Alan rested for a while. Then he looked over at Katherine and was struck by how naked she appeared. The straps which had previously covered her boobs were now under her arms and, from the front, made it appear as if she was naked from the waist up.
That got him nervous, so as his orgasm subsided he looked around the theater to see if anyone was watching them. He had gotten so absorbed that he had nearly forgotten where he was. The coast seemed clear. He wiped his sweaty brow and heaved a sigh of relief.
They put their hands back on their own laps for a while.
"That was soooo good..." she cooed. "And looky, the popcorn has extra-special flavoring now." She reached into his popcorn bucket and found some of the popcorn splattered with his cum. "Try some," she said.
"What are you doing? NO way! That's gross!" he whispered almost too loudly.
"I'm doing this for a reason. We need to get rid of a lot of the popcorn and I don't want to be rude and just toss it on the floor. Actually, your surprisingly sweet cum doesn't go that well with the butter flavor; salty cum would make a better condiment. Did you see how I was eating your popcorn before? I have to get it to the level of the top of your cock, so I can stick my head in there." She continued to eat the cum-flavored popcorn.
She suddenly turned and looked at him with an extremely naughty expression. "And do you know WHY I'm going to stick my head in there? Can you guess what my lips are going to be wrapped around?"
Alan could guess very well, but he didn't want to encourage her teasing lest he blow his next load before she could even touch him. Instead he asked her nervously, "Can't you cover up your boobs? Do they really need to be exposed like that?"
"They're that way so you can play with them. I'll make you a deal. After you're done playing with them, I'll close up."
Alan was weary, but no fool. Her magnificently shaped breasts looked so tempting that only a complete idiot would turn down that offer. He reached over and resumed groping her tits.
He lost track of time doing that. He was such a "tit man" that he would have been perfectly happy to play with them for hours on end.
Meanwhile, Katherine continued to eat his popcorn. After about ten minutes, she said, "I can't wait any longer," and began to shovel the remaining popcorn out onto the floor with her hands.
Then she put her head in the bucket. Her mouth quickly found the tip of his dick, but she couldn't really get any further down, because of the sides of the container. She partially ripped the side nearest her, pushed the cardboard down, and dove back in. Soon her head sank deeper and forced the remaining popcorn out of the way.
Alan held her box of popcorn up in the air with one hand and tried to use it as a shield, positioning it between her head and the aisle as best he could. "What if someone looks now?" he groaned between labored breaths.
Katherine was too busy sucking to answer. She kept at it until her jaw grew too sore to go on.
When she finally pulled her face out of the box, he thought she looked quite amusing. Her face was completely covered with buttery oil. There even was a kernel of popcorn lodged in one of her nostrils. He pulled it out for her.
"Next time, we're getting unbuttered," he quipped.
They both giggled quietly.
"I think I like it better buttered though," she replied in all seriousness. "It makes everything slippery, just like the soap yesterday. Next time, we get extra butter!"
She put her hand on his upper arm and wiped. Sure enough, it was soaked with oil and left a big trail on his skin. Then she took that oily hand and brought it down to his erection.
As she started to slip and slide her hand up, down, and all around, she asked, "So. Having a good time? Who's the better date, me or Christine?"
Alan groaned, and for once it wasn't only because of intense pleasure. "Sis, uh, I mean Katherine, what is it with you and Christine? How many times do I have to tell you that I'm not interested in her anymore?"
"Oh, about a thousand. For starters." Her hand pumped and pumped and pumped. "Ten thousand."
"Why?! For one thing, why does she bother you so much, but S and S don't? I don't get that."
She just rolled her eyes and sighed. "Men. Duh! They're cute but so dumb. I'll bet if you were feeling an intense emotion down to your guts you'd mistake it for hunger." She leaned over and went back to sucking on his knob.
"Huh? What was that all about?"
But she didn't answer - she was too busy loving his thick pole.
He was still confused, but the way she was swirling her tongue around and under his cockhead felt so good that he eventually forgot all about the issue.
He spent many minutes fondling her pussy, ass, and everywhere else he could reach. Since she was almost completely naked, he wanted to feel up as much of her body as he could.
Katherine, by contrast, was mostly interested in his dick, and spent as much time with it in her mouth as she possibly could.
They continued like that on and off for most of the rest of the movie. They were limited only by the ability of his rod to revive and by the endurance of her tongue, jaw, and fingers.
At one point, Katherine even made the suggestion that Alan should fuck her. She lifted up her leg and exposed her pussy yet again to his eyes. As he held his erection, she said, "Why don't you put that someplace useful?"
"Katherine!" he whispered anxiously. "Are you suggesting what I think you are?"
"I'm just saying, why not just rub the outside lips? Kind of a dry fuck? It would feel so good!" She figured once she had him doing that, the rest would follow naturally.
But he had the same thought. "No way, man! If we do that, who knows where it will lead. You don't really want me to fuck you, do you? Much less, in a public movie theater! That's so totally wrong. Tell me you don't have that idea."
In the face of his resistance she said, "Of course not. I just like playing. Speaking of which, don't you want to touch it? In the meantime, let me take care of this."
Her hand returned to his shaft, his hand went to her pussy, and they went back to playing some more.
But Katherine considered it merely a temporary, tactical retreat. She suspected that if blowjobs made her feel that good, true intercourse would probably make her feel even better. She couldn't wait to find out if she was right.
He started paying some attention to the movie, only because he was worried about the time. He didn't want to be sitting there with both hands running over his nearly totally naked sister, with her hand bobbing in his lap, when the movie ended and people passed them on the way out.
At one point, he noticed on screen that Hugh Grant was up on a stage, dramatically playing guitar in front of a large crowd of people. He got the vibe that it was a Hollywood kind of movie climax, so he determined to have another climax of his own while he still could. He'd been desperately fighting the urge to cum for some time now, so it was easy for him to simply give in and let go.
Katherine happened to be stroking him as she rested her jaw yet again.
He whispered, "Sis, you're making me so hot I can't stand it anymore. I'm gonna blow. Again! I want your hot lips around me. I wanna fill your mouth with my seed. Again! Dang, three times in an hour or so. Even I can't believe I can manage it. And it's only because you're so amazingly inspiring."
She dropped her mouth to his rod yet again. She'd lost count of the dozens of times she'd done that since the movie had started. "Am I? Even more than Christine?"
"Sis, if Christine is as hot as a fire in our fireplace, you're a fucking sunspot! There's no comparison. The Ice Queen isn't even worthy of holding a bag of your toenail clippings." He didn't exactly know what he meant by that weird comment, but it appeared to have worked since his sister's eyes lit up.
"Really?"
"Really. All she's got are the big tits, okay, and the big intellect too, but she's got a cold heart. You, you're like a fireball of pure lust. You're so sexy that you're gonna give me a heart attack!"
"Oh Alan! I love you so much!" She attacked his erection like a woman possessed. She tried to jack it off with both hands while swirling her tongue everywhere on it and sucking it down to the root at the same time.
Not everything worked, but enough did to cause him to lose control in less than a minute.
Even though he'd again coated the back of her throat with his cum, she still hadn't gotten enough.
Most remarkably, after all that, they still weren't exhausted. He happened to be riding a wave of energy, so he found himself vigorously fondling her sweet body only a few minutes after shooting his previous load. His penis was still down for the count, but that didn't slow his ardor at all.
The movie finally ended about five minutes later. He had played with her ample tits off and on for most of the movie, but she didn't fully cover them up until the credits started to roll.
With the movie coming to an end, and with Alan using one hand to squeeze her right tit and the other hand to pull at its nipple, Katherine decided to say a few last things while she still could. She whispered to him, "You really know how to get me off, do you know that? Mmmm. I think I'm going to have to be a slut for you from now on. A cocksucking sister-slut. Would you like that?"
"Shhhh!" he whispered back. "Don't say that!" He saw the credits starting and began to freak out. Luckily there was no one sitting near them, because they were completely unprepared for someone to pass them by.
Katherine, though, was so turned on that she didn't want to stop for anything. She whispered, "Say what? That you have a sister who wants to suck your cock? Are you saying I should just stand up and shout that to the whole movie theater? Maybe I should just take off the rest of my fucking clothes, and stand up buck naked and fucking scream out 'I love my brother's juicy cock! We're going to go home right now and then he's going to shove it up my cunt!' Do you think that might get people's attention?"
He groaned in tortured ecstasy, especially since her words caused his dick to instantly engorge yet again. He could scarcely believe that such a thing was possible.
She immediately took advantage of that. His dick was so slippery with popcorn oil and cum that it was slicker than a greased pig. Her hands resumed flying up and down his prick, completely heedless of any danger.
"Shhhh!" He realized that he'd been moaning far too loudly, and that she was making too much noise as well. He looked around the theater closely, but no one seemed the wiser.
As more people stood up, he grew desperate. "Stop it, please! I beg you! If you love me, pleeeasse! Stop!"
At that, she immediately stopped and began covering herself up.
He'd stumbled across the magic words unwittingly, because she was secretly resolved to do anything she could to show the depth of her love for him. His only clue to this was that she whispered, "Okay, if you put it that way..."
Eventually, they both finished dressing.
They thought that they were in the clear now and that no one had noticed their amorous activities, but as the theater cleared out an older woman who had been sitting two rows in front of them muttered "Disgusting!" as she walked past them.
The two of them had periodically tried to clean themselves and their chairs, but they hadn't brought enough napkins, so Katherine's face was still covered with the residue of buttery oil.
Alan did his best to lick it all off as the last of the other moviegoers left, but he refused to give her a kiss on the lips, to her immense frustration. "Boundaries," he said. His stance on boundaries shifted from minute to minute depending on which head was in control - the one on his shoulders or the one between his legs.
Finally, they stood up to go. The credits were all done and the lights had turned back on.
Katherine looked back fondly at her seat and commented, "Think about the poor schmuck who has to clean this place tomorrow. I wonder if he'll look at the popcorn boxes" - both of them were on the floor in a ripped, punctured, and mangled state - "then see all the white stuff on the popcorn on the floor, and put two and two together!"
"I'd like to think that we came buckets," Alan quipped.
They both had a good laugh.
He was amazed at himself - one minute he was calm and joking, the next he would be perspiring and shaking from nervousness.
He pointed at her seat, now that he could see it clearly. "Holy crap! And who's going to clean that?" There was cum all over the place. She had literally cum a small puddle, and then she'd smeared it all around as her ass shifted around in her seat. Popcorn kernels were stuck to it everywhere.
She just walked away. "Oops. Let's say we didn't see that!" She giggled. She clung to him tightly and joked, "Good movie, huh?"
He laughed. "Yeah! My favorite movie of all time! What was it about?"
"I don't know!" she giggled.
Then he asked, "What was it even called, anyway?"
"Ummm..."
As he finished asking the question, he remembered that the title was "About a Boy." But he joked, "Wait, I remember. It was called 'About a Blowjob,' wasn't it?"
It wasn't the funniest joke in the world, but Katherine thought it was hilarious and laughed a long time.
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