Thanks to SexyKitty_B for editing.
Kim and I just stood there for several long seconds, me staring at the empty staircase, while she was gawking at the cum-drenched glass sauna door.
"Fuck, that was hot!" she suddenly blurted out, raising her long, chestnut hair with both hands, clearly horny as fuck. Then, as she lowered her hands, she ran them over her chest, grabbing her perky young tits and juggling them up and down for a moment.
"What do we do now? Do we go after him?" she asked, eager for some more action.
"Patience little one," I smirked, "No need to rush things. Men are delicate creatures. We'll have to take it slow."
Reluctantly, she followed me back into the cabin and sat down across from me, like before.
"Shall I turn on the sauna?" she asked, glancing over at the control panel.
"No, it's hot enough in here as it is," I replied, as I gently began rubbing my clit. She smiled and started doing the same.
Unashamed and remarkably at ease around each other, we masturbated for over fifteen wonderful minutes and made ourselves cum, again, right there on the wooden sauna bench. It felt so naughty, yet so rewarding to climax in front of my girl and then to see her do the same.
"So, what exactly is the plan?" Kim asked, as she was catching her breath.
"Well," I replied, "Now that he knows that we know, I think it's important that we act normal around him, except for our little sauna visits... if we start coming onto him outside of the sauna before he's ready, we might scare him off."
"And then we take things further," I added.
"Further? You mean..."
I just smiled at her, giving her the answer she needed.
"God, we're such sluts," she whispered, fighting a grin. And with that comment, I knew she was fully on board. I returned the smile.
"How long do..." she started to ask, but went quiet as we noticed Kirk sneaking back up, not bothering with hiding another enormous tent in his boxers. Although he was clearly very nervous -- now that he knew that we could see him -- he didn't have too much trouble with getting on his knees in front of the sauna and pumping his big cock.
"I don't think we have to worry about scaring him off," Kim whispered, smiling at her brother.
"No," I whispered, staring at my boy's fat cock "I guess not."
"New plan," I whispered, after pausing for about ten seconds, "We'll be the biggest sluts we can be for your brother."
"Deal," Kim whispered, no longer pretending to be shocked or playing hard to get, and just slid off the bench, getting on her knees right in front of the glass door. Kirk stared at her as she opened her legs as wide as she could and started playing with herself. At first, she just squeezed her boobs and stroked her clit for a bit, but after a few minutes she moved on to the real stuff. She slipped a couple of fingers in her wet twat and started pistoning them in and out for his viewing pleasure.
With that kind of view, I didn't take poor Kirk long to start shuddering. Kim immediately tilted her head back and pretended to convulse, trashing and rocking her body back and forth -- seemingly having an orgasm herself. However, she was -- I suspected -- simply putting on a little show for her brother. Kirk didn't know -- and didn't care -- and exploded violently, groaning loudly and flung his juicy load wildly all over the glass door.
After he'd finished, he simply hung his dick back in his boxers, turned and walked down the attic stairs. Kim promptly stopped her little performance, confirming my suspicion that she hadn't actually climaxed. She sat back down on the bench beside me and joined me in staring at the dozens of ropes and drops all over the door.
"So, I guess he simply expects us to clean up behind him now?" I whispered.
"Is it wrong to be turned on by that?" Kim asked, tugging her left nipple pretty hard.
"No," I replied, still staring at his goo, "I guess that's basically all we're good for."
"Jesus mom," Kim replied as she closed her eyes and started rubbing her clit again.
Horny, but not in the mood for another cunt fest, I got up and opened the door.
"What are you doing?" she asked, surprised that I was leaving.
"I am going to suck off your father," I replied, "If I don't get some fresh sperm in me, I'll probably end up licking these two loads off the glass."
"Fuck," Kim whispered, biting her lower lip, "That's not a terrible idea."
"Have fun," I smiled.
"You too," she replied as she leaned in towards the glass, slightly hesitant. I headed down, passed by the master bedroom to put on a night gown and found Kent in front of the tv. I was down on my knees, sucking his big shlong before he could reach for the remote and pause whatever he was looking at. I fiercely bobbed my head up and down, giving him an extremely sloppy blowjob.
Little did he know that I was thinking of Kirk the whole time, imagining that it was his fat cock I was servicing, and his goo I was going to swallow. I had him spurting in my mouth in just a few minutes. I eagerly swallowed it all, and then laid down on the couch, my head in his lap, genuinely enjoying the aftertaste of his load.
He caressed my head for a little while, before dozing off. When I was sure that he was fast asleep, I slowly got up and snuck back upstairs. I was eager to check up on Kim, wondering if she'd actually gone through with her idea of licking up her brother's sperm.
When I noticed, at the bottom of the attic stairs, that it was all dark up there, I tiptoed over to her bedroom and carefully opened the door. I grinned when I saw her lying on her bed, dressed in a very short plaid skirt -- which had been pulled up for access to her twat -- and a white top that was easily two sizes too small for her rack -- and therefore didn't even cover half her tits.
With her right hand she was pumping a dildo in and out of her sopping twat, while her left hand was wrapped around an even bigger dildo she was sucking on. She groaned and squirmed as she noticed me come in, but didn't stop what she was doing. I closed the door and slowly approached her, gawking at this incredibly sexy scene.
"Need some help?" I whispered softly as I approached the bed.
"Yesss," she hissed as she stopped sucking on the bigger dildo -- letting it fall onto the bed -- and started working the other plastic cock with both hands. I got down on my knees and ran my hands over her tummy, her tits and her arms, making her shiver and tremble.
"Did you clean up the upstairs?" I asked.
"I licked up every drop, from the glass and the floor," she blurted out proudly, "Did you... do dad?"
"He never knew what hit him," I grinned, squeezing both her tits, "He's out like a light."
Pleased with that answer, she squirmed and moaned some more.
"What's with the outfit?" I asked, as I tugged her right nipple, "Weren't you naked before?"
"Aaron got it for me, last Halloween," she replied, referring to her boyfriend, "But I never wore it."
