All characters engaged in sexual activity are 18+
The moaning woke me up though I wouldn't realize it until later. I'd been dreaming so I started out dissoriented and still was when I opened my eyes and saw unfamiliar walls around me. Then I remembered the trip. The hotel. My brother and my sister.
Every summer we would make the journey from Minnesota to Gulf Shores to visit our father. He'd traveled a lot on business and ended up falling for a southern belle half his age and left all of us when I was 12. It was easy to hold a grudge against him, but that didn't stop the three of us from taking advantage of his fancy house on the Gulf of Mexico.
In past years, Mom had put us all on a plane, warning my older siblings to take care of me. Now that I was 18, she reluctantly let us all drive down. She was she just as teary when it came time for us to leave even though she officially had three adult children.
The twins, Mike and Maddie are three years older, were on the cusp of turning 21 during our trip, and were so close, I often felt like a third wheel. That was even before I woke up in a hotel, somewhere near St. Louis, to the sounds of sex.
I'd started to get up to pee when I came fully awake and realized what was happening.
"Shhhh Maddie," my brother whispered, but my sister didn't relent.
I slowly turned my head towards the other double bed. Maddie was supposed to be sharing mine with me. She was beside me when I fell asleep, but just then she was in Mike's bed. Under him. Under the thin sheet.
Behind me, we'd left the bathroom light on and only partially closed the door in case we woke up in the night. Because of that, I could see pretty clearly though we were all laying in shadows.
He was looking down at her, but her eyes were closed. His jaw was slack and now that I was looking at him, I could make out his quiet, ragged breaths.
I couldn't see much of Maddie except her face and shoulders. Her arms and legs weren't even obvious, wherever they were under that sheet. She was still, and may have been confused for asleep if she wasn't making noise.
"Fuck me," she whispered. "Fuck your sister's tight little pussy."
"Fuck." Mike turned his head to look at me so I quickly closed my eyes. I opened them again when he moaned. "Please be quiet," he said to our sister.
His body moved under the sheet, forcing my eyes down to what I knew was his ass, his hips, thrusting downward where Maddie lay under him.
I was a virgin, but I knew what sex was, had watched porn, had listened to my friends go on and on about their own experiences, and even made myself come with my fingers a few times. I'd never seen anyone do more than makeout in person though.
I'd suspected Josh Nielson had his dick out one time while my friend Emerson was sitting on his lap in a skirt, but I had no confirmation of that. My only other experience was the night Tim Halloway convinced me to show him my tits and watch him jerk off. I had. It was also one of the nights I'd touched myself once I was alone in my room.
I couldn't deny that seeing two people fucking was turning me on, but I didn't know what to do with the fact that they were my siblings. Little things I'd paid no mind to, suddenly made sense.
Mike had blown up at Maddie for making a date with someone named Shane. She hadn't gone. I'd also seen Maddie going in or coming out of Mike's closed door several times. Not to mention the times I would come home and hear doors slam as I climbed the steps to our rooms.
"I'm close." My sister's arms came out of the sheet. She fisted Mike's hair and pulled his face down to hers. Against his lips she repeated, "I'm so close."
"Come, baby."
They kissed. I could see their tongues touch and snake together before hiding behind their lips. That, more than anything, made my belly fill with butterflies.
Maddie whimpered and it made Mike suddenly pull his mouth away and whisper, "Jesus."
Everything under the sheets stilled for a minute and the room fell silent. I closed my eyes again, worried they may have stopped because of me. What would I have even said if my eyes opened to find them both staring at me. They'd be angry, no doubt. What they were doing was wrong and they hid it for a reason. Would they threaten me to keep quiet? Would they try to buy my silence? Would I ever tell anyone what I saw anyway?
All my thoughts were interrupted when they released their breaths. Hard, panting sounds accompanied the slap of their bodies, louder than before.
Laying there, listening without the shock of seeing something I was never meant to see, made me suddenly aware of my own body. My hard nipples brushing against my loose tshirt everytime I took a breath. Wetness was pooling between my legs which I'd clamped shut at some point effectively squeezing more arousal from my pussy.
I wanted to touch my clit so badly. I was terrifed of, and yet tempted by, one thought. They might notice. Would they still be mad at me if they knew how much it turned me on to watch them fuck? Would they let me watch them again sometime? Or would they make fun of me like they often liked to do?
In the end, nothing mattered. I needed relief from my own taboo thoughts. I slid my hand down the side of my body before moving it up and over my hip. Nothing but wet panties awaited my arrival.
As slowly as I could, I spread my legs open once again. I didn't dare open my eyes or I wouldn't be able to deny the reason for my movements should they be discovered.
Once my hand rested over my mound, I stilled. The fucking and breathing and slapping sounds continued. Then the sound of wet lips dancing together and pulling back joined the symphony they were composing.
I braved a quick swipe of my finger, over my clit, through my panties. I bit the inside of my cheek instead of moaning like I wanted to. It was going to be so easy to make myself come. Faster than I ever had, I was sure.
I slid my fingers under the elastic of my cotton underwear and made contact with my wet, fleshy lips. Unlike previous times, I didn't need to part them and search out my own clit. I felt stretched open already, waiting for some sort of penetration I had never felt. My clit was hard and needy, standing out above my weeping hole. So sensitive.
"Feels so good," Mike whispered as if he could read my hidden pleasure.
"Harder," Maddie moaned.
