I've thought of a little game to motivate you to gain faster... For now on, you are going to wait until you've reached the goal weights I've set for you to cum. You'll wear a chastity device, and when you've gained to your goal I'll take it off and let you jerk off, feeling your delicious new weight. Don't worry, I'll start easy with you, 5 pounds til your next orgasm. But as you balloon bigger and fatter, and eating becomes more and more pleasurable to you, your goals are going to get a lot bigger...