I was just looking at my girlfriend's smartphone... That's a lie, a lie, right?

My girlfriend is an up-and-coming J-cup gravure idol. I'm her manager. Our relationship should never have happened... but the president of our agency found out about it. Ever since that day, something strange has been happening to her... When Koi was away, I looked at her smartphone, knowing it was wrong. What I saw there was... Koi, at the mercy of that sexually harassing president, shaking her gigantic breasts as she orgasmed wildly. A side of my girlfriend I'd never seen before. Sperm overflowing from her pussy. We've never even had a creampie yet... why... I should be frustrated, but my right hand won't stop stroking. This is the whole story of my girlfriend being cuckolded by a middle-aged man's dick and reduced to a mere slut.