"Ugh, you're all sweaty."
They were headed back to Kim's house. Ron, who at this moment was in Kim's body, huffed.
"Um, earth to Kim, we were just running around one of Draken's secret layers. Of course I'm all sweaty! You're not exactly clean yourself, you know. Although, your deodorant is working perfectly. What do you use? You smell like a flower patch!"
Kim rolled her eyes. "I'll show you when we get back. My point is... I.. I mean you... need a change of clothes."
"So? There's at least three sets of my usual in your closet."
"Ron!" she exclaimed, blushing, "I need to take these clothes off, and put on fresh ones!"
It was then that Ron realized he was royally screwed.
Because Ron, too, needed to change clothes. And use the little girl's room. In Kim's body, he blushed madly.
"I mean, uh, it's not a big deal. We used to take baths together. And I mean, I lose my pants so often, you won't have any surprises."
Kim couldn't look at him, but she registered from the sound of his voice that he felt her embarrassment.
"We've grown a bit since we were four, Ron."
"Kim, really... It's no big. We're best friends, right? We've changed in front of each other. It's no big. We trust each other."
"Right," Kim sighed. "No big..."
They soon reached Kim's house, both of them running, blushing, up the stairs before anyone could interact with them.
"Ok, here's what you need to know," Kim began. "First, bras."
She pulled one out of her dresser, a simple white one, and started wrapping it around her body, inhabited by Ron, backwards(over the clothes).
"Um, KP? Doesn't this go the other way?"
"Yeah, but you have to put it on backwards first. Look."
She showed him how to hook the bra properly, which hooks to use, and waited calmly for him to figure out how to unhook it himself before moving on. She didn't miss the strange look that covered her own face, a look of mortal embarrassment mixed with... curiosity.
"Ok... This shouldn't happen before we're able to switch back, but..."
She then grabbed the ugliest pair of panties she could find and took him to the bathroom to look inside a cabinet under the sink. In it were several feminine products- Ron was not unfamiliar with them, at least, but he had no idea how to use them.
"If my body starts, um, menstruating, you'll want to take some painkillers right away, and you'll need these."
She pulled out a box of pads and carefully showed him how to apply them to the underwear, trying not to look at him as she went, knowing that if her time of month came, Ron would have to use...
"When it's time to change it, you just rip it off, wrap it in toilet paper, and throw it in the trash," she finished.
Ron looked mortified. "Don't other people in the bathroom... hear that?"
Kim swallowed. "Uh, most girls aren't paying much attention to it, since it's pretty... common... But that's part of the reason I prefer these..."
She then pulled out a box of tampons, and took one out of the wrapper.
"It um... takes a few tries to get right. If you don't do it correctly you'll feel it all day, but otherwise you won't feel it at all- they HAVE to be changed about every four hours, though."
"Why? What happens if you forget?"
Kim saw an opportunity for humor here. She summoned the gravest expression she could muster, raised her head slowly to look at Ron, and said very seriously,
"You die."
Ron's eyes bulged. "What?"
Kim laughed then. "I'm kidding, Ron. Well, half kidding. Most of the time nothing happens, but you can get TSS if you leave them in too long, and if that goes untreated you really can die from it. It's not common, though. Anyway..."
She blushed. "With these you have to kind of... spread your legs a bit... to get it at the right angle. You insert it up to here, and then push down here," she said, pushing the applicator so that the tampon slid out of its casing. "Once it's out all the way you just pull out the plastic piece, wrap it up, and throw it away."
She held the tampon by the string. Ron looked somewhat mesmerized as it swung back and forth between her fingers.
"It's like a plug!"
Kim grimaced. "It's really not, and don't you forget it, or you'll be borrowing someone's jacket on a bad day. If it gets too full, it's like a sponge or washcloth, it will leak."
Ron gulped. "How do you know when it's... full?"
"The string. It will start to come down the string. Once that happens, you pull it out."
"By the string?"
"Yeah," she said, eyeing him. He now seemed eager to learn all he could. She threw the unused tampon in the trash- "it's got bacteria on it now," she explained- before showing him around her hair care products, makeup, and whatever else she thought he might need in order to look her best.
"Ok- Now, you."
"Me?"
"Yes, you! I don't want any surprises- I can do anything, but I want to be prepared for anything, too!"
Kim's face looked thoughtful for a moment, and then flushed again with mortified embarrassment.
"What?"
"Um... Well, there's aiming..."
"I can just sit," Kim said, waving him off.
"Wellll..."
Ron's face frowned. "What?"
"It depends... on the toilet... I mean if it touches the water, it's..."
He couldn't look at her, but she was watching him with a strange, shocked look.
"Ok... I think I can figure it out, I did help potty-train the Tweebs. But... anything else?"
Ron took a deep breath, causing Kim's chest to make a slow, up and down motion. "Pee before going to bed."
Kim raised an eyebrow. "Why? Do you wet the bed otherwise?"
She was somewhat surprised to see her own face glaring at her.
"No!" he said, perturbed.
"Then... why?"
"It'll make it less of an... annoyance."
"Make what less of an annoyance?"
Ron looked away from Kim. "Morning wood," he muttered.
Kim was still confused. What on earth?
"Ron, what are you talking about?"
"My... Ah, that," he said, pointing at his own crotch, "gets... hard... sometimes..."
His own face looking back at him now held a look of disgust.
"It's common," he assured her. "And it's not a sex thing."
"It's not?"
"No! I mean, it could be, sometimes," he said, looking away as a blush swept across his face, "but guys get boners for no reason, like, all the time. And peeing with a boner, well, it sucks."
Kim Possible, for the first time in a few years, was suddenly very aware that Ron Stoppable was, in fact, a guy. She shook herself a bit, and then asked him if there was anything else she needed to know.
"Not that I can think of," he sighed. "Let's just... get ready for dinner."
His head nodded slightly, and they left the bathroom, changing as quickly as they could- they decided to change in the same room, there being little point in not doing so- faces red the entire time- and then headed down the stairs to explain the situation.
Kim was a serial stomach sleeper. That was a fact even Ron knew, which was why, as she woke up in Ron's bed that morning, she cursed him under her breath for not warning her about this.
Morning wood, sure, maybe it wasn't sexual all of the time, but her- no, his- body was moving on its own, begging for stimulation, against Ron's bedsheets.
Kim had only ever felt this amount of need when she had experimented with herself, maybe once after an interesting dream, but usually not quite so accidentally. As weird as it was, as disturbed as she was, she needed release. And fast. In her mind she pretended she was still asleep, at least enough that whatever happened was certainly not her fault, and kept moving, suppressing the soft moans she desperately wanted to let out.
She found her hands moving on their own, almost in a muscle memory type fashion, as she reached into Ron's boxers. A shudder of pleasure ran through her as she grabbed and squeezed and stroked his hard cock, trying not to think about what it would feel like inside her own body, but eventually giving in to fantasy and sensation.
The entire thing was strange, an odd experience, but she kept going, a strange curiosity within her, until she felt her breath leave her as the body that wasn't hers seized, wetness on her hand and in the boxers she was wearing, clarity coming back to her mind as Ron's dick pulsed less and less frequently and became soft.
"Oh shit," she cursed, suddenly more than aware of what had just transpired, a strange terror lumping in her throat. She threw her head into Ron's pillow. "Oh my god, what would Ron think? Oh my god..."
Even worse was that she had actually liked it.
Kim composed herself, taking a few deep breaths, and began to clean up the mess she had made. She showered- careful not to attend to that appendage anymore than was necessary- and changed, deciding she wouldn't speak of it. Ever. Ron didn't need to know.
Ron, on the other hand, had woken up similarly.
The night before, he had been looking for a decent pair of underwear for Kim when he spotted an odd instrument in her drawer. For a moment he inspected it, pressing a button at the top, before quickly dropping it in mortal terror.
He hadn't watched much porn, but he had watched enough to know what he had just stumbled across.
"This is so wrong," he whispered, gently picking the vibrator up off the floor and struggling to turn it off as he flipped through a few settings.
But that night, in his dreams, she was there. With the vibrator. In his dreams she was naked, grabbing helplessly at her breasts, using the toy on herself, desperate for release.
He woke up wet, and wanting, and he felt embarrassed, and after trying for several minutes to think of anything else, he pulled the vibrator back out of the drawer.
"I can't go to school like this," he reasoned. "I'm..."
He didn't finish the sentence. Kim's body was dripping wet, and he felt that at the slightest touch he would be begging for mercy. Tentatively, closing his eyes, he removed Kim's pajamas and underwear and gently rubbed, with two fingers, the area that was quickly becoming warmer and wetter than he could handle.
His eyes shot open at the contact, a mistake, as he caught a glimpse of her in the mirror, naked, touching herself, with a look of desire on her face- as he desperately wanted her. Oh, there was no way he could go to school like this... He brought his hand back up to his face, Kim's fingers into his mouth, and let out a soft moan at the way she smelled, the way she tasted.
Taking a deep breath he laid back on the bed, switching the vibrator on low, and, after a moment of uncertainty, closed his eyes and grabbed Kim's breasts, exhaling lightly as he slowly rubbed Kim's body with the tool.
"This is so wrong," he muttered, but he couldn't help but continue, and it wasn't long before he felt himself convulsing, biting his hand to keep from crying out, as he felt her body cum.
Embarrassed, he rushed to the bathroom, cleaning the vibrator, placing it gently back where he had found it, and exactly how he had found it, and quickly showered and changed. He certainly couldn't tell her about this. Not ever. And especially not that... Well... That he had liked it.
"Do you remember that time we switched bodies?"
Ron laughed. "Of course I remember! There was no way I could have mastered that cheer routine- although these days I think I could give it another go!"
Kim laughed, too. "It was sweet of you to try, though!"
She started unpacking another box, blushing at what she hadn't said.
Ron was also blushing, silent, as he looked around her college dorm uncomfortably.
"Um, Kim, there's something I should tell you..."
She looked at him curiously. "What?"
"That time we switched bodies, I, um... I found your..."
She blushed madly. "Oh my god... I used to leave it in my drawer... I'm so sorry..."
"No, no- Kim- it's me that should be sorry- I couldn't stop thinking about it and when I woke up that morning I was so..."
He couldn't look at her, and so didn't see the oddly hopeful look she held on her face.
He gulped. "It was just the one time, I swear- I cleaned it afterward- I managed to put it out of my mind the rest of the time-"
"Ron-"
"I understand if you hate me for that, it really sucked-"
"Ron-"
"Your body was just, dripping, and I was afraid someone would-"
"Ron!"
"Oh who am I kidding, really, I was making excuses so that I could- but you really were dripping and-"
"RON!" she exclaimed, bright red herself. He finally stopped and looked at her, surprised to see a small smile on her face.
"Y-yes?"
"Ron, you forgot to warn me about something, back then."
He frowned. "Oh no, what?"
She giggled.
"Ron... I sleep on my stomach."
His eyebrows furrowed together, not quite understanding. "So...?"
"So, Ron, how do you think I woke up that morning?"
Realization dawned upon his face, curiosity plaguing him, and he was suddenly shy but forced himself to ask.
"Did you... take care of it...?"
She blushed harder, if possible, and looked away, but managed to squeak out a tiny, embarrassed, "Yes."
Some mixture of shock and amazement filled his face. They hadn't gone very far together- yet. Even after years of being friends, even after over a year of dating, they hadn't really...
Some amount of confidence took him over, or boldness, or something, and he knelt down to where she was sitting, cupping her cheek.
"Show me how," he said.
"What?" she squeaked.
"You show me, and I'll show you."
She stared at him, wide eyed, but suddenly stood and went to one of her boxes, opening it to reveal the exact vibrator he remembered using on her body so many years ago.