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.
Tiffany resumed gyrating her hips, but slowly. "That's what I was hoping for," she said. "Well, part of it, anyway."
Scott took his right hand off her butt and put it under the front of her shirt. He moved it up and confirmed that she wasn't wearing a bra. "Like this?" he asked.
His hand felt so natural on her breast. "More like this," Tiffany answered, and she moved his hand a little so his palm was over her erect nipple.
"And maybe this?" Scott took his left hand off her butt and moved it to the front as well. Her left nipple tingled in anticipation, but instead, he put it over her pussy and began stroking it.
As he was moving her hand, she knew she was going to have to make a decision, but when she felt his fingertips sift through her pubic hair, there was no more question what she wanted. "Yeah, like that," she cooed. He inserted a finger and tried to finger-fuck her. She felt his jeans against her ass, and she could tell there was a bulge. "You seem a little uncomfortable," she said.
"Yeah, I am," Scott admitted. He removed his hands. Tiffany turned around, but he asked, "Did I say to stop? I haven't seen anything like this all semester."
She turned back to face the mirror and kept moving her hips. She could see him unbuckling his pants. She was concentrating on her own moves when she heard them fall to the floor. He came up behind her, and she could feel his hardness through his underwear against her butt. This time instead of playing with her tits, he stroked her pussy with his left hand and her clit with the right. "Oh, God ... Oh, God," she moaned. She got up on the balls of her feet so he could get more of his erection between her legs. They ground their hips together, both knowing what they ultimately wanted, but neither willing to be the one to break the tension they were already enjoying.
Finally, the song ended. Tiffany had to step forward to choose another clip. When she moved back, Scott pointed his dick between her ass cheeks. She raised her feet again to let him through, and this time the head slipped through the opening in his underwear. She spread her thighs a little. As soon as he moved forward, she closed her thighs again. They continued bumping and grinding, enjoying just that moment, for the next couple minutes. Then the woman in the video gave Tiffany an instruction to pull her hips forward as far as she could. When she did, Scott's dick came out, but when the instruction came to grind back, his dick went all the way through her thighs. She had one more chance to change her mind. Maybe he was thinking the same thing. I'll let him decide, the thought. If he develops a conscience, we'll never speak of it again. If not, I'll have something to talk about in the anonymous forums. She bent down to where her chest was almost horizontal, and she saw his dick for the first time. Did she say, "Wow," or did she only think it? It was the thickest she'd ever seen. Brother or not, she had to find out how it felt inside her.
Scott pulled back and went forward, and buried his dick in her pussy. "Is this the reaction you were hoping for?" he asked.
"Not from you," she said, "but yes."
"Sorry," he said, and he started to pull out.
It was one thing when she wasn't sure what she wanted, but to have the choice taken away from her was unacceptable! She closed her thighs. "I didn't, but I do now!" She ground her hips left and right, and Scott thrust back and forth. Between the two of them, his cock was touching places that none of her previous dates had ever reached.
"You like twerking, huh? You like how it gets me all hard?"
