Greg was twenty-five years old when he married Wendy. They had fallen in love quickly, and Greg had enjoyed being a father figure to Wendy's eight-year-old daughter, Serena. Needless to say, Serena was an accidental pregnancy that was a result of one of Wendy's former relationships. Serena's dad had kind of freaked out, dumping Wendy and denying his responsibilities to Serena. Until Greg came along, Wendy had done her best to raise her daughter solo. She had done a wonderful job, but she considered herself lucky to finally find a guy who would join their small family and love both of them dearly.

As Serena grew up she had no problems seeing Greg as her father, even going so far as to start calling him Dad when she was about eleven years old. Throughout her teen years Greg couldn't help but notice how beautiful his stepdaughter was becoming. She never had any shortage of boyfriends, and Greg was quite certain that she had already lost her virginity by age fifteen.

One day, about three months before Serena's nineteenth birthday, Greg had come home from work early due to a power outage at his office. Serena had just finished school for the year, but Greg wasn't sure if she would actually be home. He knew that Wendy, however, Wendy was out of town on business and wouldn’t be home until the following day.

After parking his car in the driveway, he let himself in through the front door of the house. He heard some noise coming from the family room and made his way toward it, thinking that Serena must be home. As he approached, he realized that the sounds he was hearing were the sounds of sex. He stood, just around the corner from the room, and listened for a bit. It sounded a lot like a woman taking a cock deep in her mouth, gagging on it and gasping for air. As he slowly peeked his head around the corner, he saw Serena sitting at the computer, watching a porn video from Greg's collection. As the girl on screen took the cock down her throat, Serena was sitting back in the chair with her pants removed and in a pile beside her. Her legs were spread, and she had pulled her thong to the side. As Greg gazed upon his stepdaughter masturbating to the porn video, he was surprised at the sexual charge it gave him.

"Serena?" he said, finally rounding the corner "Oh my god!" she cried, snapping her legs together and reaching for her pants, pulling them onto her lap to cover herself. "Daddy! What are you doing here?"

"There was a power outage at work, so I came home. What are you doing?" As he spoke, the video still played in the background.

"I'm sorry, Daddy! I was just..." she wasn't sure what else to say.

"Don't apologize," he said. "It's okay. There's nothing wrong with masturbating." She still didn't look up at him and the video continued to play. "That's an interesting choice in videos." She suddenly realized it was still playing and reached for the mouse. "No, leave it," he said. "Have you ever done that with a guy?"

"No," she said. "Not like that."

"So you have sucked a guy's dick before?"

"Yes," she said, embarrassed.

"But you've never let a guy fuck your...