Thanks to SexyKitty_B for editing.
As you can probably imagine, I pumped my cock quite a lot over the next couple of days, thinking of my sisters and of everything we'd done. But even in my wildest fantasies, I couldn't have foreseen how lucky I was going to get that Thursday.
I hadn't heard from either of them -- not so much as a text -- so I was pretty nervous when they eventually showed up. Dad and I were in the garden, getting things ready for the BBQ, when a car horn alerted us to their arrival.
Barely a minute later, both couples walked into the garden. The guys greeted dad extensively and kindly, and blatantly ignored me - as usual. I didn't give a fuck, as I only had eyes for Jessica and Heather.
Jessica was wearing a very short, yellow summer dress, with a zipper that ran all across her back. Heather was wearing a short jeans jumper. For you guys out there; that's basically a short jeans dress with an open-sided bodice and suspenders attached to the front panel.
And when I say short, I do mean short. It barely covered her ass cheeks. My cock was instantly hard. Jessica was grinning widely and her smile only grew as she walked up to me -- after giving dad a hug and a kiss. Heather, on the other hand was timid, even more so than usual, and seemed even a bit unwilling to be there.
As Jessica was giving me a hug, she whispered in my ear, "Take us upstairs."
Surprised, I glanced at her as we broke the hug and whispered, "Don't you want a drink first?"
"Trust me, you want to take us upstairs, NOW!" she whispered, then turned and headed for the back door.
When Heather followed Jessica inside, after giving dad a hug and skipping me all together, I started to get worried. I quickly followed them.
"Hey, don't you girls want a beer or something?" dad shouted.
"Not right now dad, maybe later," Jessica replied, closing the door behind us.
Heather didn't stop and walked straight into the hallway and up the stairs.
"Jess, what's going on? Am I in trouble?" I whispered softly.
Jessica chuckled, ignoring my question and instead called out, "Take the master bedroom, Heather. His bed won't fit all three of us!"
I immediately calmed down -- realizing that I was in for a treat.
Heather stopped in the middle of the room, in front of the bed and turned towards the doorway. I stopped about two meters in front of her, while Jessica took up position in between the two of us - just off center, so we could all still see each other.
After about three seconds of awkward silence, I asked, "What's going on, you guys?"
Jessica briefly glanced at Heather and -- realizing that our sister didn't have the nerve to speak up -- started talking for her.
"In case you haven't noticed, Jack... our little sister is horny. Extremely so!"
Pleasantly surprised, I looked at Heather -- who nervously avoided eye contact.
Jessica, taking charge of the situation, sauntered over to her and unclasped her sister's left suspender, whispering, "You see, she told me about the little arrangement you guys made last time... in the bathroom, just before we left."
I remembered what she was referring to. Being in a rush, Heather had promised to let me fuck her -- if I came quickly, at the time. I had. It had been one of my favorite memories over the last week. Apparently, Heather had been thinking about it as well... quite a lot.
When I saw Jessica reaching for Heather's second suspender, I reached into my sweatpants and took out my massive cock. For a moment, both girls gawked down at it, clearly impressed by its size and hardness. I wrapped my right hand around the shaft and gave it a gentle pump.
Then, Jessica actually unclasped the suspender, causing Heather's dress to fall down onto the floor. To my surprise, she wasn't wearing any panties, just the white shirt. And since it barely reached her belly button, I now had a clear view of her pussy.
Heather gasped as she squirmed and shuddered. That's how horny she was.
"As you can see, the little whore isn't wearing any underwear," Jessica whispered, stating the obvious, as she gently squeezed one of Heather's erect nipples through her white shirt. "No panties... and no bra," she added, with a chuckle.
"Tell him why," Jessica continued, whispering our sister's ear.
"B... because..." Heather stammered.
"Look at him and tell him," Jessica pressured her as she squeezed her nipple again.
Heather forced herself to look at me and whispered, "Because I am a SLUT!"
"And?" Jessica asked, grinning.
The next part was clearly more difficult to say.
"Heather?" Jessica insisted, cupping both of her sister's tits from the back.
"I... I... haven't had sex with Nick since... since Saturday," she blurted out.
Wow, I thought to myself. It was Thursday.
"And why is that?" Jessica persisted, as she raised Heather's white shirt, exposing her big, round tits, "Was he perhaps not in the mood?"
Feeling her sister cup and gently wobble her knockers up and down, Heather couldn't help but gasp again, as she looked me straight in the eye.
"I didn't... let him," she admitted.
"What was that now?" Jessica teased her sister, "Speak up! Jack didn't quite get that."
I had understood her just fine, but I played along.
