Screwed Over By Emily

It's been two weeks now and I'm still trying to wrap my head around what happened and make sense of it all. Things are crazy and I have no idea what I'm going to do next.

At the end of April I received a message on facebook from a friend from high school, I vaguely remembered her as one of those girls that has a lot of people she knows and calls all of them her friend. Anyway let's call her Emily.
She says hi, the usual stuff, we catch up and then she asks me if I'd like to come to a party she's hosting. Here is when I should have known better, but being simple and a little too carious I asked her about it.
I find out It's a swinger get together, just her and a few other girls she has organized together and another set of the men who we won't know and she says won't know us but it'll all be good fun she says.

I got dumped too long ago anyway and I'm looking for some quick fun love so I agree. She says great she'll see me later that week all I have to do is show up at her house.
For the next few days it's all I think about, the idea of having a guy or two to slut it up with keeps playing out in various scenarios over and over in my head. Who will he be, will he be rough or the kind gentle type.
The day arrives, I do my makeup nice, bright red lipstick and all. I'm tall-ish and a little concerned about my height so I forgo the heals and wear some lower pumps and a tight clubbing dress.

When I arrive I see a number of cars parked around the middle class neighborhood street. I'm greeted at the door by Emily. "I love that you dressed up" she says while wearing a T-shirt and shorts. I tell her I didn't know what to expect and she smiles and invites me inside. I follow her through her entry way, past a set of doors, through the kitchen and into a room that looks like a dining room except all the furniture is missing. Instead replaced by a large piece of plywood that walls off the other half from bottom to top.

There are five cutout areas in the wall large enough for a person's rear to be placed against and I guess that's what they are for, each has a number placed above it. Emily gathers us all together and explains that the guys are in the other room being explained the same rules we are about to hear by her boyfriend.
Basically how this is going to go down is we each get a number and place ourselves against the wall. There is to be no talking of any words except for the safe word which is "cancelled". I can get behind that. The rules for the guys is they may play but no anal, seems fair.

The other girls exchange looks but otherwise agree, Emily pulls out her phone and texts her boyfriend that we're ready. Emily is the first to strip down, quickly throwing off her basic clothes to reveal her slender figure and large tits, I admit I'm a bit envious. I follow her lead and so do the other three.
Emily hands each of us a piece of paper which has a number written on it. I can feel my nerves getting to me as I step out of my ring of clothes on the floor and walk to number three. I can feel myself getting wet just at the thought of what is about to happen. The cutout is pretty low to the ground, around kneeling height so I decide that backing into it is the best option. To my surprise I can just fit my rear into it with a little room to spare around the edges, I bend over and wait.

I look over to my left and right to see the other girls looking back and forth between us. We hear the sound of footfalls just beyond and know that the guys must be coming in. A few moments pass and none of us says a word.
I don't know the name of the girl to my right, she's a small thing who just seems to follow the lead. She's bent over exactly how I am and she keeps looking at me as if to compare herself and make sure she is doing everything right.

She squeaks, I look over and like me her whole behind fits easily into the cutout. A pair of muscular hairy hands is grasping at her hips, she twitches and swallows as the man makes approving noises beyond the barrier.
I see he has moved on my feeling her rear and with one hand holding tight to her ass is using the other to finger her in fast motions.
The girl beyond her gasps and I can see her began to rock back and forth. Her man clearly not wanting to wait.

I tremble as I know it's only moments away when my own decides to take action. I close my breath and try to control my breathing.
Then I feel the gentlest touch, it's on my lower back. He slowly brushes across my body messaging his fingers into my spine. Running his hands down and into the crevices of my inner thighs he pulls me backwards towards him and I let him.
I expected him to be like most guys, especially when anonymous but he wants me to have as much pleasure as he does. I feel a tongue against my pussy, hitting just the right spot. He hasn't just found my clit but circled it. Brushing powerful patterns which send my body shaking. I moan and lose whatever holdings I had. I push my body backwards pressing him face first into me.
We stay like this for the next few minutes, I shake as I know that my body is about to release, I'm close to an orgasm like I have never had before.
He senses this and removes himself, I wait a moment wondering if I'm done something wrong.
I am answered at once, a powerful thrust pushes itself deep into my inner workings. Gracefully filling every inch of me. He works with the strokes of an artist as he rocks me hard. I don't even notice the world around me as my eyes have shut and the grunts and squeals around me have been turned out. I am completely focused on this man.

I orgasm hard, clenching around his cock. Not long after I feel him burst into the condom and he withdraws panting hard.

The ding of a bell echos from across the room. It's Emily's phone and she tells us that it's time to rotate places. We do this into everyone has had their fill. None of the men who come after him feel like the first. I thank Emily for the experience when it's over and leave, the whole time thinking about this mystery man. I know I can't ask her who he is.

A few days later after debating rather I should, I go to her facebook to do some snooping and try and figure it out. No luck, she has a million friends many of them guys and it's clear I'm getting nowhere. But then I see a post on her page tagging her. It's from a guy who says "Thanks for the party, had a great time with everyone" and tags her and four other guys, it's from the same night. Apparently they all did what guys do and broke the rules and exchanged phone numbers. I click on his page and see he's part of a public group with the same five guys. Interesting I think to myself and click on the page.

It's full of photos, Emily's boyfriend brought his cellphone and they all took pictures together. I look through the photos and find one posted of hole number three which reads "My first fuck of the night" my heart beats, and is at once crushed.

I see the name of the poster, it's a name I know very well. It's my brother Nathan. My head has been spinning ever since. We were so close growing up, had a lot of the same friends and did the same things, he even dated Emily for a little while in high school. But now, I'm not sure I can face him. I don't know if I should tell him or not.

One thing is for sure, I'm going to kill Emily.