All persons in this story involved in sexual situations are 18 years of age or older.
*****
Part One
When I woke up, I was pleasantly surprised to feel my lovely wife's warm body still snuggled up to me with her hand on my sprouting cock. She was fast asleep but with the way we had concluded the evening last night it was no surprise she wasn't up bright and early for her morning run. We were both exhausted.
I slipped out from under her and quietly went downstairs to eat some breakfast. The house was quiet even though the sun had been up for at least an hour. I made a bowl of cereal and sat at the kitchen table, content to be alone with my thoughts for the time being.
What the hell was I going to do? That was the question that I didn't have an answer for as of yet.
The silence was soon interrupted by the sound of someone approaching. It was Katy, dressed in her running tights. She was beaming brightly when she saw me sitting there, by myself.
"Morning," she said, showing off her tight body as she walked toward me.
"I don't think Adrienne is going for a run today," I said.
Katy didn't seem too disappointed as she put her arm around my shoulder and kissed me. I instinctively reached for her stomach and snaked my fingers down into her tights. Just like old times, constantly pawing at each others' bodies every chance we got. I slid my hand down her mound and sunk a finger into her cunt, making her moan.
"Naughty," she whispered. "Are you gonna tell me about last night?"
I withdrew my hand and tasted my finger before answering. "It was pretty crazy."
She sat next to me at the table and waited eagerly for me to tell her the details. I teased her by eating nonchalantly like I wasn't excited to tell her.
"She wanted to pretend that we were brother and sister," I explained. "Since she knew that you and I messed around as kids, at least a little, she made me call her Katy."
"No fucking way," Katy said in shock. "And you did it?"
I nodded. "She was on fire when I did that. I swear, we never did that kind of thing before."
"How many times did you cum?" she asked.
"Twice. Not including the blowjob on the couch before dinner."
"Fuck..." Katy trailed off right after saying that indecent word, due to footsteps coming from the stairs.
We both turned to see our mother gently tiptoeing across the floor so as not to wake anyone. She saw the two of us in the kitchen and beamed brightly.
"Good morning sweeties," she said, coming to kiss us both on the head. "I'm so glad to see you two chumming it up again. You used to be so inseparable!"
Katy sheepishly smiled at me, and I just chuckled to myself. If she only knew...
"Hey Mom," I began, "Adrienne is still asleep, and I was wondering if you'd mind keeping an eye on the munchkin when she gets up so Katy and I can sneak off to get some Starbucks for everyone."
"Ooh, good idea!" Mom agreed. "Sure dear, go ahead."
I threw on some sneakers and hurried to the garage, but Katy was light years ahead of me. She was being a little too obvious, I thought, but then again it wouldn't arouse any suspicion. Her eagerness was flattering to me and I would be lying if I said that I wasn't getting wood already just thinking about being alone with her.
We made it out of the driveway before I felt Katy's hand reach for my crotch and grasp my stiffening cock. I just rolled my eyes, but my loins were stirring.
"You didn't finish telling me," Katy demanded as she stroked me through my shorts.
"Just remember I'm driving," I warned. "We've never done it like this before."
"First time for everything," she said, and started masturbating through her running tights simultaneously. "Besides, I'll probably cum just hearing the details. Then we can pull over somewhere and fuck."
Damn, it was just like we were teenagers again. We were reconnecting after three years with a magnetic pull that couldn't be denied. Our separation was having a rubber band effect, propelling us back into each others' arms with more force than we had used to pull ourselves apart. And she was right, we were going to fuck as soon as possible. Probably before getting Starbucks, since I didn't want our drinks to get cold.
Katy brought herself off in the car as I told her about my sex with Adrienne in full sordid detail. I could smell her sickeningly sweet pussy as she fingered it. That smell drove me wild. I told her about how Adrienne loved pretending to be my sister as I pounded her from behind with my thumb in her ass. I was extra rough, which for us only meant that I barely broke a sweat, but it was enough to invigorate us both into wonderful orgasms. Then we cuddled and I told her more of the harmless details of my incestuous play with Katy, sans the actual facts of how long it continued for. That got her riled up for some ass licking and anal sex. God I loved eating her ass and then fucking it. I came deep inside of her bowels and she held me there for as long as I could stay hard.
I finally pulled over into an alley a few blocks from our destination and found a spot that couldn't be seen from the street. Katy pounced me and tore her tights off as she clumsily found a spot on my lap to straddle. She fought with my shorts to free my erection but once she did it quickly disappeared into her tight cunt. She grunted at the self-imposed intrusion but rode me as hard as she could in the tight confines of the driver's seat.
Her mouth found mine and she hungrily pressed her tongue into mine. After some intense mating in this manner, she calmed down a bit and kissed at my neck. She started whispering into my ear, which I could not recall her ever doing before.
"I should feel jealous," she said softly, "but it actually excites me that you're fucking your wife and you're both thinking of me the whole time."
I moaned and she seemed to squeeze my cock extra hard at the same time. I almost lost it but I was too interested in hearing what else she might say, so I bit my lip and held out. Her slick pussy felt so heavenly as it caressed my shaft, I never wanted this to end.
"What if she knew?" Katy asked, continuing her whispering taunts. "What if someone else finally knew what we were? Imagine the release of it, our deep dark secret getting out like this, and not getting in trouble but only making it more exciting..."
She was forced to trail off as her climax approached. She groaned as it overtook her body and temporarily paralyzed her. I held her hips and thrust up into her hard, trying to fill her completely full of cock as the waves overwhelmed her. Her eyes were clenched shut and she was thoroughly enjoying this. I let her ride it out without interruption, except for my penis moving further and further into her depths.
She caught her breath and went back to kissing at my neck.
"Are you going to tell her?" she asked, still whispering into my ear.
"Tell her what?" I replied.
Katy pulled her face back and looked into my eyes. Her expression betrayed intense arousal but also a strange excitement at the prospect of our secret being known.
"About us," she answered. "About this."
We were still fucking, and I was still close to unleashing a torrent of seed into her tight channel, but the question hung in the air between us demanding attention.
"You want me to?" I asked, genuinely curious as to her intentions.
She nodded. "Yes! God yes, I do. I don't know if you should, but I want you to so bad. Don't you want to tell someone?"
I gritted my teeth, dangerously close to losing it. Was our sex clouding my judgment? Was I about to agree to something I would later regret? Bless my dear sister, she could almost read my mind.
"Cum first," she said before I could answer her. "Get it out, then we'll talk about it. Go ahead, cum in my pussy."
She humped against me extra hard, and I finally threw my head back and groaned deeply. I grabbed her hips and held her down hard on me, and she struggled to keep moving her wet cunt in protest, but I could hardly take the sensation as I filled her with cum. It was so intense, like a white hot spike in my loins. The forbidden nature of our sexual relationship always did that, always made it better in that special way. I felt her hand snake around my neck and gently caress me at some point, but I was not fully aware at the moment. I had to let the pleasure have its way with me, with my mind and with my penis, leaving me a writhing and grunting mess beneath my loving sister.
When my head was clear again, Katy was staring at me with those gorgeous eyes of hers. She was happy for me, that I had experienced so much pleasure from her body, but the unanswered question was still hanging there for us to consider. She wouldn't let it go. It hadn't just been the aroused talk of passionate sex, she had really meant for us to discuss it.
"What would I possibly say to her?" I asked with a deep satisfied sigh, pandering to her curiosity for the moment.
She was gently playing with her clit now, savoring the wonderful feeling of her brother's big cock filling up her tight space.
"She's obviously into it," Katy replied.
"It could just be a fantasy for her," I countered. "If I tell her how far it went, it could scare her off. I have a lot to lose here."
Katy leaned forward and kissed me once on the lips, in a reassuring gesture. "I know, I know. But there could be so much to gain. I could move here and be with you again, and it wouldn't take away from your marriage. It might even add something to it, and to us."
I sighed again, somewhat in exasperation and in pleasure at feeling Katy's tight pussy still wrapped around my shaft.
"What do you want me to say?" I asked.
"She's your wife," Katy said with a smile. "Only you can know how to broach the subject. But from what you've told me, I don't think it would end your marriage if you revealed that we have gone further with each other than the normal kid stuff."
"Should we really do this while Mom is here?"