This story is completely fictional. The characters are all age 18 or over. Reader comments appreciated.
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At the age of 18, Ariana Pohle stood 6 foot tall and weighed 110 lbs. If you didn't know she was a swimmer you might think she was anorexic, but she wasn't. She was all muscle under her very soft, pale skin, the result of working to develop long, lean muscles except in her wide shoulders.
She wore her bright red hair cut very short so it would not cause problems under her swim cap. Her eyes were emerald green and her complexion was lightly tanned because when she was not in the outdoor pool she tended to avoid the sun. She had developed breasts, such as they were, one year earlier, and seldom wore a bra.
Her older brother, Nick, 19, at 5 feet, 10.5 inches tall and 155 pounds, was neither as tall nor as skinny as his sister, but was very slender as well, as he swam for the high school and college swim teams. His hair was darker, almost brownish, and his eyes were sapphire blue. He not only looked up to his sister when she stood next to him, he also idolized her because she was more advanced academically and socially than he had been at her age.
So when, out of the blue, his sister called to him, to ask for help with her homework, Nick was shocked. Nevertheless, he went to her bedroom, knocked on the door, and walked in without waiting for her invitation. "What do you want, 'Bean?'" Nick asked. Only her family and teammates were allowed to call her that, and never in public where she insisted on being called "Ari." She looked up from her computer and said, "I don't understand this reading for sex-ed. Will you read it? Then maybe you can put it into terms I'll understand."
Nick read through the text, which was describing how the male impregnated the female through sexual intercourse. The more Nick read, the more embarrassed he became. "What's wrong, Nick?" she asked. "What don't you understand about this, Bean? You've seen dogs and other animals mating, haven't you?" he asked.
"Well, no," his sister replied, "not really. Are they saying that a guy sticks his thing in a girl and she becomes pregnant? Why ever would he do that? How does she become pregnant? Can he do that to her without her getting pregnant? This stuff is too technical, and I really want to understand."
"Mom should have explained this stuff to you when your body started to mature," Nick told her.
"Well, she did mention stuff about body modesty and how to take care of myself when I have a period, but that's all. She said "Don't have sex with a guy unless you want to get pregnant, but she never said why or how."
"Okay," Nick said. "Let's start with this. As you said, when a guy sticks his 'thing' in a girl, she may become pregnant. But it isn't guaranteed to happen. And by the way, let us be direct in our language. The guy's 'thing' is called his 'penis;' it is also called by many not-so-polite terms. Between you and me, for this discussion we'll call it his 'cock. And where he puts it in a girl is called her 'vagina. Between you and me we'll call it her 'cunt.' The act of a guy putting his cock in a girl's cunt is called 'sexual intercourse;' but we'll just call it 'fucking.'"
"So, between us, this is about a guy fucking a girl by putting his cock into the girl's cunt? she asked him. "Yeah," Nick replied. "But understand that you should not use those terms with anyone else but me. "Okay," his sister replied.
"Now, when a guy fucks a girl, she doesn't automatically become pregnant, Ari." She was almost shocked that her brother had called her by her public nickname instead of her private nickname. Nick continued, "There are many reasons why she would not. He could be wearing a condom. She could be taking birth control pills. It could be the wrong time in her menstrual cycle. Do you understand what I am saying?" he asked her.
"Not entirely, Nick" she answered. "I know about birth control pills because Mom had the doctor put me on them to regulate my periods, but when we went to the pharmacy, she asked for my birth control pills. What does that mean?"
"Ari," he told her, "those pills do both at the same time. They prevent you from becoming pregnant by regulating your periods. Usually a woman (or a girl) can only get pregnant during part of her cycle, usually in the middle of the cycle. The pills regulate her cycle so that, when she is not taking them, she knows when she is most likely to become pregnant if the guy does not use a condom. But when she takes the pills it is unlikely that she will become pregnant."
"You've mentioned condoms twice," his sister said. "What are they? How do they work? Why does the guy use one?"
He thought about it for a few seconds, and said, "A guy puts a condom on his cock for two reasons. One is to catch the sperm that comes out of him so it can't make her pregnant when they fuck. But also, it serves as some protection from sexually transmitted diseases, whatever they are. See, I don't know everything. But if a guy is going to fuck a girl he doesn't know, he might be afraid of getting one of those diseases from her, so he uses one to prevent that. And if he knows that he has one of those diseases, he could use a condom to keep her from catching the disease from him."
"But what is a condom, and how does he use it?" his sister persisted. He told her, "A condom is a thin piece of rubber or some other substance shaped sort of like a guy's cock. It usually comes in a foil packet, rolled up. He takes it out of the packet, places it on the tip of his cock, and rolls it down until his cock is covered."
"Okay," Ariana replied, "I think I understand. So, if you were going to fuck me, and you did not know that I am on the pill, would you use a condom to fuck me?"
"My beautiful Ari," Nick answered immediately, "I would never fuck you, because you are my sister, and guys are not supposed to fuck their sisters. But if you were not my sister and I wanted to fuck you, then, yes, I would use a condom to keep us both safe."
She then startled her older brother by asking the one question he hoped she wouldn't ask: "Nick, if I'm your sister, and you love me, why wouldn't you fuck me?" Then she made it worse: "Aren't I beautiful enough for you? Do you have a girlfriend who you would rather fuck than me?"
"Look, Bean, I love you more than anyone else. No, I don't have a girlfriend who I would rather fuck. It is as I already stated; guys aren't supposed to fuck their own sisters. It just isn't right." Nick looked upset as he answered her.