“Well, let’s see…penises come in all sizes and shapes. They’re almost as individual as faces are. From what I’ve read, mine is a little bigger than average, so most are smaller than that…but as you saw in my magazine, some are way bigger, too,” Ron said.
“Uh-huh…” Amy murmured, nodding.
“They also tend to come in two kinds: ‘showers’ and ‘growers’,” Ron continued. “Some guys are ‘showers’, meaning, their dicks are always pretty much the same size. They just get hard or soft, but they’re always ‘showing’ everything they’ve got. I’m more of a ‘grower’, though. When my cock is completely soft, it’s not very big, but when I get a hard-on, it ‘grows’ more than twice as long and much bigger around.”
“Ummmm…yes, I’ve noticed that!” Amy murmured, her eyes carefully studying her brother’s erect penis as he talked. “Watching it do that is so exciting! I don’t know if just seeing a dick get hard, without it getting any bigger, would be as, uhhh…stimulating…”
“Yeah…well…I’ve always kind of envied the ‘showers’, though. I love the way it looks and feels to walk around when I have a semi-hard-on…the way it flops around all fat and heavy. It must be cool to have it like that all the time…”
He paused in thought for a moment. “Maybe that’s an evolutionary thing, too,” he mused. “It might have been safer, a million years ago when people didn’t wear clothes, to have your dick be little when it was soft, rather than having a big, fat cock sticking out there in the open all the time, swinging around and getting caught on a thorny bush, or torn up by some wild animal while you’re out hunting…”
Ron paused and just watched as his sister gently stroked her fingertips up and down the side of his upthrust shaft while she stared at it in fascination.
“So…why are some cocks so much bigger than others when they’re hard?” she asked.
Ron chuckled. “Fuck! Who knows? That’s like asking why some women have big, floppy tits while others have cute, little ones like you!”
Amy smiled and nodded.
“I do know that humans have the biggest dicks, relative to body size, among all the primates, like gorillas, chimpanzees, and monkeys.
“And that’s your fault!” Ron said.
Amy looked up at him, her brows knitted in puzzlement. “Me? What did I have to do about it?”
Ron laughed. “Yeah…human females just seem to prefer big dicks!”
Amy giggled.
“That’s right!” Ron continued. “During cave-man days, since the women preferred men with bigger dicks, the guys who had big dicks got more chicks than the little-dick guys. Therefore, the big-dick guys passed on their big-dick genes to more babies than the little-dick guys did. Eventually, the average human dick was bigger than the average chimpanzee or gorilla dick, relative to the size of their bodies.”
Amy laughed at her brother’s attempt at a scientific answer to her question.
“There’s still an island somewhere in the South Pacific where everybody walks around, naked, except that the men wear these things called ‘penile sheathes’.” Ron said. “They’re these long, hollow tubes made out of wood or leather or something that they stick their dicks into. They tie them on with strings around their waists, making them stick up, looking like they have giant erections all the time. I guess the bigger and longer it is, the more status the guy has in the tribe.”
Amy slowly shook her head, smiling.
Cocking her head to the side, she peered down at her brother’s scrotum. Slipping her hand under it, she lifted his balls. She gently fondled, poked, and prodded them with a finger from her other hand. Ron groaned and his ass squirmed.
Amy looked up at him. “Is that all right, Ronnie?” she asked, concerned.
“Oh, yeah…” the boy replied, clenching his butt and thrusting his cock and balls upward. “It’s not as good as when you touch my cock, but, as you play with my cock, it’s nice if you stop and play with my balls little bit…or, both at the same time is good, too…”
He groaned and squirmed. “You have to be careful with them, though…they’re very sensitive to pressure. While it feels really good when you play with them, if you do it a little too roughly, it can easily become uncomfortable, or even painful.”
As Amy continued to gently fondle his testicles, Ron said, “As you’ve may have noticed, my ball-sack changes a lot, like when I go in the pool, it gets tight and firm, but in the sun it gets real soft and dangly.”
“Uh-huh…” Amy nodded, “I noticed.”
“That’s because sperm are temperature sensitive,” Ron said, returned to professor mode. “In order to keep them viable, when it’s cold, your ball-sack tightens up and pulls your balls close to your body to keep them warm, and when it’s hot, it loosens up and lets your balls dangle free, to cool them off. Natural air-conditioning. My scrot’ is kind of half-way in between right now.”
Amy, while continuing to fondle his balls in one hand, began running the fingertips of her other hand up and down along the side of his rigidly upthrust shaft.
Ron groaned and his butt squirmed.
Amy raised her eyes to look at her brother, smiling. “How come you know so much about dicks, Ronnie?” she asked.
Ron laughed. “Because I have one, of course!” he replied. “If there’s one thing you need to know about guys, it’s how important their dicks are to them. So, since I’m a guy, and my dick is very important to me, I’ve done a lot of research on the subject.”
He smiled with amusement, as he watched his beautiful sister lovingly caress his throbbingly erect penis. She appeared quite fascinated by it, as well.
“Oh, yeah…” Ron said, off-handedly, “I happen know a lot about pussies, too…”
Amy looked up and smiled. “Oh, you do, do you?” she said.
“Yeah, uhhh…parallel research,” he chuckled. “I’m actually very interested in pussies, as well.”
“Well, I’m certainly happy to hear that!” Amy giggled. “It would be weird if you were only interested in dicks!”
Amy gently wrapped her hand around her brother’s upthrust shaft and slowly slid it up and down several times. Ron gasped as a shiver ran through his body and he felt a tell-tale tingle deep in his belly. Afraid that he was losing control of his Tantric training, he quickly sat up, pulling his genitals away from his sister’s hands.
“You sit up here, now,” Ron said.
He helped Amy reposition herself so she sat against the headboard, propped up against the pillows. He left the room and returned a few moments later holding a hand-mirror. Amy smiled at the sight of her brother walking into the room, his penis still stiffly erect, pointed slightly upward from his crotch, bobbing and swaying as he moved.
Ron crawled onto the bed at Amy’s feet. Grasping her ankles, he pushed her feet back, bending her knees and splaying them outward. He pushed a pillow beneath her ass to raise it even higher.
“Have you ever taken a really good look at your own pussy?” he asked.
“Uhhh, well…what do you mean by a really good look?” she answered hesitantly.
“Like this!” he said, holding the mirror above the girl’s now wide-spread crotch.
“Here, you hold it…so you can get the right angle,” he told her.