Derek smiled and shivered once again. Her playing with his pre-cum turned him on like nothing else. "Could we sneak away without being suspicious to them?" he asked softly as he felt his cock become full and hard. "I want to have the full experience from you sis," he said softly. His fingers rubbed her a little harder. "My cock is ready to please you...Let's go now," he said quickly grabbing her hand and starting towards the door. He was determined to have his first REAL experience, he didn't care anymore if he got caught.