Knock, knock. My heart jumps as I quickly whip my boxer shorts up and pull the sheet over me. I panic at how little any of it does to hide the massive boner I was just polishing off for my pre-sleep wank. I grab a pillow and place it over my lap. “Come in,” I call. The door creaks open. Estelle stands silhouetted by the hallway light, dressed far too skimpily for a sleepover at her best friend’s house. She’s wearing the t...