You're my magic apprentice- and you're doing an absolutely terrible job at paying attention to these lessons! It's time to discipline you for your carelessness- so, as punishment for focusing so intensely on my chest, instead of learning, I'm using a boob growth curse. Every time you glance at them, and get even remotely horny, they'll get bigger and harder to look away from. You can jerk off, have sex, it doesn't matter- your hard-on won't go down until you cum in your pants. It could be minutes, hours, perhaps days from now- the only way you can end this disciplinary lesson is by jizzing your pants. My breasts grow larger and larger as our day progresses- until you finally can't hold it in anymore!