Derek grinned at the sight of her sister going crazy over what he was doing. He had not idea what came over him or how he managed to do everything so well but he hoped it wasn't just his imagination. Her moans and groans only made him finger her tight pussy even more harder and faster. What happened next was something he always thought was fake. His sister started to squirt until the air like a fountain. His finger instantly stopped but it was like watching a fountain in the park, it seemed like it was never going to end. Of course, it turned him on knowing he was pleasing her so well.<br/><br/>When Stephanie demanded for him to get inside her, his eyes opened wide and he looked at her with a scared look. He couldn't disobey his sister when she was being so nice to teach him all of this stuff so he figured he would do what she said. After pulling his fingers out, he watched the warm liquid drip down his fingers as he smiled then slowly reached out his tongue to taste it. He grinned when he felt the warm liquid on his fingers. "Mmm you still taste good," he said with a smile as he untied his pants to reveal his cock to her. Slowly Derek put himself between her legs and took a deep breath. "Do I just, push-er-shove it in?" he asked grabbing it by the base and trying to find the hole. He pushed one but was too high and again but was too low. The third time managed to be one on and he slipped it in like it was pulling it in. He closed his eyes at the tightness as he looked down at his sister. "Oh, Stephanie," he said with a soft moan.<br/><br/>After sitting there for a few seconds, Derek started to move his body, pushing his cock in and out. "You are so tight," he said with a smile.