It was early April. Classes were cancelled on Wednesday for a faculty development day. Scott didn't have any classes on Tuesday, and the college was only an hour away from home, so he took advantage of the manufactured weekend and went home Monday evening. When he got there, only one car was in the driveway. He went in and heard some deep bass reverberating through the house. He followed the sound until he got to his sister Tiffany's bedroom door. She was a senior in high school. She was facing her mirror and dancing. Scott had come from a direction that put him behind her. Her T-shirt barely covered her ass. At one point in the music, she leaned forward, and he could see the lower part of her buttocks. On the next beat, she moved forward again, and the top went up further. She shook her ass so hard that he couldn't tell whether she had anything covering it. Scott had never thought of his sister sexually, but he couldn't help himself from complimenting her. "Nice!" he said.
Tiffany stopped and turned around. "Would it kill you to announce yourself?" she asked.
Scott put his arms around her and hugged her. "Nice to see you, too," he said sarcastically. The music ended, and he noticed that she'd been watching a video on her laptop. It was a present from their grandparents for her eighteenth birthday.
"What's up?" she asked.
"My schedule gives me two days off in a row, so I thought I'd come home to my beautiful family." As he said this, he let his guard down. Tiffany hugged him back, and in the effort, brought her shirt up. Scott's hands were now directly on her ass. "My really beautiful family," he added with a smile. Tiffany stopped hugging him and stepped back. "So, what are you doing?"
"Mom and Dad had theatre tickets, so I'm taking the opportunity to teach myself how to twerk."
"Looks like you're a fast learner. But why?"
"I'm hoping to get Jimmy to make a move on me."
"What move? You've been dating him for two months."
Tiffany put her hands on her hips and rubbed up and down. "I mean, a move."
"An ass like yours, and he hasn't made a move? What's wrong with him?"
"Glad you noticed," Tiffany said.
Scott sat in the chair at her desk and told her, "Show me what you've learned."
Tiffany clicked on another video. She followed the woman's moves, starting by shaking her chest. Scott was well placed, since the whole thing was viewed from behind. Tiffany's boobs swayed far enough on both sides to keep Scott's interest. On the next move, she leaned her chest forward, then pushed her stomach forward and then shook her ass.
"How long have you been practicing?" Scott asked.
"Since yesterday," Tiffany answered.
"That's amazing! It only took you a day to be able to make each cheek move up without using your hands!"
"Artistry is great, but that's not really what I'm aiming for. I want a reaction!" She turned around and saw Scott rubbing his crotch. Scott immediately moved his hands away, but Tiffany said, "No, that's good. At least I know I'm doing it right."
"Don't let me stop you," he told her. Even when he had his hands on her ass, he couldn't tell if she was wearing anything besides the T-shirt.
Tiffany backed the video up a couple times until she found a good spot to resume her workout. This time, when she got to the ass-shaking, she bent over so far that Scott had his answer. "Hell, yeah!" he told her.
"You like it?" she asked. She could see him in the mirror approaching her, and she did nothing to stop him, not even when she felt his fingers between her thighs.
"Do I ever!" he said.
Tiffany locked her legs for a moment, trapping his hand. She had to make a decision. She'd always been taught that this was abuse, but it sure felt okay to her. She loosened up to see what he'd do. He didn't move back, as if he were embarrassed, or forward, as if he were eager. She took a step backward. He pulled his hand back, but he put both hands on her butt. "What does it make you want to do?" she asked.
"Right now, just this," he answered, and he caressed each cheek.
