Two or three weeks had passed and Spencer masturbated constantly, obsessively, every chance he got, every free minute he could grab. He spent too much time locked in the bathroom, and he slept very little because he'd be thrashing about in bed naked playing with himself, sometimes even until the sun came up.

He was happiest when caressing herself down there between the legs, fingering his little nub, and rubbing the tiny head, going absolutely deliriously mad with pleasure until he drooled and his eyes rolled back in his head and he was about to explode. Then he'd stop, lying there, drenched in sweat, panting for air, waiting for the inferno between his thighs to cool off, and then starting again, denying himself the release so he could build up to an even more intense one.

Other nights, he'd just masturbate on and on, eyes shut, picturing Carly's beautiful face, her amazing body and curves, and let his young mind go filthy with lusty fantasies until he'd cum. He'd imagine Carly masturbating just like he saw her do. Or he'd imagine Carly doing the kinds of things he saw in pornos, having sex with women, with men, with women and men, all sorts of unspeakably dirty things that people are not supposed to even know about, let alone think of.

Then he'd just keep going, and soon he would be getting bombarded with an endless chain of climaxes for hours, each time, thinking about Carly and no one else.

Spencer was starting to get worried that this was not normal. I mean it couldn't be, right? He read online that masturbation was normal and even healthy, but he wondered if there was some kind of limit to how much you should do it.

Also, all she could think about was Carly. He watched pornos online and whatnot but invariably his dirty little mind would always go back to Carly. So he would always end up writhing about in his bed, his skinny, naked body glistening with sweat as she rubbed his soaking wet little thing between his spread open legs with his fingers for hours, wondering how many orgasms it would take to cool it down, all the while imagining Carly's beautiful body, and Carly's giant penis.

Spncer was now a total slave to his tiny little cock. All day long it would ache and tingle madly for attention, soaking his underwear. All night long it would just take over. Her penis was out of control. And Spencer wasn't sure if this was really such a bad thing.

Carly was at her doctor's for another routine check-up. If you could call anything involving Carly's body routine or normal.

Dr. Jamie Gabriel had been Carly's personal physician since she was a baby, and her family doctor since before that. She had helped her through puberty and beyond, and was an especially gifted and intuitive doctor for Carly's particularly unique case. She was disarmingly friendly and charming, making her one of the few people Carly could feel perfectly comfortable around; which was helpful when she had to regularly get naked and get prodded and examined by her and whatnot. Carly considered her more than a doctor, basically a friend, and practically a trusted family member.

It was another physical, and Dr. Gabriel and her were going over the usual figures.

"Okay," Dr. Gabriel said. "Weight: 140 pounds. Although I think we know where the bulk of that weight lies."

As usual, Carly cracked up, giggling and turning bright red in embarrassment. Dr. Gabriel grinned mischievously and continued.

"You're 5 foot 6, your measurements are frankly ridiculous and I'd think you're lying if I didn't take them myself. Bust 39 inches, waist 29 inches, hips 36 inches. At least that's this week, because you're still growing. Next week we'll re-fit you for a bra just to be sure you're still wearing the correct size." She was a real stickler for her being fitted properly. She was concerned that if her breasts got any bigger, it could hurt her back and require reduction surgery. She was also unusually concerned about odd things like her blood pressure.

"It's because of your size," she politely explained. Her penis was so enormous and still growing. Dr. Gabriel explained that usually past the 11 inch mark, a penis would not actually get completely hard when erect because of the amount of blood needed for that size. Yet Carly's monster would get hard as steel. The doctor was worried about her passing out if she had a sustained erection. With Carly who knows what kind of odd side effects and health problems she was at risk for. Carly considered herself lucky to have such a good doctor. Lucky to have such rich parents to afford such a good doctor, she supposed.

"Okay, let's measure you," Dr. Gabriel announced matter-of-factly, and Carly stood up and began undoing her jeans. Once they were around her ankles and the bandage was off her thigh, she saw her doctor's eyebrows rise.

"So you're totally flaccid? Soft? Like, this is it as its smallest?" she asked, incredulous.

"Yeah, why?" Carly asked, shrugging.

"It's definitely gotten bigger since our last checkup three months ago," her doctor frowned, stretching out her measuring tape.

Moments later: "So, okay. Seven inches long when completely flaccid, and about three inches of girth. That's... insane. Most men wish they had those stats when hard."

Carly just shrugged as she sat on the examination table, now completely naked. As far as she was concerned, it was just a major inconvenience and hassle. She wished it were as small as possible. Everyone seemed to be obsessed with size. Men wanted huge dicks, women were jealous of her huge boobs. She couldn't imagine why, knowing what a pain either were to live with, let alone both at once.

"Okay, can you get it hard for me?" Dr. Gabriel requested, totally cold and matter-of-fact. They had done this before, so Carly sighed, lay back, wrapped her fingers around her cock and began stroking it. It was more a medical thing than anything else, it was hardly sexy. Still, it needed little encouragement; in no time she was nursing a massive, throbbing erection.

Moments later: "Jesus."

"What?"

"Well, haven't you noticed? You've clearly grown. It's now about 14 inches long. I'm not sure how your body can even support it, didn't think something like this was physically possible, let alone functional," Dr. Gabriel explained.

"Huh. How about that," Carly shrugged. Again, just a hassle, really. It's not like anyone would appreciate it. She pushed that thought out of her mind.

"Anyway, here, fill this up." Dr. Gabriel handed her a sperm sample cup.

An awkward moment of silence ensued.

"Um... I can't use that," Carly said.

"Why not?"

"It's... too small."

Dr. Gabriel stared at her. "Seriously?"

"Yeah," Carly said timidly. "I've... I'm producing... more than before." She glanced over at her doctor's desk. There was a coffee mug.

"You produce that much in a day?" Dr. Gabriel asked, incredulous.

"Well actually, it's more like... that much per session," Carly admitted.

"How many sessions do you have in a day?"

"Um, well, basically two or three."

"Oh. Okay. Well that's a little on the high end, but okay."

"Well... also..." Carly turned pink. "I usually... cum... more than once."

The doctor's eyebrows went up in her all-too-familiar look. Carly squirmed, embarrassed to admit it.

"When I... you know, do it, I usually cum at least twice or thrice. Sometimes more."

The doctor's eyebrows rose higher.

"I have to," Carly insisted. "If I don't I'll wake up in the middle of the night and... well, have to do it again. So usually, it's about twice or thrice. Sometimes a lot more."

Carly went on to explain that sometimes, she'd masturbate for several hours, constantly ejaculating every half hour or so, over and over. Other times she'd build it up for one big bang, only it would end up being a few of them together at the end. She preferred the latter because a few messes at once in quick succession was easier to clean up than repeated messes. Also, because it made the orgasm much more powerful and intense to build it up like that, but she skipped that bit.

A short while later, Carly was behind the privacy screen facing the wall, sitting on a stool, holding the coffee cup in one hand and massaging her throbbing erection in the other. After a few moments she let out a deep sigh of pleasure, and began whimpering softly as her heart and soul gushed explosively out through her cock and into the cup.

It was amazingly thick and heavy, and she came hard and long, slowly filling up the cup until she was squeezing the last drops of her orgasm out and the cup was almost completely full of pure, hot, syrupy, milky semen. Her hands shaking as she held it, for a strange moment she was almost overcome with the urge to put it to her drooling lips and swallow it down. But she shook it off and passed it to her doctor.

She started to put her clothes back on, listening attentively to her doctor's opinion.

"I'll take a close look at this," Dr. Gabriel said, referring to her enormous load, sealing the cup in sterile latex. "As far as I can tell, you're suffering no major ill-effects. Normally I'd say that indulging this much is unhealthy, but I think in your case it's the responsible thing to do. Your body is producing at a frankly impossible rate, and your hormones and natural urges are probably though the roof to compensate. This could be normal for your kind of body, but who knows, right? So in summary: keep at it for now, and I'll keep checking up on things and see if there's anything to be concerned about. So far, though, I think we're good, you're actually perfectly healthy, and I don't see anything to be worried about."

As Dr. Gabriel closed her file, there was a knock on the door and her front desk receptionist, Jessica, peered in. "Mom," she said, "Call for you on line two. Also, I'm gonna take my lunch break now."

"Fine," Dr. Gabriel said, and answered the phone.

Her daughter was just past Carly's age and worked part time at her mother's practice. They had known each other for most of their lives, same school and all that, but were just acquaintances, not exactly friends. Carly liked her enough. Jessica looked over at Carly, flushed slightly, and said "Hi, Carly," and disappeared back behind the door just as Carly smiled and waved.

Dr. Gabriel was on the phone dealing with a fussy patient. As Carly went to pick up her backpack, she froze in horror.

Her jeans were undone and wide open. In her lap lay her giant penis like a huge fleshy soft third leg between her thighs, the glistening head resting just short of her left knee. She was distracted by talking with her doctor that she hadn't finished doing up her clothes. Shit! Had Jessica seen it? Her mind started racing. She probably hadn't. But what if she had? Would she tell anyone? Unlikely, her mom is my personal physician, wouldn't that get her in huge trouble? Also, she'd been treating me for years. And Jessica had been working at the clinic for years, who's to say she didn't already know from sneaking a peek at her file or something? Who knows?

A sick knot tied up the pit of her stomach.

When she was done, she left the office and made a beeline for the door, face bright red, trying to hold it together. What a disaster.