A Different Kind of Party
Copyright© 2025 by Fanlon
Chapter 10
Erotica Sex Story: Chapter 10 - Tom and Mandy dreamed about what it would be like to go to a swinger party. When they received an invitation, they were ecstatic. There was only one little problem: that invitation came from Tom’s little sister, Stephanie. They would discover far more from their new friends than they'd ever imagined.
Caution: This Erotica Sex Story contains strong sexual content, including Ma/Fa Mult Fiction Brother Sister Group Sex Swinging Exhibitionism Oral Sex Voyeurism
I was the first one out of the shower because I kept the temperature down so I wouldn’t be scalded like Mandy was about to be when she cranked it all the way up. I had the towel wrapped around my waist as I walked into the bedroom. That’s when I noticed the door to the master bedroom was open about a foot or so. That wasn’t what tripped me up, however. What did, was the faint, barely noticeable soft glow of a light on somewhere in the house. No one else was here; there was no reason for a light to be on.
Then the details of earlier came crashing down on me like a ton of bricks. Mandy and my sister, Stephanie, had been drinking. They’d polished off a bottle of wine, and Stephanie even tapped into my scotch!
If Mandy was that tipsy, there was no way Stephanie was anywhere near sober enough to drive home. Oh fuck!
I spun, turning to look into the master bath. I’d left the door open, and steam was already wafting through the threshold.
She came in and fucked me, knowing Stephanie was just downstairs! Jesus Christ!
My mind started racing through scenarios, all of them leading to one huge, massive question. Did my sister just hear her best friend and me fucking? Mandy had been so loud. I wasn’t exactly quiet myself. Hell, the door was fucking open. She could have been watching for all I knew. I didn’t think that was likely, but you couldn’t rule out anything with it came to Stephanie. So, I just stood there, frozen, unsure of what to do.
On the one hand, what’s the big deal? We’re grownups, and this was my house. I could do what I wanted in my own damned house. On the other hand, it was my sister! Sure, she was at the party last night, and lord knows she knew every single detail of what happened. She knew we were having sex at Bruce’s, but there was a sense of privacy. We’d shut the door. As thin a barrier as it was, it was comforting to know not everyone, or anyone, could just peek in and see what we were up to. Tonight, that wasn’t the case.
“Why are you just standing there with that blank look on your face? Is something wrong?” Stephanie asked, standing in the doorway of the bathroom, naked, her body reddened from the scalding hot water as she toweled her hair.
I turned slowly towards Mandy.
“Is Stephanie here?” I asked, my voice eerily monotone.
“Yeah, why?”
“Mandy!”
“What?” Her hands, holding the towel on her head, stopped moving. “She couldn’t drive home, she’d had too much to drink.”
“We just had sex with my sister on the couch downstairs,” I explained.
“What’s the big deal?” She fired right back.
“She could have heard us!” I snapped.
“Tom, she’s passed out on the couch. She crashed before I came to bed.”
“Seriously?”
“Go see for yourself.”
“Oh no, you’re coming with me,” I said and walked over to where she was standing by the bathroom door and grabbed her hand, pulling her after me.
The fact we were both naked ... well, Mandy was naked, I was practically naked, aside from the towel wrapped around my waist, but that didn’t even cross my mind as something to consider before Mandy and I were sneaking down the hallway.
“She’s passed out,” Mandy whispered, barely loud enough for me to hear her. “We can just walk like normal people, you know.”
I turned and looked at her over my shoulder, my eyebrow raised questioningly. She just smirked at me, as if I were the one being stupid. “If she’s asleep, then why are you whispering?”
Mandy’s face scrunched up at me. “I ... she’s...” The corners of my lips twitched upwards as she stammered.
“That’s what I thought!” I replied, shaking my head with a big grin on my face.
“Oh, knock it off.” Mandy gave up all pretense at stealth and stomped her way to the stairs. Seeing her walk stark naked through the house without an ounce of shame was a sight to see, but not only that, she was moving in the direction of where my sister was supposedly sleeping. That seemed crazy to me, and I was thankful I had the towel wrapped around my waist.
“Mandy!” I hissed, my arm snapping out, fingers splayed to catch her, but she was already out of reach. “Shit!”
Mandy descended halfway down the stairs, looking in the direction of the living room. You couldn’t see into that room from the top, but you could see the whole room from about halfway down.
“See,” Mandy turned and looked up at me, reaching out her arm and pointing towards the couch. “Told you. Sound asleep.”
I slipped down the stairs and stopped right behind my girlfriend, using her body to shield my own.
“What are you doing?” Mandy snickered.
“What?”
“Why are you hiding behind me?”
“Because I’m—”
“You’re what? Naked?” Mandy put her hands on her hips, which only seemed to accentuate her nudity.
“Yeah!”
“You’re wearing a towel, you goof.” She rolled her eyes at me.
“Close enough.”
“You’re such a prude!” Mandy complained; her voice seemed to boom through the house. She wasn’t all that loud, but it seemed that way when everything was so silent.
“Shh!” I scrambled to cover her mouth to avoid waking my sister, who was, indeed, asleep on the couch.
“Come on, babe,” Mandy pulled my hand away from her face and revealing the silly smile that had been hidden a moment before. “Let’s go to bed.”
I looked back at the couch one last time, making sure Stephanie was well and truly asleep, before hurrying to follow Mandy to the bedroom and shutting the bedroom door.
“Seriously, Tom,” Mandy said the moment I closed the door. “You’re going to have to get over this thing with your sister.”
“I don’t have a thing...” I did have a thing, but I wasn’t going to agree and admit that I was being ridiculous.
“Yes, you do!” Mandy challenged. “First, you were paranoid that your sister heard us having sex. Second, you were scared she was going to see you naked.”
“What’s your point?” In for a nickel, in for a pound. I picked this mountain to die on, and that’s what I was apparently going to do.
“Seriously?” Mandy groaned, and I shrugged. “Fine, I’ll spell it out for you so you can keep up.”
“I’m listening...”
“Don’t act like I’m the one that being stupid right now,” Mandy glared at me. “Tom, where did we go last night?”
“To a party.”
“What kind of party?”
“A swingers’ party.”
“Exactly,” Mady grinned, looking like she’d just won a major battle in some secret war. “Who invited us to that party?”
“You know who...” I groaned.
“Who?”
“Stephanie.”
“What happens at swinger parties?”
“Lots of fun!” I grinned, but Mandy didn’t; she just glared even harder at me. “Fine, fine. Sex, we have sex with other swingers.”
“Exactly, and what is your sister doing while we were having sex with other people?”
“ ... having sex.”
“Mhmm,” Mandy nodded. “She knew what we were doing.”
“I know—”
“Tom, she knew exactly what we were doing. She was happy for us.”
I sighed, knowing and accepting that I was being overly dramatic about the whole, my sister thing. It was a thing, even though I’d been trying to deny it.
“It’s just weird...”
“Trust me, I know,” Mandy smiled. “But here’s the thing, we are going to be in the same place with her a lot. She’s going to have fun, just like we will. You’re going to see her naked at some point, just like she’s going to see you.”
“Don’t remind me!” I buried my face in my hands.
“If you think that’s bad, your sister is going to see us having sex.”
“Oh god!” I could feel the heat in my cheeks rising exponentially.
“She’s going to see your big, hard cock slamming into me or Beck, or even some other hot chick we find.”
“Mandy!” I whined. “Come on!”
“In case you didn’t know, you and your sister are hot,” Mandy explained. It was a small mercy that my mind didn’t immediately envision my sister naked right then. “The sooner you come to terms with that, the better.”
“It’s just ... I mean...” I paused, trying to formulate words to explain what I was thinking.
“I’m not saying we have to sit there and watch your sister getting fucked.” I winced, and Mandy grinned at my obvious discomfort. “Even if she is pretty hot to watch.”
“Come on!” I complained, and she started laughing.
“Tom, it’s not a big deal. I promise.” Mandy walked up to me, wrapping her arms around me and pressing her body against mine. I could feel breasts as they were pressed against me, and I could feel my cock squeezed between us. Her head tilted up to look at me. “She knows you’re going to see her in action at some point, and she’s not going to care, you know that, right?”
“Yeah, I know,” I agreed reluctantly, looking down at her beautiful face and meeting her eyes. I knew she was right, though. Stephanie wasn’t shy. She never really had been.
“When it happens, I’ll be right there with you, okay?”
“You better be!”
“Oh, don’t you worry,” Mandy giggled. “I wouldn’t miss it!”
Sleep didn’t come quickly. Mandy did, however, because after our little talk, she was fired up and wanted one more round before we went to sleep. This time, she wanted it slow and passionate. It didn’t take much encouragement to get me to agree to her needs. She welcomed me on top of her, my weight settling between her thighs.
We made love, slow and passionate. Each movement and thrust was with purpose. Our eyes were locked on each other the whole time, and neither of us ever looked away. No matter how I rolled my hips, I thrust my hardness into her depths as far as I could reach. Not even when she shifted and adjusted so that I hit those deep spots inside of her just right.
We moved like we were in a scripted dance, a well-practiced routine. The two of us locked together like we were meant to be. Each movement and sensation sent waves of pleasure through both of our bodies. What made it so magical was how neither one of us sought our own peak. No, when we made love like this, the peak was shared, only attainable when the two of us reached it together.
When the moment came, it was easy. As I flooded her depths with my seed, she cried out, her core flexing and gripping, drawing everything I had to offer into her waiting embrace.
Our lungs heaving, we kissed. It wasn’t one of those kinds of kisses where our tongues battled for position. This was one of those times when we both were content with what we had, our arms wrapped around each other, as our bodies remained connected.
“God, I love you,” Mandy said, her breath coming in gasps as her chest heaved beneath me.
“I love you more,” I replied, kissing her again before pushing up on my hands, stretching out my arms, and lifting my weight off of her.
“Never!” she smiled, continuing the battle we had started ever since the first time we had declared our love for each other.
Without needing to be told, I moved from between her legs. She rolled over onto her side, her hand open, fingers waiting for my arm, which snaked its way around her, and she grabbed onto it, holding it between the firm pillows protruding from her chest.
“Goodnight,” I whispered, nuzzling my nose into her hair.
“Goodnight,” Mandy replied, wiggling just enough to ensure every inch of her back was pressed firmly against me as both of our breathing slowed and we fell asleep.
The sun hadn’t risen yet when I woke up, my eyes blinking open slowly but quickly adjusting to my surroundings. Even with our late-night lovemaking, I woke up feeling refreshed. The memory of her cries as she came last night replayed in my mind. My morning wood strengthened in anticipation. I was tempted to wake Mandy up, using the head of my cock to slide and nudge at her cleft from behind. She would have allowed it, she always did, but it was too early for her to truly enjoy it. It would just be for me. A quickie, as she liked to call it, just to get my rocks off and then get up out of bed.
I lifted up, resting my weight on my elbow, my hand on my head. She was sound asleep. Peacefully dreaming whatever it was she dreamt. I smiled at how beautiful she was, and how lucky I am to call her mine. I decided to let her sleep, sliding out of bed and padding quietly into the bathroom to get cleaned up for the day.
Dressed, I headed down to the kitchen to make breakfast. Something I enjoyed doing, waking her up to the smells of bacon or the like.