Another huge THANK YOU to Lovefreely1993 for helping me edit this. Of course, all the characters in this story are fictional, do not intentionally represent any persons living or otherwise, etc. etc. No animals were harmed in the writing of this. All characters involved in sexual activities are 18+.
*****
My sister sat on top of me, her nude body glistening with a sheen of sweat. I slid my dick in and out of her quivering pussy, pushing her towards another orgasm. Her fingers dug into my chest as she crested again, her body trembling throughout. Jess collapsed on me, panting in my ear.
"Cum, big brother," she said playing up the taboo angle of our relationship. She did that occasionally, knowing how it excited both of us. "Cum inside me. Please."
Not that I needed any encouragement. I'd been fighting the urge to cum for a while, and her words broke my defenses. I wrapped my arms around her, holding her close as I released inside her.
"Oh yes. Yes yes yes," she whispered in my ear as she felt me cum. "Fill your little sister up."
We lay there, out of breath and soaked in sweat for several minutes. My slowly deflating cock staying in her as long as we didn't move much.
"You know." I said looking up at her, "You used to get upset when I called you my little sister. Used to argue that I was only thirty minutes older than you."
"Well, that was before you deflowered your sweet, innocent, little sister."
"Innocent? Oh, that's rich!" I laughed, getting a sour look from Jess.
"Oh you asked for it!" she yelled as she pounced on me.
The problem with being intimate with your twin sister is that she knows each and every sensitive and ticklish spot on your body. With practiced ease, she found them and attacked. I convulsed and contorted myself trying to get away, howling with cries of laughter. Oh, it was on.
I reached down and found her most ticklish spot and went for it. With a yelp, she jumped up and off me, clutching her midsection for protection. Something warm and wet splashed across my thigh as she did, and we both looked at a trail of my semen that had poured out of her as she leapt.
"See what you did?" we said in unison, breaking into laughter again.
We both laid our heads on the pillows and sighed, relaxing and holding each other. It had been four months since we got back from our Obsidian trip. Four months since we confessed our true love for each other.
"Whatcha thinking?" I asked.
"How glad I am Mom and Dad took that vacation."
"Especially since we have to pick them up at the airport, so no chance of them coming home early and catching us?"
"Exactly!" She said, stretching. "What about you?"
"Just marveling that it's been a little over four months now."
"Yep." she grinned, hugging me. "Still happy?"
"Exceptionally happy," I said, gently playing with one of her nipples. "So what do you want to do today?"
"Lay here and let you molest me all day long." she signed contentedly
"As much as I would love that too, we have afternoon classes."
"Spoilsport." Jess sat up, grinning. "But you know. It's not afternoon quite yet."
Jess slid down and took my semi-rigid dick into her mouth. Slowly, steadily, she sucked me back to fully erect. She was right, we had plenty of time.
*****
Later that night I woke up with a start. Reaching over, I felt the empty spot where Jess usually was. Jess had been sleeping in my bed almost constantly now. Our parents had long ago stopped checking in on us at night, especially since she would be in my bed half the time anyway. Still, we rarely slept nude when they were home and we took great care to act like we normally did. When they were gone, however, we had a lot more freedom.
I looked up and saw Jess sitting on the bay window bench, her face and pert breasts illuminated an eerie shade of bright white from the glow of her laptop.
"You okay baby?" I asked, surprising her a little.
"Yeah, just couldn't sleep," she said sadly.
"What's wrong?" I asked as I got out of bed and walked over to her.
Jess scooted up a little, letting me sit behind her. She leaned back and angled the screen so I could see as well. On the screen was the inmate page for Margaret. Her short cut blue-and-black hair was unmistakable. Her eyes were red and puffy, like she'd been crying before the picture was taken.
"Why are you looking at this?"
"I can't stop thinking about her Jace. I mean, why the hell did she do it?"
"I don't know. I've been trying to figure it out myself, but we may never know."
Jess reached around pulled my arms around her, kissing the back of my hand before laying her head back on my chest. Slowly, she shook her head and sighed.
"No. I can't accept that. I have to know."
"Unfortunately, there's only one person who really knows," I said pointing at the screen.
"Yeah," she said wistfully, then her head snapped up. "Yeah. Yeah, you're right. She knows!"
"No," I said reading her thoughts. "No. That's a bad, bad idea, Jess."
"Why? We can get the answers we need."
"Do you think you can face her?"
"Yeah, I do. I did when we were with the lawyers. This time she'll be behind glass and can't touch us."
"Maybe."