pair of eyes in the classroom swung toward me.
I stepped forward as if I’d been waiting for exactly this moment.
Parting the sea of girls, I slipped behind the curtain.
The school nurse looked faintly surprised.
“Oh my, Sihyuk—you’re the class president?”
“Yes.
That’s me.”
There was no way I was going to miss a legal opportunity to freely handle the bodies of more than twenty beautiful girls.
“A boy as class president… first time I’ve seen that.
Most guys hate touching girls’ bodies.”
She looked me over with open interest and explained my role.
Then she added that, as the only male, I would be examined last—after every girl had finished—so none of them would see me naked.
“Alright, first person in line, come on in.”
The curtain parted and Chaerin stepped through, already completely naked.
Flawless white skin and the clear, sensual curves of her body.
I had touched every inch of her just yesterday, yet under the bright clinical lights she looked different—more vivid, more exposed.
Chaerin seemed conscious of my stare; a faint flush colored her cheeks.
Then, following the nurse’s instructions, she stood at perfect attention.
The real measurements began.
“Mm, skin quality is top-tier.
Excellent elasticity, even tone…”
The nurse pinched the skin of Chaerin’s forearm with a specialized device, murmuring as she checked the readings.
I stood quietly beside her, watching every inch of Chaerin’s body.
Next came the breast evaluation.
The nurse brought over a set of molds.
“Breast volume is F-cup.
Shape is excellent as well.”
The mold sealed snugly around Chaerin’s full breasts.
The monitor clearly displayed 75F .
Then it was time for nipples and areolas.
The nurse picked up a vernier caliper and carefully clamped Chaerin’s nipple between the jaws.
“Areola diameter and nipple projection length are in perfect proportion.”
I swallowed hard.
The precision down to the millimeter was impressive, yet knowing the subject was my twin sister left me with a strange, electric feeling.
Next the nurse produced a nipple color chart—dozens of subtle pinks and browns arranged like a paint swatch.
She held it against Chaerin’s areola and nipple, matching the shade.
“Color is a soft pale pink.
Nothing to criticize.”
At those words Chaerin’s nipples stiffened a little more.
Being evaluated like this in front of her twin brother seemed to embarrass and arouse her at the same time.
The nurse didn’t miss it and teased her mercilessly.
“Oh my, already getting excited?”
“N-no!”
Chaerin denied it in a flustered rush, but her proudly erect nipples told the truth.
The nurse then ordered her to spread her legs and lie on the nearby bed.
External genital evaluation.
“Come on, open a little wider.”
Hesitantly, Chaerin parted her thighs.
Between them her pretty pussy came into full view.
The nurse adjusted the light, studying shape and color.
“Labia minora are symmetrical, color is lovely.
Clitoral exposure is just right.”
She had Chaerin roll over, gently spread her buttocks, and inspected her anus.
“Anal wrinkle density and color both good.
Almost no pigmentation.”
The nurse handed Chaerin a small bottle.
“After every shower, apply this to your nipples, pussy, and anus.
That way you’ll keep this pretty color.”
So that was why the girls in this world stayed so free of darkening and stayed so beautiful.
Watching the intimate scene, I found myself thinking that every other girl here probably had equally pretty pussies.
Oral structure and flexibility tests followed.
Every part of Chaerin’s body received a top-tier rating.
Only one stage remained.
“Now we’ll begin the arousal-induction procedure.
Sihyuk, come over here and help.”
Finally, my turn.
“First we’re going to measure time to arousal.
The moment you start stimulating her, I’ll clock how many seconds it takes her to reach an aroused state.”
She handed me a long thimble-like device.
“Vaginal photoplethysmograph.
Slip it on your finger and touch her pussy—it’ll read arousal level and a bunch of other metrics.”
I fitted the strange instrument over my index finger and approached Chaerin, who lay with her legs slightly parted.
“S-Sihyuk…”
Her voice was tight with nerves.
The look in her eyes said she had never imagined her twin brother would be the one fingering her pussy.
The nurse watched the two of us with open fascination.
She had been checking items off on a sheet for Chaerin; now she smiled and made a request.
“Start by playing with her nipples, would you?
Some girls can’t feel anything there.”
I stepped in front of Chaerin and cupped her F-cup breasts in both hands.
Soft, heavy weight filled my palms completely.
Unable to resist, I rolled her stiff nipples under my thumbs.
“Hnn…!”
Her body trembled delicately.
My own heart was pounding just as hard with excitement.