Surprise pic

I had been dating a hot 21-year old for a while. Tall, natural blond, blue eyes, pale skin. She fucked me over and we split, so I hooked up with her best friend just to piss her off.
Her bestie and I ended up staying together for a while. One day she was using my PC and clicked on a file in a random folder. I watched in horror as a pic of my ex appeared, fullscreen mode. She had on a red lacy bra, pulled below her perky tits. She was naked from the waist down, her legs as far apart as she could get them, bald pussy parted. Her bright pink pussy lips really stood out against her creamy thighs.
It was really funny how the first thing that caught my and my gf's eyes immediately was that pussy. You couldn't look away.
I stammered an apology, she was somewhat annoyed. I wish I still had that pic.