Hi babe, of course I want to help you live out your giantess fantasy, let's do it! Your girlfriend Sydney is all ready to have some good sex, but you tell her you have something else on your mind. You want to jerk off to her ass, but you say that you have a special power where your jerking will actually make her grow in size! She thinks it's a bit strange but she's down. So she has you take off your pants and sticks her butt in your face. Immediately you start jerking to her ass and suddenly she feels a bit odd. She's feeling super warm inside and finds herself growing. She can't believe how good and powerful she feels. This is so amazing! You're now only half the size you were compared to her ass and she orders you to keep jerking. She wants to grow even bigger! She demands you keep jerking as she just grows and grows, until her ass is simply two huge giant buttcheeks in the sky. She feels like she could rule the world at this size! You can't believe how big she's getting but you can't stop jerking to your giant girlfriend and her new found sense of power!