Anna blushed deeply at the position that was suggested, but she nodded and crawled onto Mike's lap. She shifted around until she was positioned over him, then slid down slowly. She gasped as she felt his cock slide into her wet and ready passage. Once it was all the way inside, she paused, making sure she was in a comfortable position. She looked over her shoulder at her uncle questioningly as she slowly started to move up and down, wondering if she was doing this right.