My gf Tina (25) and I (28) have been together for a few years. I find her very sexy and I know other men do too judging by the lusting looks she gets each time we go out.

She has a normal 9 to 5 job but she also does some part time modeling. Like she's not a famous model or anything but she has a little over 10K followers on IG. Some of her pics are what one might describe as provocative. I personally love them and since I travel for work every now and then, I've masturbated to some of her IG pics that I particularly like. She knows about this and finds it hot too. She likes the fact that I get turned on by her even when we're far away. Otherwise, when I'm not away I rarely if ever jerk off. We have a pretty busy sex life.

She has worked with a few photographers so far, both male and female and I've never felt any jealousy since I've felt a very professional and non sexual vibe comming off from all of them, even from the men, even though as I said earlier some of her pics are quite sexy. This all changed last Saturday.

She was contacted a week or so prior to that by a male photographer she had never shot with before. Let's call him Jim. He's in his mid 30s and he's a fit, good-looking guy. He offered her a collab. She showed me the DM and it was quite normal, just like others she had previously received. We checked out his profile and he had some really good shoots of pretty girls wearing sexy lingerie and/or hosiery. He told her he was hired by a local pantyhose brand to do a photoshoot with some of their new products and he was willing to give her a percentage of what they paid him. He also said that he thought she had nice legs and the tights would look good on her and that he wanted to work with someone he hadn't worked with before. She has shot for another brand that sells stockings before and that's how he found her profile.

She asked me if I was ok with it, since we didn't know the guy. I actually took a few hours to think about it, since I felt a slightly different vibe from him than normal. In the end I agreed. I knew how much she liked her part-time job and above all, I trusted her. Also, looking at the other pics on Jim's profile, I knew I was gonna get some new sexy pics of my girl to enjoy.

On Saturday, around noon, I gave her a lift to his studio. On the way there I had some second thoughts about all of this, but in the end I decided not to overthink it. I dropped her off and I headed to my studio which was a 15 minute drive away (I'm a composer and music producer and I had a few things to wrap up). When I got there, I saw a text from her that it would take more than just a couple of hours as she had initially thought, since the guy wanted her to try on quite a lot of different products. I said ok and told her to give me a call when she's ready for me to come pick her up. I honestly didn't give it much thought at that moment, as I was already in a working mood.

Her best friend, Ashley, was supposed to come to our place around 8 for a movie night. I was doing some deep work, so I lost track of time. At one point I looked at my phone and saw it was already 7 and Tina still hadn't called. I called her immediately. She responded quickly and she told me she was just about to call me. She had called Ashley to let her know we were gonna be late. Ashley was gonna come at 9:30 instead of 8. Tina also told me they were just about to try a few more shots but they were almost done and I could get going. She also said they were gonna buzz me in if they're not finished by the time I get there. I was there 20 minutes later and got buzzed in, since she was changing.

I entered the studio and actually met Jim. He looked pretty chill. I noticed the lights were dimmed and the whole vibe was quite sexy. I knew the pics were gonna be good. I also saw lots of pairs of nylons on the couch. I asked if she tried all of them for him today. He confirmed. Tina was just putting her shoes on as Jim and I made small talk. She came and gave me a quick kiss. She said she just needed to go to the bathroom real quick and we could be on our way.

While she was there, Jim told me that she was allowed to keep all the pairs of pantyhose she had shot with that day. He said it would take a lot of time to put them back in their proper packaging and offered a paper bag. He grabbed all of them and stuffed them inside. There was something erotic, at least in my mind, about him touching the hosiery my gf had worn earlier that day. He then walked over to me and handed me the bag. He smiled and said "It's been a very long time since I've had to work with such a long lasting hard-on. Your girlfriend is very sexy." I felt shivers down my spine and butterflies in my stomach. I tried to laugh it off saying "Haha we looked at your profile and there are some other hot girls you've worked with." He replied "True, most of them I find quite hot, but today, Tina gave me a boner for the whole business day" and the he chuckled. He looked me in the eye saying that and he seemed really confident. I said "Thanks... I guess". He said "You're a lucky man". He had a look in his eyes that was saying he wanted to fuck her brains out.

Inside I was kinda shaking, but I managed to hide it and didn't say anything. Tina got out of the bathroom. They gave each other a kiss on the cheek and they both acknowledged it had been a pleasure to work with each other.

We got in my car and we were on our way. I wasn't very talkative during the drive but I decided I'd ask a few questions and make a few comments as to not appear jealous. She was still wearing the last pair of pantyhose they had shot with and I told her her legs looked hot in them. She looked at me with her kinky eyes and told me I could rip them when we get home if I wanted to. I liked the idea. However, I couldn't get what Jim said earlier out of my head. I imagined him making similar comments in front of her while I wasn't there and low key hitting on her. It made me jealous, but at the same time it made a little bit of blood rush towards my dick and gave me a semi hardon. I also had the image of him grabbing the pantyhose she had worn with his hand in my head which gave me a slight turnon as well.

We were talking about how it had been working with him and what movie we could watch when Ashley arrives later. I parked the car in front of my place and while we were still inside she said to me:

- Babe I gotta tell you something.

My hear stopped, I knew something was up. I didn't actually think something happened between them, but I was sure she was gonna tell me something I wouldn't like.

-... what?

- While we were shooting... some of the pairs of nylons... I wore no panties underneath. Not all of them, not even most of them, maybe about half of them.

I fell silent. Not only did this guy have the balls to make a comment about how hot she is in front of me, he had also seen her pussy through the pantyhose. There was a whole new demention now in my mind to the earlier episode of him grabbing all the pairs and putting them in the paper bag. These nylons hadn't only touched her legs, ass and feet, they had also touched her pussy. And I looked at it as him touching it too. She was quite nervous after telling me that and continued:

- Obviously my private parts are not gonna be visible on the pics...

- But he saw it?

- Saw what?

- Your pussy.

She blused and nodded. I was shocked by two things. The first thing was that things had gotten further than she had ever gotten with any other photographer before. The second thing was that, as jealous as I was was, I was also turned on beyond comprehension. I looked at her and said:

- Are you wearing panties right now? Under your pantyhose?

- No.

- Let's go upstairs before Ashley gets here.

We entered the apartment, I ripped her clothes off and we started making out passionately. She had nothing but her pantyhose on. I ripped them and slid my hard cock inside her. I started fucking her as hard as I could and she soon started creaming on my dick. "You're such a sexy slut" I said as I grabbed her neck "showing your pussy to other men..." She moaned loudly and said "I'm your slut baby... all yours... fuck me harder..." I started truly giving it my all and a minute later she had an orgasm. I continued pounding her and the image of him grabbing the nylons from the couch from earlier reappeared in my head. In the heat of the moment, my imagination quickly made it grow in to the image of him rubbing her pussy through the nylons. The second this image came to be in my mind, I felt a huge load leave my balls and enter Tina's pussy. For some reason, the thought of him touching her pussy was the trigger for me to cum. Both of us moaned loudly. I kissed her gently and told her I loved her. She said she loved me too and added "I'll be your slut any time if you fuck me like that."

As we were cleaning ourselves up, waiting for Ashley to come over, I asked her if Jim had made some kind of move on her. She swore he hadn't and I believe her. I felt relieved, but at the same time a tiny bit disappointed.

Ashley came about 10 minutes later and we sat down and started watching a movie. I don't remember the movie name, but there was a scene where a male photographer was taking pics of a semi nude female model. That triggered my thoughts about what had happened earlier and I got hard again. I couldn't stop thinking about how my beautiful girlfriend was posing for Jim in nylons without panties underneath. How hard he got and how he wanted to fuck her and how he had the balls to tell me she made him hard. My mind started going down this rabbit hole and I started picturing the two of them turning the photoshoot into something more. It's funny what your mind does when you're horny. I started picturing various scenarios where they would have sex after the photoshoot just before I came to pick her up. I pictured him cumming on various spots all over her body and I was hard an horny af.

I told the girls I was really tired and I wanted to go to bed halfway through the movie. I said I was gonna take a shower and then ho straight to bed. The truth is, I wasn't tired at all. I was turned on like never before. As I said in the beggining of the story, I rarely if ever jerk off while we're not apart. The second I got in the shower, I grabbed my cock and started masturbating thinking about Jim fucking my girlfriend. I was picturing her moaning and enjoying his cock, maybe even giving me kinky stares as she rides him. I shot a huge load under the shower, bigger than I expected since I had already emptied my balls earlier.

After the shower I went back to the living room where the girls were still watching the movie. I told them the shower had freshened me up and I was so sleepy anymore, so I rejoined them. After the movie we had a couple of drinks each and Ashley was on her way. I then led Tina to the bedroom where we had sex one more time. I was still very horny, but it was slower and more gentle this time. At one point as she was on top of me I told her:

- You know... Jim told me he had a hardon the whole time while he was taking pics today.

- He did?

She started riding me more intensely after that and moaning more. Obviously that turned her on. A few minutes later, I gave her another creampie and the we cuddled and fell asleep.

I'll say this one more time, because I can't stress this enough. I rarely if ever jerk off. However, as I said, I masturbated once on Saturday night in between two times having sex with Tina. I also did twice yesterday and once today. Each time I was picturing the two of them having sex in various ways.

I may be becoming a cuckold.