Poly... What? Book 1
Copyright© 2026 by Wolf
Chapter 5: Relativity
Erotica Sex Story: Chapter 5: Relativity - Luke’s marriage and life ignites when wife Ellie proposes open marriage and polyamory. He suspects her interest in coworker Darren, meets his wife Megan, and their adventures in poly soon begin with many surprises as others join in. The growing group likes teasing and making love together in one space. Luke and Ellie navigate awkward situations, emotions, love, and exceptional pleasure. Book 2 already posted at Zbookstore.
Caution: This Erotica Sex Story contains strong sexual content, including Ma/Fa Consensual BiSexual Heterosexual Fiction Humor Sharing Wife Watching Group Sex Polygamy/Polyamory Swinging Anal Sex Cream Pie Double Penetration Exhibitionism Masturbation Oral Sex Sex Toys Voyeurism
Ellie’s scream cut through the room like a siren. “ALLISON! WHAT THE FUCK ARE YOU DOING HERE? DON’T LOOK! DON’T LOOK.” We all scrambled — hands flying to cover cocks, tits, and leaking pussies — while Ally stood there grinning, phone still raised after snapping a few photos. Fuck.
Ally and Greg – Ellie’s sister and brother-in-law – stood a few feet inside the open front door, casual clothes on, looking like they’d just dropped by for a normal visit — except we were all naked, mid-fuck, and the room reeked of sex from our first round. They had a key and standing drop-in rights, so this wasn’t entirely shocking ... until it was.
Ally started chuckling, as she came forward phone in hand. Fuck, she was making a video. She came between both sofas for a better view panning the camera from one sofa to the other to capture all the action.
I’d stopped fucking Megan and stood in shock, my dick becoming more flaccid by the second. Ellie didn’t know what to do, so she just froze in position atop Darren. Initially, she used one arm to cover her tits and the other to shield where her pussy pressed down on Darren’s cock. The pose was ludicrous and even made me laugh. Megan held a small throw pillow in front of her covering one of her generous breasts.
We’d been caught and were responding like naughty teenagers as the parents got home unexpectedly early.
Ally said loudly as she turned to the four of us, “WELL, WELL, WELL. What do we have here? A little wife swapping going on? A little extra-marital romance with friends? How special.” She took a step to where Megan was by then sitting up and blushing the red color of the country’s flag. “Hi, I’m Allison or Ally, Ellie’s sister. That’s Greg, my husband.” She flipped her head in Greg’s direction.
The two shook hands and Megan introduced herself and then pointed out Darren who was still on his back with Ellie sitting up on top of him. Ellie had also blushed to a bright cherry-red.
Greg was laughing. He moved right over to Ellie and boldly kissed her on the lips. “Love your outfit, sister-in-law. You should wear this more when I’m around. It’s my all-time favorite bar none.”
Ellie rolled her eyes. “Can you give us a minute or just leave us alone?”
Ally announced in a positive tone, “Hell no, we’re not leaving. If you’re open to it, we’d like to join in.”
The room went dead silent.
Ally continued, cheeks pink but voice steady. “Greg and I have talked about finding the right people to play with — sexually. We want to fuck around, safely and consensually with people we like. If you’re open to it, we’d love to join you tonight and thereafter.”
The room echoed with silence. Darren and Ellie finally uncoupled and moved to seated positions on their sofa. Darren, like me, had shriveled to a shadow of his former self. Megan chose to stand up beside me and latched onto my arm as she got partially behind me. She had a large breast in front of my arm and one behind it.
I thought Ellie might run for the bathroom or anywhere else other than the embarrassing situation that had blown up in our living room with her sister and brother-in-law. The silence thundered unresolved in everyone’s ears. Darren and Megan looked to us to resolve the situation. I looked to Ellie. This was Her sister.
Greg added in a comforting tone, “Ally and I have talked about something like this for years ... and then we decided to drop by after eating out. We didn’t anticipate anything like this, but ... oh, boy ... I’m sure glad we came here. This is so hot. We’re serious about joining in, although I know your friends don’t know us. Please allow us to join the four of you. We’re friendly, not too kinky, and even loving. We’re more than willing to spend time now or later so everyone gets to know us better.”
I looked at Darren. Despite flushing crimson, he gave me a slight shrug that I took to mean he didn’t care one way or the other. If I was in his shoes, I’d see another hot blonde woman that I could fuck and consider that a huge plus for inviting them to participate.
Ellie still looked shocked and somewhat paralyzed, although she’d stopped trying to hide her feminine body parts. That ship had already sailed. She just stared at her sister but I could see her churning on the decision whether to admit them or not.
Megan broke the tension, still gloriously naked and her color starting to return. “I’m voting yes. This could be a lot of fun. I’ve always wondered what it would feel like to fuck someone brand new that I just met for the first time.” She turned to Ellie and asked, “Have you ever fooled around with them?”
Ellie slowly shook her head and got an enigmatic smile, “No, but that doesn’t mean I haven’t thought about Greg more than once.” He perked up at her statement. I wasn’t surprised. More than once I’d fantasized about fucking my wife’s younger sister.
I pushed my wife. By my tone, she probably knew I was hopeful that something would happen. “So, you wouldn’t mind them participating in our open marriage? They’d have full privileges, you know.” I wanted her to think about me fucking her sister, something that I’d also thought about – a lot, actually.
Ally was very appealing: only eighteen months younger than Ellie, similar looks, short hair, blonde, jiggly breasts, sexy hips and ass, and nice legs. She kept in shape, too. We knew her well and liked her. She was confident enough that I was sure she spoke with sincerity about her desires.
Ellie remained mute. I overwrote the silence, “Well, my vote is yes, too. I think they should participate. Darren?”
Darren speculated and sounded eager at the same time. “I think it’d be more fun for all of us. Six instead of four. We can trade around more. We never set a limit on how open our open marriage would be. This would be great.” He nodded for his vote.
We all looked at Ellie. She finally said, “Okay ... fuck it. We’re already way ahead of you. Get naked. Pick a new partner and let’s see what happens ... just nobody get their nose out of joint if this turns south.”
Ellie’s remarks were almost like dropping the green flag in a drag race, everybody’s engines started revving at high speed and there was a squeal of tires. In this case, the squeal of joy came from Ally. Greg and Ally’s clothes were flying seconds later as they raced to get as naked as the rest of us were.
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