But you eat food containing 4,000 calories after the session because it made you hungrier. Your partial derivative of weight over exercise is the negative of whatever weight 3,000 calories represents. Your partial derivative of food intake with respect to exercise is 4,000 calories.“Well, that situation, while not continuous and, thus, not really dealt with by derivatives, represents a common physical situation. Z is a function of X and Y; Y is a function of X. The partial derivative of Z with respect to X represents what would happen if Y were held constant. I really need paper -- or a blackboard.”“You really need an audience which is up to speed on that. Remember what happened with your AP calculus?”“Don’t remind me.”“You performed perfectly honorably. Your high-school teacher didn’t do what the course description claimed it would do. You fell behind in college. You learned what you needed to know by yourself. But you needed to know a fraction of a semester’s work. To follow that. She glared at him, but decided to keep playing along, crawling towards the kitchen.She felt his gaze lingering on her ass in as she crawled in front of him, knowing he could see the plug he made her put in, and she was ashamed and very aroused at the same time. She stopped at the entryway, waiting for him to make the next move. He held the candy in his palm and said, Here you go, girl. She lifted her hand to take it but he shook his head. After a moment she nuzzled his hand with her mouth and ate the candies. He patted her head. If you want more, he said, eyes dancing, follow me. He walked to the bedroom, leaving a trail of candy in his wake, then stood in the doorway, watching her. Slowly, she picked up the closest M&Ms and ate them delicately, carefully, never taking her eyes off his. He was frowning slightly, but his cock was very hard.And that was the treat she really wanted, so she crawled the rest of the way down the hall towards him. When she reached him, and placed her cheek.
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