Curious how “hot” my girl is…

My girlfriend and I have been together for 6 years. We have a great sex life, and started getting more adventurous. Started with toys and talking dirty, to flashing in public, then to daring her to answer the door naked. It was hot af. Then started fucking on hotel balconies, and kept progressing. What finally took it further, was after I came in her mouth, she grabbed and kissed me. That led to fantasy talks about imagining kissing her after she sucked another guys dick… after a few weeks, I started bringing up names of our co workers, friends etc. one day at work, she sent me a nude, and I told her I was going to show a buddy of mine. She went radio silent for 10 minutes, and I thought she was pissed. Then she sent me a vid of her in bed, and said here’s another for him to see! Then started saying I wouldn’t, I was scared, and that I would go crazy knowing a guy I work with seen her. Finally, I told her to send another, as I was going to show him some YouTube video, and I was gonna let it pop up while he had my phone. Well she did, and I watched as he opened the text. I acted like I diddnt know, then went to grab my phone. He switched screens back, but I checked and it was still open. This was the start of sharing my gf! More to come

the vid he seen

one of these got fucked by a big cock in the ass.
which one is the girl getting fucked in the pic included in the comments?
left or right?

I just came back from a conference - my first since the pandemic - and it was in a high end hotel. The second morning of the event, while I was getting ready, I heard something that initially didn't pay much attention to, then I realized that I think it was someone having sex in the room next to me.

I put my ear to the wall and it was definitely a woman moaning but I couldn't hear much else. I decided to try putting a glass up to the wall and my ear against the glass... and holy fuck did that work. I could hear her every word as her pussy was being devoured by some guy. She'd give some direction but as things escalated she'd only get part of a phrase out before moaning.

I got so hard so I took my pants off and started stroking my cock. I ran over to the bathroom and grabbed some lube I bring with me (for obvious reasons) and by the time I got back she was full on panting and I could hear he moved from eating her to fingering her. She wasn't quite there yet to cum but started begging him to get inside of her.

He does and lasts like 30 seconds. He was grunting and grunting and clearly came while you could hear her moans turn to disappointment as she was very close to orgasm and he blew it. I was disappointed I missed out on hearing her scream even more than she had been.

She shifted gears and said to him 'let me taste that cock' and it was clear she was sucking his cock. He sounded surprised a woman would put a cock full of pussy and cum in her mouth because he said things like 'oh shit that's hot' and 'clean me up baby.' That's when I started to cum myself. I was afraid they'd hear me but I think it was fine - they weren't holding a glass up to the wall, stroking cock... Then things got quiet.

They were getting their clothes on and then it became clear she is cheating on her husband with this guy because she mentioned him as "my husband" and that she hasn't had sex in a long time.

They were clearly going to exit their room in a minute so I threw my clothes on and waited until I could hear their them leave their room, then I quickly left mind - I had to see who was fucking.

I only saw them from behind but she was in tight yoga pants with a fucking hot ass. He seemed like average joe... then I realized they were attendees of the event I was at (I was a speaker). I turned around and got back to my room before they saw me. Then I stroked off again because I remember everything about her from the day before.

Later at one of the social gatherings I saw her and chatted a bit. Of course she had no idea I was stroking off to her while she was getting fucked. We talked business, exchanged business cards, and I said I'd reach out to her... that night I googled the shit of of her, found business videos and her LinkedIn and have cum several more times recalling her moaning...