"First, I'd like you to lean back on the table and spread your knees. Just let them fall open," Dr. Wilkes instructed. While Avi did as instructed, Dr. Wilkes and Mr. North both pulled on rubber gloves. "That's clearly labia and a vaginal opening," Dr. Wilkes remarked to Mr. North, as he ran his finger from the underside of Avi's dick down to their vagina. On instinct, Avi pulled their knees together.
Mr. North's firm hands pressed them back apart. "Keep them open," he instructed firmly.
Dr. Wilkes' finger was pressing against Avi's vagina now, prodding it, slipping inside. Avi was already so wet that there was no resistance as he slipped in, poking and rubbing. He clearly knew what he was doing; he almost instantly found Avi's g-spot. Avi tried to lie still, but they couldn't help arching their back an wiggling their hips as the doctor thrust against the sensitive stop. "They're hornier than most," Dr. Wilkes said, approvingly. "That's a good first sign." Mr. North grunted in agreement. With Dr. Wilkes' fingers still inside of them, Avi felt another hand grasp their cock. It was still hard, and now, with Avi lying on their back, it stood straight up, precum glistening on the tip and where it had dripped down the sides.
"It's small, but it's hard as a rock," Mr. North observed. He slid his hand up and covered the tip, making Avi gasp. Using his fingers, he gently spread the precum along the length of the shaft, then rubbed his hand up and down. Avi couldn't help it--they groaned this time, desperately trying to get their erection down. They tried thinking of dead cats, rotten food, the way mud got under their fingernails when they worked in the garden--nothing. They could feel themself throbbing under Mr. North's grip and Dr. Wilkes' prodding. Then, the touch abruptly disappeared.
"Avi," Dr. Wilkes instructed, "We're going to measure your responsiveness to different kinds of stimulation. So far, it's clear that you are aroused by both external and vaginal touch. We're also going to assess your responsiveness to oral and anal sex. For this part, you will need to kneel on the floor in front of Mr. North and give him a blowjob. We'll be checking not only your skills in this area but also how it affects your own arousal."
Avi was past the point of blushing--they had never been so exposed in their life. They also weren't sure they'd ever felt so hard. "Okay," they acquiesced, sliding off the table. Kneeling in front of Mr. North, they waited. Were they supposed to unbuckle his jeans? Would that be too forward.
As if reading their mind, Mr. North spoke. "You can take me out," he said, spreading his legs slightly. Avi reached up and unblocked his belt, sliding it open but leaving it in the waist of his pants. Then, they unbuttoned his fly and unzipped him. His briefs were silky smooth, a comfortable knit that hugged his crotch and rather generous bulge. Avi pushed the pants down his hips a bit, then pulled on the waistband of his briefs and slid it down with one hand while lifting his cock with the other. It was huge--Avi's hand barely wrapped around it, and it was still soft. "Don't forget the balls," Mr. North instructed. Avi pulled the waistband down farther and reached under the cock to grasp his balls. They held the heavy sac in their hand, gently rubbing it to feel the distinct outlines of each testicle. While Avi had a cock, they didn't have balls, and these were a new experience for them.
Shoving aside the bashfulness that often overtook them, they began to play with Mr. North's cock and balls, stroking gently with their fingers from the base of the soft, limp organ to the glans, covered by the foreskin. As they stroked and rubbed the balls between their fingers, they felt his cock begin to grow. No longer limp, it became firmer and larger, the glans starting to protrude from the foreskin. "Use your mouth now," Mr. North commanded. Avi opened their mouth, then hesitated. Where to start? Sticking out their tongue, they gently licked the tip of his penis. As they swirled their tongue around it, they tasted the slightly salty, sour taste of his precum. Growing bolder, they took the whole tip in their mouth and sucked gently, being careful to keep their teeth out of the way. They flattened their tongue against the growing dick and slid more of it into their mouth, fluttering their tongue against it as they took more of it in. "Suck on my balls," Mr. North directed, leaning back and sliding his penis out of Avi's mouth. Avi obeyed, reaching up one hand to grasp and stroke the hard, glistening cock as they took one testicle into their mouth, swirling and sucking, and then the other. They tried to fit both inside their mouth, but the balls were growing quickly and they couldn't do much more than suck on them when they got them inside. In their hand, Mr. North's cock was rock hard and a consistent dribble of precum dripped onto Avi's face and forehead.
Suddenly, Mr. North grabbed Avi's head, tangling his fingers in their short cropped curly hair. "Open up," he commanded, jerking their mouth off his balls and grabbing his dick from their hand. Expertly, he thrust his throbbing cock into their mouth, shoving it deep. Avi gagged and tried to press against him to give themself space to breathe, but his grip was firmer. "Relax your throat," he commanded. His thrusts were faster now, and Avi struggled to get a breath between the cock being rammed back down their throat. With one last grunt he shoved his dick as far down their throat as he could and held their face against his crotch, their chin pressed into his balls an their nose buried in his happy trail as he shot load after load of cum down their throat. Avi was gagging, but Mr. North held them firmly. He slowly eased their mouth down his dick enough for them to swallow, which Avi did, on his command, several times. Finally, they had swallowed all of his cum, and he released their head while commanding them to clean his dick. Avi lapped studiously at his cock until every last drop of cum had been licked off. Still a bit lightheaded from the lack of oxygen, they rested their palms on their thighs and let their head drop as they caught their breath.
"Time to stand up, Avi, and put your hands behind your head," Dr. Wilkes said, lifting Avi's arm with a firm pull. Avi stood and laced their fingers behind their head, wondering what came next in the process. Dr. Wilkes fingered their dick, which was still as hard as it had been before Mr. North had fucked their throat. "Clearly you didn't mind that," he chuckled. "Now, let's see how you take it in the ass. He spun Avi around to face the exam table and then pushed their upper body down so they were bent across it. Avi heard pants unbuttoning and a zipper being slid down before cold, slimy, lubed fingers prodded their asshole. "Pull your cheeks apart for me," the doctor commanded. Avi obeyed. The doctor's fingers pressed against Avi's pucker and then, with a slightly painful pop of pressure, he slid two of them inside. Avi gasped and wriggled, but Mr. North rested his heavy hand on their back and they couldn't escape. The doctor's fingers were thrusting, prodding, seeking out an incredibly sensitive spot in Avi's anus that had grown since they started testosterone. As Dr. Wilkes thrust against it, Avi screamed--they tried to stifle it, but the combination of pressure and pleasure overpowered their resolve. At the same time, Mr. North grasped Avi's dick and slid his hand up and down the slick shaft still coated with Avi's precum. Helpless, Avi exploded under their hands, shooting rope after rope of cum, their pussy dripping as well, their ass squeezing Dr. North's fingers uncontrollably, bright spots flickering across their closed eyelids as they collapsed all their weight on the table and cried tears of absolute bliss.
When Avi came back to their senses, they realized that they were still draped over the exam table. Dr. Wilkes and Mr. North were in the office across the way, the door cracked open. Avi slowly stood up. Their ass and mouth both hurt, stretched and still dripping with lube and cum.