My partner, a sexy bbw redhead in her 30s, and I, the same age with a dad bod, had a good run. Children, a decent house, etc., a decade of fun. We started off as swingers, but both had wildly different views on who we found attractive, so we decided to just open the marriage up and do our own thing. Despite the relationship slowly coming apart, neither of us blamed being open on our marriage ending, but that's a different story for a different subreddit.

This past winter we decided to fully separate, but still live in the same house so we could coparent the kids together. We both get along great as friends, so the kids don't see constant yelling and arguing, and it saves us a ton of money.

A few months later, she had her FWB over. I politely asked if I could watch (she said no), and then told her to have fun. Her bedroom is right next to the main bathroom. I didn't sit outside her door listening, felt like that would have been an invasion of privacy, but the door is a bit on the thin side. So when I went to go use the bathroom, I could hear the two of them going at it.

"Oh fuck, oh, oh oh, goddamnit fuck!" I heard her yelling as the "thwap thwap thwap" rhythmic sounds filled the air. After coming out of the bathroom, I heard them kissing and her murmuring, "oh my god." 'Fuck, I remember when I could do that to her' I thought to myself, a little sad, but not sad enough to change the status quo.

Needless to say, I went back to the room and gave myself the best masturbation I've had in ages. I was genuinely happy she had a good time, which she did. She knows how much I enjoy hearing details from her sexcapades and still gives me a few, though not as much as she used to (In this case, he tongue fucked her harder than he usually does).

A few months later, her "throuple" came to stay with us for a few weeks. A pleasant enough man and woman (both in good shape and asses to die for) that I get along great with but never spend any time with. Leading up to our anniversary, my ex and I talked about the state of our relationship. She hinted that maybe in the future we could have a physical relationship again, to which I respond, "That'd be great, but please don't think that if we did anything like that, you'd have to worry about me falling in love with you or anything like that. I've finally moved on." She was so relieved to hear that, and thanked me for listening and being a good partner even though things have changed.

The day before our 11th wedding anniversary, I asked if she wanted to do anything. I'll admit, the conversation from a few days ago gave me hope. Not hope that the marriage would be restored, but hope that we could have fun together on an outing like we used to. And hope that I'd get laid honestly.

"No, not really," She said. I will admit, I walked away rather dejected.

I had to work that day, so it mostly felt like a regular day. My partner stayed the night with her throuple in their RV, and I went out to go drinking, and hoping maybe I could get a guy or girl's number (no such luck but the alcohol was good, so good evening overall).

In the kitchen the next morning, she asked me how my night went. Told her it was good, that I went and had a few good drinks.

"Oh I'm so glad you had a good time, I was worried with it being our anniversary, you wouldn't have fun."

"Did you have a good time?

"I got absolutely railed last night, " she chuckled. "He finally took my ass last night."

Damn. I'd never gotten to fuck her in the ass. My cock, while not the biggest or longest, is quite thick, and my partner (not the first male or female partner to say it either) said it would have been uncomfortable.

"Can I ask how it happened?

She said that they'd been drinking, and when he gets buzzed, he enjoys anal play.

"He put me on my back, and started rimming me to get me ready. His wife was kissing my tits, and then he started lubing up my asshole, and just slid it in."

"Did it hurt?"

"No, that was the surprising part. He's just as thick as you, and it felt so good. Once he came, she started licking my pussy until I came again."

In an alternate world, we would have been celebrating 11 years of wedded bliss, sensually making love and giving ourselves to each other completely. Instead, I drank alone while my former bride gave her anal virginity to another.

Part of me was a little hurt, the other part of me was insanely turned on.

The hurt has passed, as I knew it would. I have a date this weekend. And a memory to last me a lifetime.