End
Kimberly groaned unhappily as she threw her pencil down at her Anatomy notebook. "This is ridiculous!" she protested. "How am I supposed to learn all this?!"
"What exactly are you having problems with?" Billy asked gently.
"Anatomy," she answered. "I just don't get it."
"What part of anatomy is giving you a dilemma?" he asked further. "Musculature, bones perhaps? I remember I had a hard time learning all the ridges and such for the pelvic bone."
Blushing slightly, Kimberly answered, "Male sexual system."
Billy found himself blushing in concert with her.
"Say, Billy, do you think you could help me with this?" Kim asked suddenly.
"M-me?" He gulped at that look on her face; that look had led to his sexual exhaustion on more than one occasion. Although he had been intimate with his teammates on numerous occasions, Billy was still a little unsure of himself when it came to girls and anything having to do with sex, especially Kimberly. Trini made him feel secure; Kimberly, despite being more exciting, made him feel very nervous. Not that that was always a bad thing, but it sure could keep a steady current of butterflies in his stomach.
"Why not? After all, you already know the equipment," Kim reasoned, smiling brightly.
Unassailable logic if ever he had heard any. Keenly aware of his elevated pulse rate, Billy considered her request. He could think of no good reason to refuse her; he was always happy--and willing--to share his knowledge with others. Besides, it might even be enjoyable to tutor her on this particular subject. Kimberly was an apt pupil.
"Okay," he agreed, "but why don't we go somewhere else? Somewhere a bit more private."
"Oh? Just what are you planning on teaching me?" Kim queried mischiveously, knowing full and well what she was about to get Billy into.
"I thought that perhaps you might prefer some hands-on tutoring," he replied somewhat sheepishly.
"Hands-on beats a textbook every time!"
They retreated to a dark corner of the library and teleported away in streams of blue and pink light, rematerializing a second later in Billy's bedroom. For a moment they simply stood there looking at each other.
"So, now what?" Kim wondered.
"Um . . . you can sit on the bed. That'd be best."
"You're so cute when you're nervous," Kim giggled. "Don't you think you should get undressed or something?"
"Right."
As Billy unhooked his overalls, Kim offered, "I'll undress, too. Fair is fair."
"You d-don't have to," Billy stammered nervously.
"Maybe I want to," Kimberly teased, smiling to herself. She felt the first tremor of warm, sexual energy spread through her as Billy removed his shirt. He was surprisingly muscular under his somewhat nerdish facade. She quickly undressed, placing her clothing in a neat pile beside the bed. She watched as Billy stripped down to his white briefs, distended with his erection. Enthused, Kimberly leaped onto the bed, rocking it. "Care to join me?" she asked.
"How extensive will your test be?" Billy asked, his nervousness fading somewhat as he slipped into lecture mode. "Will you need to know external or internal?"
"Both."
"Okay," he said, removing his briefs. Kimberly felt her heart leap when he was finally standing before her, completely nude. "Scoot over, I'll lay down beside you and explain everything," he informed her.
As he stretched out beside her, he took her hand in his. "Obviously, this is my penis," he said, taking her hand and placing it on his cock.
"Have you named it?" Kimberly teased, tracing down its length. Looking at his face, Kimberly saw that his cheeks were burning red.
"No," Billy stammered. "Most erect penises are within the range of five-and-a-half to six-and-a-half inches."
"How long are you?" Kimberly queried, catching his gaze.
"I'm a little bit over six inches," he said, "but most aren't as wide as mine."
Kimberly was used to his impressive girth, but it still impressed her. He was almost as wide as three of her fingers pressed together. She wrapped a powerful hand around his cock and started to stroke vigorously, only to be stopped.
"This won't be on the test," Billy said, "but just so you know, if a guy is circumcised, you can keep him from getting sore by using lubrication. It can be virtually anything: saliva, prec-come if there's enough, lotion . . . . A dry hand on a dry glans can cause . . . well, chafing. It's a bit painful."
"Like dry fingers on a clit?"
"Sort of," he said. He reached into his nightstand and pulled out a bottle of lotion. He spread just a small amount on his hand and then transferred it to his cock, just enough to make it slippery. He guided her hand to the head of his penis.
"Now can I play with it?" she teased. She couldn't help but smile at the even darker red that flooded to his cheeks.
"You're acting like you haven't before."
"Well, I haven't," Kimberly said. "I mean, sure, I've sucked you're dicks, and you've all fucked me, but that's about it. I haven't really been given a chance to explore. But, teach me, Doctor Cranston."
"This is the glans," he said. "If I was uncircumcised and flaccid, it would be covered with a foreskin. It's just what it sounds like, a hood of skin." Billy was having a hard time keeping his voice steady. Kimberly was slowly sliding her hand up and down his cock, paying particular attention to the head.
"Is this the same thing as come?" she asked, sounding not playful but actually inquisitive as she eyed the tiny drop of clear liquid forming at his opening.
"No, that's fluid from the Cowper's Gland," Billy answered, "but it still contains sperm. That's why the withdrawal method isn't an adequate method of birth control."
"Really?" Kimberly asked. "I didn't know that..."
"It's not really a problem for us, though," Billy said. "It will only affect us as long as we have the power, but we're all sterile. Neither sperm nor ovum will complete the meoitic pathway of maturity, but it isn't permanent. I have already run extensive testing." It was getting harder and harder to concentrate with Kimberly slowly stroking his aching cock. "Now, this opening here is the urethra. It's a narrow tube that runs the length of the penis, and is where urine or semen exits. Now squeeze a little bit... mmm... there."
"Does that feel good?" she asked, blowing lightly in his ear.
"That feels positively blissful," Billy sighed. "Kim, slow down. If you don't, I'm going to ejaculate prematurely." Kimberly arched an eyebrow at his language, but she did as he asked. However, she didn't remove her hand. Instead, she just held him by the shaft. "Now, those are cylindrical bodies of erectile tissue. It's basically just spongy tissue that is filled with tiny blood vessels. When a man gets aroused, these engorge with blood. The ones on top are both called the Corpora Cavernosa. This one, the one that runs along the bottom, is called the Corpus Spongiosum. On some men, the Spongiosum is really obvious. It'll show up as a ridge of flesh that runs from the base of the penis right up to the glans. On some people, like Zack, it is really obvious."
"This here?" Kimberly asked, tracing the side of her finger down the bottom of his cock.
"Yes!" Billy cried, suddenly overcome with full-body wriggling. "Please Kim, stop that!"
"Sorry," she laughed. "I didn't expect to see such a reaction. Please, continue."
"Now the Corpus Spongiosum is actually what makes up the glans. It just sort of spreads out at the end of the penis." He took her hand and guided it lower. If her hand had stayed on his cock much longer, he would have come all over her. "These are the testes," he said. "This lump behind them... that's the epididymis, and this cord there... oh, not too hard..."
"Sorry."
"That's the spermatic cord," he told her. "Now the vas deferens runs up through the spermatic cord. Sperm are actually produced in the testes, but they mature in the epididymis. The vas deferens carries the sperm that are released by the epididymis. Semen is produced by combining the sperm, which constitute a very small portion, with fluid from the prostate gland and seminal vesicles. The most important constituent is fructose, which keeps the sperm alive. I think that's the male sex organs in a nutshell."
"No offense, Billy, but you just totally sucked all the fun out of your cock," Kimberly commented. "But, we also have to know the stages of arousal. Think we can make that interesting?" She wrapped her hand around his cock and began to pump her fist up and down again.
Billy sighed his approval. "The first stage is arousal," he said. "That's when a man feels horny." Kimberly giggled at his interjection of blunt language.
"Second stage is plateau," he continued, pausing to moan heavily. "That's where I am, right now. Penis is at its largest size and testes elevate.
"Next is orgasm, and last is resolution, when the penis returns to its flaccid state."
"I think I'm in the plateau stage myself," Kimberly told him. Her hand was moving up and down his cock faster and faster. A few tiny droplets of clear liquid oozed out of his cock. However, Kimberly's movements were almost entirely mechanical. She was watching Billy's body. His face was flush and his nipples were rock hard. His cock was almost hot to the touch.
"I'm about to come, Kim!" Billy warned.
"Should I change what I'm doing?" she asked.
"No," he sputtered. "Go faster and harder."
Kimberly did as she was asked, tightening her grip and moving her hand faster. Billy's chest was heaving, and he started to rock. Suddenly, his cock spasmed, his balls drew up even tighter, and milky-white semen shot out of him. Kimberly continued to stroke him, even as the thick liquid spilled out onto her hand.
"Now you can stop," Billy managed. "If you keep stroking a guy's cock after he's come, he'll lose his mind. Seriously. Oh wow. Thank you, Kim." Smiling, he said, "That's the most fun I've ever had tutoring someone."
"You know, next week we're going to be learning about the female body," Kimberly said.
Grinning, Billy asked, "Want me to tutor you?"
"I was hoping you'd offer," Kimberly smiled as she urged Billy between her legs.
Billy slid an appreciative hand down the curve of her thigh. "Now this," he said, "is-"
"Billy?"
"Yeah?"
"Just eat me."