Because they guy asked me to cum to his girlfriend's picture which was in a hot pose, but it was my first time doing something like that, and on top of being someone's girlfriend already, I was working with 2 static pictures, and my body was just not co-operating that day.
I did uh...help myself to other content to help the process along. Eventually got myself to the edge, and just, the cum was all over, and I was afraid I ruined the phone. I didn't expect to cum so much! They were shocked.
Oh I forgot to mention, I was also awkwardly using my Laptop camera, while also staying relatively quiet. (It was the night, and I do still live with my parents).
The couple's reaction was worth it though!