Older, chubby man

The doctor who enters is a bit surprising, he is a gray headed man with glasses and a chubby belly. Around his neck he wears a shiny gold necklace with a letter "A" emblem. Instantly you know his secret. The only men who can get away with looking like him and maintain Alpha status are packing.

"Good afternoon, Derek and Marcie, I am Dr. Grant," he said politely. "Happy birthday."

"Thank you, sir," you say.

"Honestly, this is the first time I've sorted twins," Grant said. "I'm quite excited."

You and your sister look at each other and shrug.

"Don't be nervous, I do this a thousand times a day," he said. "What I am going to need is for you both to stand up and disrobe...completely."

"Both of us?" Marcie askes. You already have your shirt off.

"Thats how this works," Grant said with a smile.

"Its okay, sis," you say supportively. "You had to see me naked this morning, now I have to see you."

She looked at you and rolled her eyes again, but started undressing. You watched curiously as she started unbuttoning her shirt. When you were babies the two of you had bathed together and when you got a little older you had even played doctor a few times. Nothing sexual, just the normal childly curiosity, but you hadn't seen her naked since before puberty hit.

After a moment she removed her shirt, folded it and lay it on the exam table. She stood there for a moment in just a pink lace bra and jeans. She took a deep breath and started removing her pants. She leaned slightly forward as she dropped them to the floor, and for a moment you found yourself staring at her big ass, which was covered by nothing but a pink thong that matched her bra.

Dr. Grant watched her eagerly as she removed her bra, revealing a pair of a-cup breasts that out of place witt the rest of her body. However, they were capped off with two larger than normal nipples, both of which were currently rock hard.

As she removed her panties, you were surprised to find a complely natural, unkempt bush. Even the doctor seemed a little surprised but turned on by it.

"Thank you," he said after staring you both up and down for a moment. "Then next part is a little...uncomfortable but its just part of the process."

First he reached out and grabbed both of her small breasts, carefully gripping each nipple between a thumb and index finger and causing Marcie to moan softly. Then he dropped to his knees in front of her, put his face close to her hairy pussy and breathed deeply. After savoring her scent for a minute, he reached up with one hand to part her pubic hair, then without warning plunged his middle finger into her.

"No hyman," he observed. "How old were you when you lost your virginity?"

"12," she said nervously. He seemed unphased, but you were shocked. Your twin sister lost her virginity a full year before you.

He withdrew his finger, got back to his feet, grabbed his pen and jotted a note.

"How many partners?"

"Three," she said.

"Good...good," Grant said, jotting down more notes. "Now, I need you to turn around and bend over the exam table."

Clearly embarrassed, Marcie did as she was told. Grant observed her big ass for a moment, then gripped a cheek in either hand and spread her open. He leaned down as if examing her asshole.

"Ever had anal sex?"

"Excuse me!"

"All part of the process," he said absently.

"Yes...yes, I have had anal sex," she snapped.

"Okay, I've reached a decision," Grant announced quickly. Then added, "Marcie, you can stand up for this part."

"You mean you don't have to grope his cock or play with his ass?"

"Well, no, I mean his big cock speaks for itself," he said. Marcie made a clearly irritated face.

"We've got good news and bad news," he continued. "Derek, you are clearly a natural Alpha. Congratulations."

"Thanks," you said with a smile.

"Sometimes genetics can be very funny," Dr. Grant said. "Here we have two twins. One is clearly an Alpha...the other is not."

You can see tears welling up in your sister's eyes.

"You are so damn close though, Marcie," he continued. "We use a very complicated scoring method. You have a nearly perfect ass, although you lost pounts because of the anal sex. Your nipples are beautiful, but you're relatively flat chested. All summed up, you come in as a high Gamma."

"Gamma!" she cried.

"Shhhhhh," he said. "I am not a heartless man, Marcie. Let me offer you a deal...."