Just recently I had let my gf use my phone so she could log into one of her social media accounts. She had left her phone at home and we were out of town so there was no way of turning back just to go back for her phone. After letting her use it she gave it back to me and I had forgotten about it for a few days. It was until I had clicked on the app that I realized I wasn’t in my account but instead I opened up her account. I wasn’t trying to be nosy, but I scrolled down her messages. Seeing family members and then some random strangers. After scrolling down further I came upon a few guys she had seemed to be talking with. Clicked on one of the chats, w nothing but small talk. Then on another, and another. I was about to just leave it at that but I clicked on another message. Out came a pic of something I didn’t expect. A picture of a pretty nice cock. His I assumed. At first I didn’t know what to do, but I scrolled through it and I got to see more. More pictures of his cock and then, pictures of my gf. She had sent him pictures of her tits, her ass and her pussy. Of course he had asked for them and seeing he sent her some of himself she returned the favor. While scrolling through the chats I didn’t even notice that I was getting aroused. My cock was rock hard when I finally noticed as I sat there. Knowing that she was talking to other guys and being a slut had me going. I had no idea she was like this and she played it off very well saying that she had no interest in leading other guys on. I ended up looking further and ended up going through more and more pictures that they had sent eachother. They had seemed to be talking for a few months. I then wondered if perhaps they had ever met up to fuck. Maybe even just for a quickie. Or what about the nights that she said she had to work late. What if they did something then. I wasn’t even mad I was so turned on by the thought. It made me so horny. I ended up pulling out my cock right then and there as I sat on the couch and I started stroking my hard cock. I scrolled through and came back to a picture of his hard cock, looking like he was just as hard as I was If not harder. I imagined her having her lips wrapped around his cock, sucking him just like how she would suck me. Seeing her flick her tongue, licking the tip of his cock just like how she did me. I bet she would love sucking his cock too. I started stroking my cock faster thinking about it. Stopping to catch my breath. I then imagined her jumping on his cock, sliding it into her tight wet pussy, seeing her bounce on it up and down with her ass. Moaning as she took his hard cock in her pussy, creaming all over it as she rode him. Imagining his hands grabbing her ass cheeks, spreading them and slapping them, spreading them far apart and allowing me to see her tight little ass hole while he fucked her. I could see myself just standing there and watching him use her like the slut that she was. Fuck I was so horny. My cock was leaking with precum and I continued stroking, thinking about her fucking another man’s cock. Seeing her kiss him, going crazy for his cock while he sucked on her tits. I couldn’t take it anymore as it was too much to think about. I was about to cum as I stroked my cock , she looked way too good fucking his cock. With a few quick strokes, I held onto my cock, shooting cum all over myself as I sat there, cock throbbing and balls twitching. Letting out a loud moan as I watched my cock cum. Holding onto my cock I let out a deep sigh as I went ahead and shut off my phone and got up to go clean myself. I debated if I should bring it up. I thought about signing out of her account and going back on mine and just forgetting about it. I even thought about messaging the guy back just to see how far he’d go with her. After some thought, I figured i’d just leave it how it was. Like I said, I wasn’t mad or anything, and if they were to do anything, at least I’d know about it while it was going on. At the end of the day, I’m still fucking my gf’s pussy and loving it.