My breasts are really small compared to other girls.
It's our first time but I'm very embarrassed because of this. You mention that you have powers to make my breasts grow as I orgasm. They grow bigger and bigger and I get more and more turned on, begging you to make them even bigger.
Eventually they stop growing, but instead you've made me appear pregnant. My stomach has swelled to where I look like I'm 9 months along!

Since I don't want anything else to happen, I have you watch me masturbate and enjoy the new growth before it goes back to normal.