Thin Walls

Hey everyone. First I just want to say thank you to everyone that's read the first few chapters. The response has been really encouraging, and I'm glad you all like it.

I know it's got plenty of build-up, so thank you for your patience. I love taboo stories, but I also love a bit of realism, so I'm trying to balance both in every chapter.

I was able to post the first three chapters in quick succession because I largely had them all written before I submitted the first one. But from here on out updates will be slower.

And finally, thanks for all the encouragement and criticism in the comments. I really do appreciate it. But if you bring any homophobia or bi-phobia into the comments, it's going to be deleted.

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Sydney and I had just had sex after our first sexual experience with Emma, or at least the first one not separated by a thin wall. While Emma and I hadn't even touched it had been a huge moment for all of us. Sydney and I were both breathing heavily after a particularly intense fuck, and I was staring up at the ceiling as she laid her head on my chest.

"What are you thinking about?" She looked up at me. I think she knew full well what I was thinking about, at least the rough details.

"It's not obvious? But yeah, I mean... that was a lot. I guess I'm wondering if this changes anything... everything."

She nodded, understanding. "Are you... I don't know... having regrets?"

I took a long moment to consider that. Then I shook my head.

"No..." Another long moment. "How do I put this?" I blinked a few times as my eyes scanned the ceiling. "Would I change anything we just did? No." I licked my lips. Maybe it was just in my head, but I felt like I could still taste a bit of Emma's juices from my kiss with Sydney. "But... am I sure I'll never regret it? Look... it'd be an understatement to say she's one of the most important things in my life. She knows me better than anyone. She's been there for me for literally my entire life. What could be worth jeopardizing that?" I sighed, and you could hear a pin drop in that room.

"On the other hand, if you told me there was a way for us to get even closer, to deepen our connection... how could I pass that up? I uhhh... I don't know if that answered the question." I turned my attention from the ceiling to Sydney, only to find that the entire time she'd apparently been looking at me with pure adoration.

"I fucking love you," she said, as her big doe eyes fluttered. "Sorry... yeah... I get what you mean. And honestly, I'm glad to hear you say that. Because I love her too, and it's exactly the same. I've never had a friend like her. And, fuck, who knows what this'll do to the friendship."

"But you're not backing out?"

She smiled, a devilish glint in her eye. "Hell no. Are you kidding? I wanna know what's going to happen next."

I couldn't help but match her smile. "Me too."

"We'll take it one step at a time. We'll figure it out together. Ok?"

"Ok." I would follow her into a burning building.

She looked up and grinned.

"Good. Now I need a nap, and then some food."

"Amen."

"And, I'll talk to her later, and let you know what's next."

I squeezed her hand. "Sounds like a plan."

And so, as the smell of sex permeated our room, we fell asleep.

When I woke up, the house was dark and quiet. A quick look at my phone told me we'd slept right through dinner time into the middle of the night. Sydney was fully out, but my stomach was rumbling. So, doing my best not to wake her, I slid out of bed, put on a pair of boxers, and walked out to the main room.

There I found I wasn't the only one in search of a midnight snack. Silhouetted against the light of the open fridge in the dark room was Emma. In this light I could tell she was wearing no more than panties and a sports bra. It wasn't lost on me that she was wearing less than she'd been when I watched her cum on my girlfriend's tongue.

I cleared my throat to let her know I was there, hopefully without scaring her, before turning on a light to the lowest dimmer setting. She turned and smiled at me. "Cold pizza?"

"Perfect."

I grabbed a few glasses and filled them with water as she set the box on the table. We sat down and grabbed slices straight from the box.

For a minute or so we just sat in silence, save for the sound of our chewing. After a gulp of water, I spoke.

"So uh... how are you doing?"

She shrugged. "Alright." She swallowed her bite. "This is a weird situation."

"Yeah."

"Like... how does this work? I mean... is it a one time thing?"

I shrugged. "If you want. Or if you're uncomfortable with it, that's totally fine."

"I'm not uncomfortable... I just don't really know what it means."

"Yeah... me neither."

"Do you want it to happen again?"

"I... I'd have to talk to Syd."

Emma shook her head. "I'm not asking Syd, I'm asking you."

"It's up to you, Em."

She chewed on her slice of pizza.

"You're avoiding the question."

I laughed and then sighed. "Yeah, I guess I am."

"So?"

"I'd be lying if I said I wasn't into it."

"I see."

"How are you feeling about it? Was it..." I didn't know how to finish the sentence, or even if I should.

"Was it what?"

"Ok? Like, did you enjoy it?"

Emma chuckled and shook her head. "Do I really have to answer that?"

"What? It's a valid question!"

"I mean... you were watching. You know... Yes ok? I liked it."

I smiled but Emma seemed a bit flustered. I put my hand out close to her, palm up.

"Hey..." She looked at my hand, and then at me. I nodded toward my hand, and she put hers in mine. I squeezed it. "I didn't mean to tease you... Or maybe I did." She laughed. "But I love you, ok?"

She nodded. "I know... I love you too, Ben."

"And whatever happens, I just want to make sure you're good, and happy, and safe."

"Thanks, Ben. You're a good brother."

"You're a good sister."

She laughed. "Yeah, sure, I'll just add that to my list of accomplishments. 'Great at sex, and a good sister.'"

I laughed and joined her. When we finished, I stood and brought our plates and glasses to the sink. I turned back and looked at Emma, illuminated by the dim kitchen light, and she looked at me. She stood, and we moved towards each other, knowing without speaking that we both needed a hug. It was perhaps more skin to skin contact than most brother-sister hugs, but it wasn't sexual. She pressed the side of her face to my shoulder, and breathed deeply out.

"I've got you." I whispered.

"We've got each other."

"No matter what."

She looked up at me. "Even through... whatever this is."

I nodded and smiled, and her smile back at me told me everything was ok. For now at least.

"Good night, bro."

"Night, sis."

I went back to bed and cuddled with Sydney. She murmured something sweet, and I kissed her head.

The next morning I woke up late, with the sun already shining through the blinds. I heard sounds coming from the living room. The space beside me in the bed was empty. I walked out of my bedroom, rubbing my eyes and yawning.

There I saw my sister and girlfriend sitting on the couch, their hands busy working on a jigsaw puzzle.

"Morning," Sydney said with a big smile.

"Mornin'"

"I was about to send a search party." Emma grinned.

I rolled my eyes and headed towards the kitchen. Emma called out, "Hot water in the kettle." We were a tea-drinking household. I prepared myself a mug and wrapped my hands around it to warm me up as it steeped before joining the girls on the couch.

We passed the morning finding all the edge pieces, sipping tea, and generally being exceedingly normal. At one point I sat back and looked at these two gorgeous women in cozy weekend clothes, giggling and telling stories as they worked on the puzzle. No one who observed this scene would know that less than 24 hours ago this trio had danced up to the line of polyamorous incest.

Syd glanced at her phone and her eyes widened. "Shit, I gotta run. Work calls."

"Aww."

"You'll survive."

She hopped off the couch, grabbed her purse, and blew me and Emma a kiss. "See you later, loves."

"Bye."

"Later."

And with that, I was alone with my sister. We shared a glance, but we both knew there wasn't much to say, and nothing new would come of a conversation. I had a work shift of my own later in the day, so I leaned over to kiss Emma on the cheek before heading off to clean up and get ready for the day.

When I got out of the shower a text was waiting for me from Sydney.

"I talked to Emma before you woke up. How bout I buy you a round after your shift to give you the deets?"

I responded with a thumbs up and a heart and headed out to work. Again it was nice to quiet my thoughts with the fast pace of work. Toward the end of my shift Sydney showed up, looking sexy and confident in a leather jacket. Her fair skin and short blonde hair were like a beacon in the dark bar, and she immediately turned some heads. But she only had eyes for the man behind the bar.

I poured her a gin and tonic without her having to ask, and told her I'd be a few more minutes. Rather than sit at any of the open spaces at the bar like she usually would, she took her drink to a booth near the back, underneath a speaker and far from the other patrons. Perfect for a conversation we didn't want overheard.

A few minutes later I handed off control of the bar to my replacement, poured myself a whiskey on the rocks, and joined her.

She raised her glass. "Hey hotshot."

"Hi, babe." I clinked mine against hers as I settled in.

"How was work?"

"Same ol' same ol'." She nodded. "And you?"

"Same." She sighed. Done with small talk, she looked me in the eyes. "Well, I had the chat with Em."

I leaned in, eager and nervous. Syd continued.

"First I just checked in on how she's feeling. She told me you two talked in the middle of the night, and that helped calm her nerves. But she said she was definitely still feeling conflicted."

I nodded and took a sip of the cold, bracing whiskey. "Yeah that makes sense."

"It does. But she also echoed a lot of what you said to me last night. Concerns but not regrets. Intrigued, not disgusted."

"That's good."

"She asked me about how I felt, and what I thought we should do next."

"And you said...?"

"Well first of all, I reminded her that whatever happened, it was up to her. And that we'd support her either way. But... we were all into it. I suggested, or, I guess, I proposed that we should do it again. Nothing til the weekend, so we can all sit with it and make sure it's what we want."

I couldn't help but feel a little thrill at the prospect of another night like last night. I smiled and Syd smiled back.

"So did you two talk about what 'do it again' might actually entail?" I think Syd could hear the eagerness in my voice because her smile widened, that classic mischief behind her blue eyes. But she shook her head.

"We didn't really get into it. I got the sense she may have wanted to talk about that but wasn't ready to talk about it yet. And I didn't want to push her." I nodded, definitely wanting Emma's comfort and agency to be protected. "I think we'll have to assume the same rules as before, until she says otherwise."

"Sounds smart."

"And... I did talk a little about you."

"Oh?"

"I asked her what she thought about you watching."

I took another gulp of whiskey, and asked, "And?"

"She got a little embarrassed. I think she was dealing with some guilt at the fact that she liked it. I told her I knew it was strange. Maybe even a little wrong. But that we were all three dealing with those feelings... and that we were all into it. I think hearing me talk about how hot I thought it was helped her. Like a voice from the outside tell her it was okay to feel this way. Eventually she admitted she didn't think she'd ever cum that hard, and that part of it was looking into your eyes. I told her I knew what she meant. I love cumming while looking into your eyes, too."

Sydney was looking deep into my eyes, in that way she sometimes did, as if she could see inside me. And her eyes were on fire. I think if we weren't in a fairly busy bar, she would have torn off both of our clothes right then and there. I briefly fantasized bending her over the table, glass and liquor sloshing and falling to the floor.

But then there was a little crack in her demeanor. Her confidence dropped and I could see some uncertainty in those blue eyes. "There's one more thing..." I reached out to hold her hand. "... she kissed me again."

I frowned, wondering why she seemed so worried to tell me that. I thought we'd already addressed how hot I thought this all was.

"I kissed her back. We made out for a bit." I think Syd saw the look on my face, and understood I wasn't angry. She relaxed. "I guess I just didn't know if that was okay... you know outside of the established scenarios we've talked about."

I squeezed her hand and smiled at her. "You're sweet to worry about that. And you're right, we should always talk about stuff like this, especially because it's all so new and uncharted." She nodded at me and took a deep, calming breath. "But... no, it doesn't bother me. Maybe it should!" We both laughed. "But it doesn't. I love that you two are close."

Syd giggled. "Close... Is that what you'd call it?"

I shrugged. "I'm not exactly sure what to call it."

"Me neither."

"And honestly... I kind of love it."

Now it was Syd's turn to squeeze my hand. "So do I."

I shook my head. "So no, it doesn't bother me. It turns me on."

A sparkle of light glinted off Syd's nose piercing and in her blue eyes. "It turns me on too."

"Then I don't see what the problem is."

Syd smiled and let go of my hand to raise her glass again. "I guess there isn't one!"

I smiled and raised my own glass. "To my girlfriend and my sister's budding relationship." We laughed and clinked our half empty glasses, and then downed them. I wondered what the other bar patrons would think if they'd heard that particular toast.

We wrapped up and headed off back home. Sydney grabbed my arm, and pulled herself close to me.

She looked up at me. "What are you thinking?"

"About how much I love you."

She smiled and nodded, but as always could nearly read my mind. "And...?"

"And how you're going to get fucked so good tonight."

Syd gasped. "Promises, promises."

We went out for dinner at a favorite spot, and all night we had trouble keeping our hands off each other. Whether it was holding hands over the table or playing footsie underneath it, we were almost constantly playing with each other. It only ramped up when we went to a bar afterwards, pinching and groping each other out of view of the bartender and our fellow patrons.

Only when our arousal was at a fever pitch did we return home. The apartment was dark, so as we headed to my room to tear each others' clothes off I couldn't help but wonder if Emma was out on the town or just on the other side of that wall, listening. Sydney caught me looking over at the wall, and she walked right up to me, grabbed my chin, and turned my face to hers. She wasn't angry, a mischievous smile stretched from cheek to cheek. But her intent was clear. Tonight was about us. Me and her. Wordlessly I nodded, and we both got back to disrobing.

Once nude we made out for a while and just let our hands explore each other. In comparison to some of our recent encounters we were much less rushed and much more quiet. We weren't putting on a show for anyone but each other. She pulled me back towards the bed, laid herself down, and beckoned me between her legs. I took no extra convincing.

We both sighed out our pent-up tension as I sank into her. Sydney's face was flushed, her breathing quick, and her eyes wide as our pelvises met. She pulled me down on top of her, and I held her tight, pressing myself down onto her. We just relished the feeling of being as physically close as two people could be. I could feel her chest rising below me, and she could feel my heart beating as it sent blood to the rock hard rod inside her.

After a moment I pushed down on the bed on either side of Sydney to pull back without removing myself from her. I just looked down at her.

"Fuck, you're hot."

She giggled. "You're not so bad yourself." She brought her hand to my cheek as I began to move my hips. I watched as her face reacted to each slow thrust. Soon her mouth was open, her eyes were closed, and her cheeks were bright red. I lowered my body down and kept up the rhythmic thrusts. Our bodies were pressed together, our sweaty skin sliding across each other as I rocked into her. She wrapped her legs around me, and her arms around my back. She held me close.

We stayed like that for long enough to lose track of time, picking up speed and slowing down at our whims. At some point she pushed my shoulder, a signal for me to move to my back so she could straddle me. She rose and fell on my lap, her small breasts bouncing along with her. We were both so wet, and we'd been making love for so long, that we could hear the slapping of our bodies with each thrust.

She leaned forward, placing her hands on either side of my head. Her face hovered above mine. We locked eyes. We didn't need to say anything.

We came together. She was cumming around me before I began filling her. She collapsed onto me, and I held her, feeling her twitch on top of me, and feeling her heartbeat. We didn't say anything to each other but I knew we were thinking the same thing.

No matter what came next, we had each other.

The rest of the week proceeded as they usually did. Each of us off in our own separate classes and jobs during the days. Back home to eat, study, and generally dick around by night. A few nights that week Emma brought home a guy and put on a show for us. We joined in, in our own way, each time. Sydney had become particularly fond of swallowing my extra large load as Emma screamed out her own orgasm across the wall.

On Friday I had a late night shift that kept me fully occupied, so Emma and Sydney decided they'd head out to the club for some dancing. We were all at home before hand as I got ready for my shift and the girls got dolled up for their night out. They both came out wearing short black dresses, Emma with a deeper plunging neckline that made it impossible not to look at her chest.

She caught me looking and blushed. Then Sydney marched up to me and gave me the fieriest kiss she could muster, as if to say "I'm gonna go to the club but I've only got eyes for you." After she released me I looked up to catch Emma who'd been watching us, blushed even deeper red beneath her tanned skin.

I smiled at them. "You girls have fun. See you very late tonight or tomorrow morning."

They smiled back, said goodbye, and were off. I couldn't help but think what a beautiful pair they made as they left, their blonde and brown hair contrasting as they disappeared into the hall.

My shift passed slowly. Usually the unrelenting rush of a Friday night would keep my mind occupied and make the time move quickly, but tonight I kept losing focus. A glimpse girl in a black top reminded me of the expanse of Emma's back, visible as she and Syd had left. I remembered kneading Sydney's back as she rode me last night, my hands running down to her ass and then her legs. I flashed to Emma's leg, the one that had blocked my view of her pussy as Syd's tongue brought her to orgasm.

The frothy head of the Guinness I'd been pouring flowed over the lip of the glass. "Fuck."

"You okay man?" the bartender to my left asked.

"Yeah. Just distracted."

"Don't let the manager see you like that." He chuckled.

I sighed. "Not gonna happen again."

He just nodded, and we both got back to it. The rest of the night passed without incident, but I still felt it hard not to imagine the two most important women in my life, across town, in small, tight dresses.