The parents return earlier than expected

Before I had the chance to respond, we heard a loud knock on the door. Startled, the twins and I quickly looked at each other and it dawned on all of us that their parents had decided to come home early from their trip.

My heart skipped a beat as my mind raced with dread. What would happen if they found me like this? Yes they'd seen me naked and in compromised states before, but I hadn't been caught by them flicking the bean for the amusement of their daughters before; there was a difference between someone comfortable in their own skin and someone acting like a common tart.

"Girls, we're home!" I heard the father, Martin, call out, they're certainly earlier than expected, and we weren't expecting them for a while, certainly way later than while I was naked and fingering myself.