I just watched a video of a guy cumming on a pic of my gf [cuck perspective]

My gf had posted a cute pic of me and her on her social and I hadn’t thought much of it. I’ll usually look through the comments and see some funny ones or nice ones from mutual friends. This time was very different because when I got to the bottom I see a random user that obviously likes my gf, he said “wow those are some nice lips, wonder what you could do for me with them” but he posted that as if she was showing off for him, it was weird but I was also getting really hard when I kept reading it.

The next day i still couldn’t forget what that person said, and I started to jerk off a little thinking about it. Yesterday I got a dm from a random user, it looked familiar so I checked and it was the same guy from my gf’s post. I asked what he wanted and he just answered by telling me he wishes he had a girl as hot as mine, the convo was mostly him telling me hot attractive she was and I asked what he really wanted and he sent a video.

It was him with a tablet under him while he held his dick in his hand and smacked it on his screen that had a pic of my gf. I didn’t know how to respond and he sends another but now he was semi humping the screen and positioned his cock right on her tongue. I was so hard and couldn’t believe I was enjoying seeing another guy jerk to my girl. He asked what I thought and told him it was nice. His last video was him cumming on her face(mostly her mouth area) and I was so hard from seeing it I had to jerk off to it. I’ve been thinking about it more and more and the idea of seeing men cum on pics of my gf might be the hottest thing and I feel like I wanna see it happen again.