Author's Note: While this is not an incest story, there is an element of incest within it; so if that bothers you, you may want to choose another story.
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"Blake, don't forget to act surprised tomorrow, okay?" Tracy was standing at the threshold of her bedroom as she spoke in a hushed voice. "Mom and Dad thought they were being all sneaky, but they don't seem to realize we're not seven years-old anymore."
"I know," Blake replied, leaning against the door jam of his sister's bedroom, "They do know we follow them on Facebook, right?"
Blake's parents were planning a surprise 18th birthday party for him and tomorrow was the big day.
"I have to say," he said, "I'm more looking forward to my 21st birthday, but who's counting. Good night."
"Good night."
Wow; 18 years-old, he thought. Blake Wilson looked into the bathroom mirror and smirked. How he'd changed over the last couple of years. At 16, he was 5-8 and a 155 pounds - athletic, but nothing like the person staring back at him in the mirror. Blake was built like a linebacker, standing over six feet and weighing 220 pounds. The thing was, he had no idea how he got his chiseled physique. While he played sports, he never really lifted weights. Over the last year, he had simply gone through a second growth spurt that turned him into the specimen he was today. He wasn't going to complain.
His extraordinary muscle tone was matched by his beautiful, mahogany skin, the result of the biological parents he never knew. The Wilsons adopted him when he was just a few weeks old and had always treated him like their own despite the obvious difference in skin color. He once asked his dad why they decided to adopt a child of a different race.
"We didn't think of it like that," he told him. "We picked the cutest baby with the cleanest bill of health." He paused for a moment then continued, "We were told that your biological parents were a mixed couple so we saw some poetry in that. Otherwise, we just thought you were a cute kid."
Their "cute kid" had grown into a behemoth of a young man who had caught the eye of more than one of his female classmates. Blake however, while going out on plenty of dates, was one of the few guys in his circle of friends that was still a virgin. He couldn't quite explain why - he wasn't consciously deciding to remain a virgin - when it came down to it, he just didn't have the desire to have sex.
However, just a week ago, things started to change. The first clue that something was happening to him occured exactly one week before his birthday. He woke up and walked to the bathroom like every morning. As often happened, he passed his sister in the hallway as she was usually up first. They grunted their "good mornings" as usual, still in the stupor of sleep. But this time, as Blake passed by his step-sister, he caught the scent of something he hadn't noticed before. It was faint but intoxicating, and it was emanating from his sister.
As they passed each other, something (that scent?) made him turn back. He couldn't help himself as his eyes drifted down her back to her round, bubble butt, which was barely contained by her pajama shorts. He took another whiff of the faint scent and his heart began to race in his chest. Before Tracy could notice, Blake ducked into the bathroom and closed the door. Splashing cold water on his face, he looked into the mirror. There was something there - just for a second - that was different about his eyes. He couldn't place it, but he shook off the incident with his sister and got ready for school.
He next noticed something off when he saw Megan, the girl whose locker was next to his. She was petite, wore glasses, and was a little bit of a nerd. But she was sweet and tutored in math and science. She even recently helped Blake prepare for a physics test.