It took a second for Jo to realize Dawn was joking, and smile, before her sister continued "So instead of getting someone to fill up that empty feeling, most girls – and I mean almost all of them – choose to do something else, like touch themselves. Enough, maybe, that they get a good feeling; or even more, so that they have an even better feeling that's called an orgasm or climax. Or a girl might just feel that one part of her body or another feels like it needs attention – like maybe her nipples or boobs. It might be that she just wants to be kissed and touched. What a girl might feel at one time or another could be almost anything… remember, her body is busy making all this stuff to change her from a girl to a woman, and how much of what her glands and things are making is almost always changing. And like I said, when she's just starting out, her body isn't very good about making that stuff, so there's almost always a bit too much or too little of something. You remember last year, when Dad decided he wanted to start making his own fishing lures?" The younger girl had to laugh; his first few attempts were unusable, and he was sometimes left with paint on his fingers, or a feather or other decoration stuck on his hand. Once, he had to go to the doctor to get a fishhook removed from his ear – something that the rest of the family teased him about for months. But he kept at it, and the results gradually improved. "Your body is kind of like that, right now. Sometimes Dad got glue in his hair; with you, it's easier for you to get pimples. Dad used the wrong colors sometimes; you aren't happy with how big your tits are, yet. See what I'm getting at?"
Nodding, Joanna answered "Yeah, I do."
"Something else I want to tell you is that you don't have to try and go through all this by yourself – not knowing if what you're feeling or doing is 'right'. Just like Dad would read magazine articles with instructions about how to make fish lures, it's okay for you ask for help with the stuff that you want to know. You don't have to be ashamed or embarrassed about it, either. Like I said, you're not the first or only one to go through all that, and you don't have to do it alone and try to figure out everything by yourself."
"Wh… what do you mean?"
"I mean just what I said. It wasn't long after I started getting tits and hair that I started touching myself, and I'll bet you're doing it, too." Mortified that her secret was out, Joanna couldn't face her sister, choosing to stare at her lap, instead. But she could still hear as Dawn told her "You don't have to be embarrassed, Jo. I just said that I did it, too, remember? From what I've read in magazines and books, everybody does that. It's perfectly normal, and it's okay – you aren't doing anything 'wrong', and it isn't going to hurt you as long as you're even a little bit careful."
"R… really?"
"Yeah, really. If it wasn't, do you think I'd be willing to prove it by doing this?" Dawn answered, before standing up and letting her dress drop to the floor. Having removed her bra and panties as soon as she'd gotten home, she was left standing there stark naked, as Jo saw when she raised her head in response to seeing Dawn's dress fall. Wide-eyed, she continued to watch as Dawn calmly sat down again, then turned and rested her back against the headboard – and calmly lifted and spread her knees, leaving the younger girl with a clear view of the older's sex.
Then, much to Jo's amazement, she watched as Dawn slowly moved a hand between her legs and began running the end of one finger along her cleft. It wasn't but a few seconds until Jo could see that Dawn's clitoris was starting to make an appearance above her slightly-parted labia. As the younger girl watched, her sister's vaginal lips got slightly longer as the area between them became visibly moist. Dawn's actions slowly shifted from sliding her finger between her vaginal folds to paying more and more attention to the nubbin of flesh at the top. As Dawns activities increased there, Jo could see her older sisters labia grew even more, and darkened in what was obviously increasing arousal. Looking a little higher, it was plain as could be that Dawn was enjoying what she was doing: her breasts were visibly tight, with the dark knobs of her nipples standing out like little erasers.
So fascinated was she by she saw of her sister (and what she was doing!), Joanna jumped a little when Dawn next spoke to her, saying "Jo? If you want to look at me – you know, closer – it's okay. I know I'm older than you are, and don't look the same, but I think you'll see that I'm not all that different, either. And if you want to take your clothes off, I can help show you how you can make yourself feel better. I know it feels good when you touch yourself like this, but I can help you learn how to make it feel even better."
Seeing the doubt on her sisters face, and how she was hesitating, Dawn said "Really, Jo, it's okay. I'm a girl, too, and your older sister; I told you that I've already been through what you're experiencing now – I love you and trust you enough that I'm willing to do this so you can see that you don't have to be ashamed or anything. Can you love and trust me enough to let me help you learn?"
Several seconds ticked by before Joanna finally reached for the buttons on the blouse she was wearing. Her hands were trembling slightly, but she managed to get them all undone before slipping it off. Underneath, she was wearing a plain, white fabric bra; Dawn could see that Jo's breasts weren't yet large enough to need anything more than what she considered to be an "advanced" training bra. But she kept her silence as Jo eased herself off the bed and slowly reached for the catch on the skirt she was wearing. Shortly after that, she was letting it drop to pool around her feet, revealing that her panties were just as plain and white as her bra. When she looked toward Dawn, the older girl gave her a smile and nod of reassurance; thus encouraged, Jo reached for the edges of her bra and pulled it over her head – it didn't have any of the catches or fastenings that "regular" bras used. Next, Joanna slid her feet out of her sneakers before easing her thumbs under the waistband of her panties. Dawn could tell that her sister was thinking about calling the whole thing off before she finally found the courage to push her panties down, and step out of them. She quickly moved her hands in front of her pelvis, but Dawn was still able to see that the younger girl had just a small, very sparse patch of blond hair at the juncture of her thighs. As Dawns gaze moved upwards, she saw that Jo had a slight (but definitely female) curve to her hips and waist; higher up, her breasts were each roughly half the size of a tennis ball – though more cone-shaped. Each was capped with a quarter-sized puffy dark pink areola that sported a nipple that was roughly the size and shape of a pencil eraser.
To show her support, Dawn swung herself around and stood up so that she could take the couple of steps to where Joanna was trembling slightly. After giving the girl a gentle hug, Dawn reached down to take her hands – and after a little initial resistance, move them to Jo's sides. Letting the younger girl see her doing it, Dawn looked Joanna over before looking into her eyes and telling her "I think you're developing just fine. I know that you don't think you have enough tits or hair yet, but that's something that a little more time will fix – honest. You might not believe it, but I didn't look much different that you do, when I was your age; but I think it worked out okay, don't you?"