Alan finally finished painting Kim, and then turned towards Katherine.
She stood less than a foot behind him, totally naked now and touching herself all over. She was lost in the throes of erotic ecstasy as she dug deep into her pussy with two fingers.
Alan tried to get his sister's attention. "HellooOOOooo! Anyone there? Did you hear what I said about you having to stop? Could you take your hand out of your pussy for one minute?"
"I'm sorry," said Katherine as she slowly came back to the here-and-now. "It's just that I was thinking about the different ways and places you're going to fuck me. Maybe we can even do it this afternoon!"
"I've got to paint you, okay? Turn around and calm down. Put your hands up behind your head, and keep them away from your body!"
Alan began with her butt. Rivers of her juices rolled down her legs, distracting him. With her butt right in his face, he noticed all over again just what a beautiful, well-shaped bottom his sister had. He could smell her pussy too, and the combination of her beautiful ass, flowing pussy juices, and the aroma of sex which exuded from between her legs made his dick begin to twitch again.
He thought, Sis is so totally fuckable; why does she have to be my sister? ... On the other hand, if she wasn't my sister I probably wouldn't even know her. Heck, no way would girls like Aims or Sis even associate with me if it wasn't for the proximity and knowing each other for so long. I wish there was some way I could undo the sister label though, so she could be my girlfriend.
Seeing her hands still roaming over her breasts, he barked, "I said, put your hands behind your head already!"
Katherine finally obeyed his command. "I'm trying to calm down, but it's hard when I'm in a vulnerable position like this with my hands behind my head. I feel like I'm under arrest."
That gave her an idea, and she continued in a helpless voice, "Officer Alan, please don't hurt me! ... What's that? You have to do a full body cavity search because I was driving over the speed limit? With me naked like this by the side of a busy highway? ... Don't you trust your own sister? ... Well okay, if you have to, but why are you taking off your pants? ... You're going to probe my cavities with THAT?! It's so big! That's not like any kind of Breathalyzer test I've ever heard about, but if you say so!"
"Okay, okay, enough already," Alan grumbled, turned on by her scenario though he was. His penis had been getting a much needed break, until she started talking that way. "How can I work with you saying that kind of stuff?"
Katherine grumbled too. "Shucks. I was just getting to the good part in the story, officer. Please continue with your probing, anyway. After my blowjob proves to you that I'm not drunk, then you'll probably need to stick your thing back in my mouth as part of the cavity search. Well, one of them, anyway. Hee-hee!"
"And I'm supposed to keep calm when you two are like this?!" said Kim in exasperation.
"Are you? Calm? Dry?" Alan asked.
"For now, but barely." Kim replied.
He thought, It's strange, but I'm feeling more comfortable around Kim, even though I still don't know her from Adam. I guess playing with a girl's pussy is one way to bond. Besides, it does seem obvious that her only reaction to all this incest stuff is to get super horny. And Sis does say we can trust her...
After having Katherine calm down for a few minutes, Alan found that he was nearly done painting her butt. (His penis also sincerely appreciated the break.) He finally turned her around and started to work on her other side.
"Alan," Katherine said softly, "I'm pretty mellow now and I promise not to tease. Have you given any thought to my afternoon idea? Seriously?"
"If we were to do it, and that's a big if, where would we find a safe place? We can't begin to think about it until our you-know-who is gone."
She understood his veiled reference to Ron, and nodded. "What about this room? Hey! We could come here after school just a few hours from now!"
Alan considered that for a moment, but concluded, "This room isn't good enough. For one thing, with all the shelves and supplies there's barely room for three people to stand up. There's no room to lie down properly at all, on the cold, dirty floor. You don't want to do it standing up, do you?"
"I don't care! I'll do it with you standing, sitting, lying, swinging from the light fixtures, whatever. All of the above! I know... We could get out of this closet and do it on the floor of the next room! In fact, why even wait until after school? We still have at least twenty minutes, and I'm sure Kim would like to watch."
Alan momentarily addressed Kim. "Don't mind my sister. She's gone totally insane. Yeah, getting caught doing my sister on the cold concrete floor during lunch sounds really enticing. I can just imagine being led away in handcuffs through crowds of our friends."
He turned to Katherine and said sarcastically, "Why don't we just do it out in the hallway to make sure we'll get caught?"
"Okay, so maybe that's not the best idea," she conceded. "I guess we're screwed for now. Or not screwed yet, as the case may be," she giggled. "Our first time should be special and not done furtively in the back seat of a car or something like that. But I'll think of something."
Kim volunteered, "I know the perfect place."
"You do?" both Katherine and Alan said to her at the same time. Alan swiveled his head around to face her.
"Yes. Perfect privacy and security. My house!"
"Your house?" He was so shocked that it was all he could say. He was pleased, but also scared that the incestuous idea had so suddenly become increasingly real and possible. He also still worried if he could trust her. The blackmail possibilities in doing it there... We could be so screwed! But then she already knows everything anyway. How much worse could it be?
Kim explained, "Yeah, you two are, like... I dunno, inspiring or something... Both of you are like sexual desire in its purest form. Nothing can stop you! It's so sexy... I wanna help. Katherine, I wish I could find someone I was half that excited about, guy OR girl. Anyway, I live with just my mom, and she's ALWAYS at work at least until six, usually seven. I mean she's never come home before that, and even if she did, I'm on the upper floor and we would hear her car coming up the driveway."
Alan resumed painting again. He was absolutely determined to finish, no matter what.
Katherine, on the other hand, bounced up and down in excitement, which forced him to pause.
Kim smiled kindly. "Given that I'm supposed to treat you like a sex slave, Katherine, I'm being way too nice. Maybe I'm just not cut out to be the cruel master type. Anyway, I do have one condition. Your first time should be special with just the two of you alone. But after that, you can keep using my house, but only if I can join in."
"Join in?" Katherine asked in surprise. "Even with Alan?"
"Hrm. I don't know about me being with him, but I figure that if I'll ever have the perfect opportunity to give an exciting man a try, this is my chance. I have to admit his finger felt pretty good in me just now, even if he was just doing it as part of the painting job. I guess a finger is a finger, and I've always liked strap-on dildos, too. So trying a dick might be... interesting. If I'm not into it, I still have you, Katherine, and Alan and I can keep you busy at both ends."
Alan had stopped painting again, while his mind just boggled. "How can anybody turn down that offer?" he thought out loud.
"I accept!" Katherine said. "Big Brother? This afternoon?"
"Hmmm..." he pondered, and then replied to his sister, "No, we have to wait. I'm seriously worried that you're turning into an uncontrollable sex maniac. If you can hold yourself off until Wednesday, then maybe that shows we have enough self-control to do this and possibly not get caught. Then we can make the arrangements for Thursday." In addition to that, he had an unspoken worry about Kim. He figured if a few days passed and she still hadn't told anyone anything, that would go a long way to proving that she could be trusted.
He added, "But between now and then, you have to act totally one-hundred percent like your old self. No touching, nothing. I've gotta maintain control too. If we can't do that, then we need to cool off some more."
"Deal!" she said excitedly. "That's why I love you so much, Brother: you're so smart and wise and prudent. I wish I could reach down and hug you!"
He warned her, "If you did that, then Thursday would be off. We have to maintain total control. Don't even call me 'Very Big Brother.' You never added the 'very' until a couple of days ago."
"That's because, all these years, I never really knew just how big it was until I put it in my mouth."
Alan's penis twitched with new life at that thought. As an afterthought to their plans, he asked Kim, "Does Thursday work for you? And can you maintain complete secrecy?"
Kim answered, "I'm also with Katherine in that I hope you two can hurry it up a bit so I can get in on the action! But I can wait. And I swear no one will know except us three. Not even my mom will ever have a clue, if we plan this carefully. The only other person who might suspect you two is Heather, because she knows more about the painting project than the other cheerleaders. But I can help steer her away by using some subtlety."
Alan was happy to hear all that. It seemed that Kim had some prudence. "Good. Heather is a bit scary, don't you think? She intimidates me, anyway. All right, let's finish this paint job and get out of here. I don't even want to know what time it is right now, and I'm still not done. Sis, you may have to be late to your fifth-period class, if this is gonna dry. You two behave yourselves and put your tops back on. When I'm done painting, I'll go see if I can finagle a hall pass for you. And Sis, remember that you're not allowed to get yourself off with Kim either, or anyone else, until Thursday. You wouldn't prove your control if you did that."
"Damn!" both girls said in unison.
Katherine got Alan to agree that the ban on her behavior would end at exactly midnight Wednesday. She planned on being with him as soon as the minute hand ticked over to Thursday.
Alan was able to get the hall pass for his sister. That was one of the perks of his having such a goody-goody reputation.
When he returned to the supply closet just before the end of lunch, he also had a can of air freshener. Both girls stood naked from the waist down and had a normal conversation with each other when he stepped back into the closet. He'd used a special knock first, so they weren't worried.
"What's with the air freshener, and where did you get it?" asked Kim while she helped clean up.
"When I walked out of here and into the main supply closet, I realized this room smelled totally like sex. It still does, obviously. There's absolutely no air circulation in here. Even if someone were to come in here hours from now, they're still going to suspect, no, they'll know, that people have been fooling around in here. Look at you, Kim. You STILL have my dry cum on your leg! Good thing I thought of every eventuality - I brought some moist towelettes, too."
"Katherine, your brother IS pretty resourceful," said an impressed Kim. "There's definitely something to this guy. No wonder you, maybe Amy, and this other mystery girl are all over him. If I were to have a secret affair with a guy, I'd want it to be with him."
Katherine pretended to be passing her hands over a crystal ball while telling a fortune. "You WILL have such an affair very soon, and it WILL be with him." She giggled. Like bees to honey, she started to rub his boner through his shorts.
He gave her a discouraging look, since she was supposed to behave for the rest of the day. He had to push her hand away so he could get something done in the little time left for lunch.
"Good point," said Kim, surprised, as she hadn't thought of herself and Alan as having an "affair."
They practically sprayed half the bottle of air freshener into the room before they left, just to be on the safe side. It smelled like one giant flower by the time they were done, which in itself would be very suspicious for a supply closet, but it couldn't be helped.
Alan decided that the next time the need arose, he would get something that smelled like a powerful cleaning agent to mask any smell.
Katherine was late to class, but it didn't matter much.
Kim spoke to Heather before practice. The two of them had previously thought up some devious plans for what they would do with Katherine during practice that day, but Kim begged that they delay until Thursday, even though she wouldn't tell Heather why.
Heather gave in to Kim's pleading and agreed, though reluctantly, telling Kim "You owe me one." She had really been looking forward to Katherine's punishment.
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