Shego crept up to Kim's window to find a note stuck to the glass...
Not tonight! Ron in the next room!
...The green girl's smirk had an especially mischievous component as she went in anyway.
Apparently Kim had assumed Shego would pay heed to her warning, for she was fast asleep. The villainess took off her gloves and folded the duvet over to gain access to the sleeping girl, then slipped a hand into her sweatpants and started molesting what she found there.
After a couple of minutes it seemed as if her plan might backfire; Kim's breathing had deepened and she was starting to moan, but she wasn't waking up. Figuring it would be best to muffle the noise she was making before she got any louder, Shego added kissing to her efforts.
That did wake Kim, who responded enthusiastically until she remembered why she wasn't supposed to. She tried to push Shego off, but only managed a few inches; not quite far enough to prevent her lover from flicking at the redhead's lips with her tongue. Kim was tempted to bite it, but didn't want to do anything that would risk waking Ron.
Realizing the lengths to which Kim would go in order to make as little noise as possible, Shego started struggling to pin the teen hero down. Kim could see in her face that she had realised her advantage and surrendered before she was beaten outright. Shego claimed another kiss as reward, before whispering in her ear, "What's the matter, pumpkin? Wouldn't fucking your archfoe while your sidekick's in the next room turn you on?"
It would, but in Kim's estimation it wasn't worth the risk. "The slightest thing could wake him up. We could have woken him up already. The sound of your voice might wake him up! And if you light up..."
"Scare him that much, do I?" Shego nibbled the earlobe as appreciation for the compliment.
"It's like a survival instinct," Kim tried to explain, "The sound of anything he considers dangerous will wake him, and the last thing I need is for him to walk in on us."
"I seem to recall you being on the verge of telling your mom about us, at some point."
"Mom wouldn't freak like Ron would. Even if she did freak, it wouldn't be as bad. And... she'd still be my mother..."
"But you might lose your best friend?" Shego didn't give a damn beyond what that loss would do to Kim.
"I can imagine he'd get used to me being into girls - eventually - but being into you? He'd probably tell Global Justice you've drawn me to the dark side, or something."
"I have no intention of leaving until I get you off. Is that dark?"
"Only if you rape me."
"Technically, I'm raping you every time."
"I know... it seems kinda silly."
"True." Shego considered a moment, then said, "And really, is it even possible for me to rape you?"
"What do you mean?"
"Well, you're the horny slut in this relationship..."
Kim grabbed Shego by the hair and tugged sharply as punishment, but that only brought the villainess from her ear to her lips, which she kissed roughly. She had a point to make, and sure enough, the teenager eventually succumbed. Once she started kissing back, however, Shego stopped and went back to her ear. "Told ya."
The redhead was actually disappointed in herself. "Am I really a slut?" she asked uncertainly.
"Not a slut. My slut." Another nibble at the ear. "Unless you go fuck the whole football team, or something. Although... watching them jerk off all over your goody two-shoes face might be worth it." Shego sniggered, and was poked hard in the ribs for it.
"I won't even be your slut if you keep it up."
"As if you could resist me, even with your sidekick in the next room," Shego insisted, but she didn't want to push it. If she all-out challenged Kim, the teenager would refuse her advances. No need to do that while she has an actual reason to, the green girl decided, it'd be too easy for her. Instead, she chose to add, "Besides, I brought a new toy with me tonight, and I intend to use it."
"What is it?" Kim asked, curiosity getting the better of her.
Shego reached down to her calf pouch, popped the snap and handed the small pink item to the redhead. Clearly she was confused by the shape of the thing, so the green girl mouthed the word, "Buttplug."
She was glad she hadn't leaned down to whisper it in Kim's ear. The teenager's expression was priceless.
Kim opened her mouth, paused, and pulled Shego's ear back to her lips. "It's smaller than I expected."
"They're colour-coded according to size," Shego explained, her amusement clear in her voice. "Did you think I was going to stick something the size of the strap-on up your virgin ass?"
"Well... yeah..."
"Heh. Don't worry, princess. If you want to work your way up to actually getting your ass fucked, that's fine and dandy." The villainess took the toy back from the heroine. "This is just to show you how much fun it can be."
From then on, things progressed as they usually did. Shego started kissing Kim and didn't stop for a good long while as her hands explored the nubile young body beneath her, removing clothing as it got in the way. Faint dark lipstick marks trailed down the teen's body all the way to her crotch, and she was surprised to feel the toy inserted in front instead of behind. Feeling it twist back and forth, she realised Shego was making it wet before putting it where it was designed to go.
"Relax," the green girl whispered, and Kim did her best to comply as Shego started going down on her in earnest, beginning the process of bringing her up and letting her down... and inserting the buttplug on the first down. She gasped at the sensation, but once the shock of unfamiliarity faded, she realised it wasn't as uncomfortable as she had always assumed. Her lover went back to work between her legs, ignoring the toy completely, and the redhead gave herself over to the lovemaking that was being bestowed on her... after a nervous glance in the direction of the door.
When the orgasm claimed her, she was unprepared for the sensations added to the experience by the object in her anus. Clamping down on Shego's fingers as they worked inside her was one thing, but she'd never realised she did the same with... it took all her willpower to keep herself from voicing her ecstasy, managing to only gulp down deep breaths and hiss through clenched teeth as each wave crashed through her.
She was unaware that the villainess had crawled back up to her face until the kiss, full of the flavour of her own sex. Kim sucked on Shego's tongue greedily, knowing how much the green girl enjoyed feeding her her own essence.
Eventually the black lips went back to her ear and whispered, "I'm guessing, from the way you tried to pop my head like a melon between your thighs, that you enjoyed that."
"Did I?" Kim wondered how she could have been so oblivious to her own actions. "Sorry..."
"That wasn't a complaint. I'm just wondering how you'd react with the strap-on and buttplug at the same time."
The redhead tried not to laugh outright. "I wouldn't dare do that here. Even if we had the house to ourselves, I'd probably wake the neighbours."
"Neighbourhood, I'm thinking." Shego slid down just far enough to nibble the teenager's neck a moment. "So, I want to hear you say it: did you enjoy that?"
"Yes, Shego, I enjoyed having something in my ass while you fucked me senseless."
"Mm, glad to hear it. My dirty little slut." A stronger nibble followed the statement.
"I think I should pay you," Kim muttered in a cute version of her grumpy voice.
"What do you mean?"
"Well, if I'm your slut, I think you should be my whore."
"You can't afford me for that, either," Shego pointed out. "Maybe I should pay you. Then you can be a slut and a whore. Then I can call you a slut and a whore whenever I want, and you can't argue."
"Want to be my pimp, too?"
"If I can find the right hat."
"I'd look better in purple and you know it."
Shego's response to that was to pull the buttplug from Kim's ass, which made her squeak, alarmingly loudly. Shego slapped her other hand over her mouth before the redhead could do it herself, sniggering silently at Kim's reaction. She then leaned across to stand the toy on its base, on the bedside table. "You should wash that between uses. And never put it in front after it's been behind."
"You're not taking it?" Kim asked, surprised considering the green girl's possessiveness of the strap-on.
"Nope, this one's all yours."
The teenager bit her lip, then asked, "Shego... would you like it if I... use the strap-on to..."
"Do you want to, princess?" the villainess replied with a teasing smirk. "We'll see."
As her lover went back to nibbling her neck, Kim wondered what it would be like to get more practice using the strap-on on Shego... wherever she wanted it. She also wondered about the lingering ache between her asscheeks. Was she just sore, or had she actually hurt herself?
"Should I go wash it now?" she suddenly asked, hitting on an excuse to check on her posterior.
"If you want..." Shego admitted, wondering what the redhead's game was.
Further inspired, Kim added, "Then I can use it on you, can't I?"
"Well, I'm not about to turn the offer down. Especially if you've decided to fuck me despite the buffoon in the next room."
"Get undressed and keep the bed warm for me, then." The teenager slipped out of bed, carefully picked up the buttplug - she didn't want to touch the business end of the thing just now - and padded down the stairs to visit the bathroom below...
Only to turn at the foot of the stairs and face her mother.
While she was stark naked, with black lipstick smudged across her body.
And smelling of sex. Oh god, she could still feel the sticky dampness of her own juices on her lips!
Ann was the first to attempt speech. "I was just... I thought I heard..." Her gaze travelled down and up her daughter's body; Kim hoped she'd hidden the hand holding the sex toy behind her butt casually enough, but her mother had already spotted it. She also inhaled deeply enough to prove she could smell what Kim had been doing. "Well," Ann continued in a surprisingly amused tone, "I guess that explains why you're undressed, but... you squeak?"
"W-what?" Kim squeaked.
"It's what woke me up. A loud... squeak."
"Oh. Oh! Me too! It must have been Rufus."
Ann blinked, then raised an eyebrow. "Ron's upstairs?"
"It's not like that!" Kim hurredly amended. "Ron's sleeping on the couch in the den, he's not... we weren't..."
Ann's other eyebrow joined the first. "You haven't been abusing the poor mole rat, have you?"
Kim gaped, then shook her head wordlessly. Hearing such a notion from her mother's own lips was so wrong-sick that even a Ronism was insufficient to describe it.
The elder redhead's face grew serious as she stepped closer and whispered, "Kimmie... I know who you've been... spending time with, in your room. Doesn't she keep trying to kill you?"
The teen hero had actually considered how she'd respond to that question from her mother before. "Not really. She knows how well I can defend myself. She loves fighting me. It's kinda the best part of the job, for both of us," she finished shyly.
"And you're positive she's not working now?" her mother pressed.
"I am. She's not that evil-"
"I don't think she's evil," Ann surprised her daughter by saying. "I think she's a lonely, unhappy girl. What troubles me is that she's chosen you to make her happy. You do realize it can't last, don't you?"
"It'll last as long as it can," Kim told her firmly, despite her current circumstances.
Her mother seemed to accept that, at least for now. "We'll talk about this some more, later," she affirmed before walking off in the direction of the kitchen, in need of a strong drink.
Kim dashed into the bathroom and shut the door the second she was through it. As the shock of the surprise encounter wore off, she lay down, curled into a ball, and tried not to die of utter humiliation.
It wasn't easy. Shego must have heard the exchange. She was probably laughing hysterically into a pillow right now. She'd be impossible when Kim went back to bed. The only thing that motivated the teenager to return upstairs was that she couldn't bear to still be in the bathroom when her mother returned.
But when Kim did step back into her bedroom, Shego was gone.