When I first met my wife and we were dating she would do some modeling. She did nude modeling not necessarily porn, but nude sexy modeling. She works with a photographer for a few times who would do bondage. He would tie her up naked in a bunch of different positions using those Japanese ropes. She's always had a great body and made really good money when we were first starting out dating. I went to a lot of these shoots.
The second time she worked with this one particular photographer once they got started, she'd be bound up tied into positions and he'd take photos. Then untie and move to another position and different ropes. Nothing super restrictive just more sexy than anything else.  After a few weeks or months with these photographers they'd send a copy of the photos digitally.  I just found out 10 years later, looking through a DVD of some old photos, that I never went through, that I could see her pussy getting super wet in one of the series. I have a photo of him zooming in on it, as it dripped to her thigh. Then he obviously said something because the next few pics, she's laughing. Then kneeling, then he's resting his cock, pulled from is jeans on her face. The next photo is her bent over the bed, soaked, he's close, hard AF, and the final pic she's reaching back between her legs aiming him in. Time stamps show 11 minutes later and she's tied up on the bed posing again, but her pussy is a wreck. She's obviously been fucked. Apparently right after sucking him. 
I was literally in the next room. She never told me and we have a great marriage. No cheating or any real issues at all. Until I discovered this. Do I tell her? Do I leave her? She sucked a dick and got fucked, with me 50 feet away, but we were only dating not married yet.
What do I do? I've attached a photo but removed her face.

When i was 18 i fucked my ex sister in law. To this day ive never told anyone so heres my almost incest confession....

she was 30 at the time and had been my sis in law since i was 6 she had always been a big sis to me. Im gonna leave some specific details out just in case for obvious reasons but ill try to be as detailed as i can. i hope you enjoy i still get off to the memories all these years later.

I was living with my brother and her at the time that he left her. it was out of the blue and they had kids together. I was angry at him over it and she told me i didnt need to go anywhere so i stayed there with her and the kids. Time was moving on we used to smoke weed and take mdma together as we always had done pre break up at the weekends. i dont know if one of her friends suggested i might be interested in her (i wasnt) but we had the chat and she pointed out nothing could ever happen with us. I laughed and told her she was my big sister not to be crazy , i was there to help with the kids which was true. no more was said about it but i guess that planted the seed.

I was a horny inexperienced teen , i think id fucked about 6 girls at that point. She started leaving her dirty panties on the bathroom floor she was never tidy so never thought anything of it but in hindsight couldve been deliberate i dont know. I do know i started sniffing them and jacking off . sometimes id put them on too or cum in them then throw them in the wash basket.

We had a family party for one of the kids and my bro was there. she had it in her head that this was when theyd get back together but i knew he was seeing someone . it was very late when everyone including him left. when she closed the door and locked it she just burst into tears. we were drinking and super high. i hugged her and started consoling her innocently , when she composed herself she said she'd needed a good hug for months i said you can have all the hugs you want tonight and rolled a joint. We took more mdma and sat on the couch with me hugging her somehow we ended up sitting on the floor with our backs to the couch me still with my left arm around her. This turned to us lying on the floor legs locked together if you can imagine .

My thigh was between her legs and we were kinda looking over each others shoulders. i started moving my leg up and down her pussy a little rubbing it with my thigh. i knew i was crossing a line but i was super high and could blame it on that. She didnt stop me! Now i was mega horny and picked it up a little . This went on for about 5 mins and i decided to take the chance . she was looking away from me so i said her name and reached to touch her cheek to turn her head towards me. she just grabbed me and we started making out. i was grabbing her amazing ass and rubbing her pussy with my leg. this went on for a few mins before she came to her senses and stopped. she said we cant do this, your like my little brother and got up and sat on the couch. I followed her up there , leaned forwards, kissed her again and put my hand down her top to squeeze her tit. she let me and then pushed me away . she said I need to be responsible here before this goes too far with a big smile on her face. she said im going to bed. the next morning i went into her room and asked if we were ok. i told her id move back to my folks place if she wanted . she looked up at me , stroked my arm and told me not to be silly. we didnt fuck that time but that was to follow a week or so later. this lead to us carrying on in secret for months. if theres interest here ill carry on . theres enough detail her already that she would 100% know this is about her.