"I want to make sure you are okay before I sleep," my dad insisted, his brow furrowing with that classic fatherly concern that usually made me feel safe. Tonight, however, it made my skin crawl with a mix of terror and illicit thrill.

"But I am okay," I managed to say, forcing a wide, innocent smile at the screen. I adjusted the phone, holding it at an angle that captured only my face and shoulders, praying the camera didn't pick up what was happening between my thighs.

I felt the mattress dip significantly and looked down to see Frank climbing onto the bed. He reached down and gripped my thighs...