Your cum has powers

"Take me, John" Susan yelled. But you wanted some adjustments first. Her tits were far too small for your liking. So you implanted in her mind that she wanted the biggest rack in the world. However, you also wanted her to prioritize that first before she could have your massive man meat.

Snap

Susan suddenly reached for her breasts frowning. "John, I'm so horny for your cock inside of me...but my boobies are so...small".

"What do you mean mom? DD cups are plenty big enough. " as you gently squeezed a breast in one hand, marveling at its shape and firmness.

"Not for me...for you. I was made to be the biggest. I have to be the biggest. My tits must be the envy of the entire world." She said squeezing her figure, running her hands down to her slit.

By now your cock was at a full 9 inches and round as Susan's forearm. Your already sexy mother wanted massive tits and you had the power to give them to her. She sucked your dick lovingly when you got an idea. You turned your cum into a fast acting growth serum. Once it comes into contact with its target, it will immediately grow. Of course you can control the rate but you mother did have to know that. You were going to turn your mother into exactly what you and her wanted her to be.

"Mom...what if I told you my cum will make you as big as you want."

Her eyes lit up "OH John DO YOU THINK SO?" She bounced up in front of you, her rack shaking. "I know so mom. The more cum you swallow, the bigger you will be".

"YAYYYY I'm going to have the biggest titties ever! I want all of it. Do you think it can make my ass bigger too?" She turns around, twerking her shapely but admittedly small ass on the head of your cock. You may have been a little lax in your parameters for growing, but this wasn't bad at all. Grinning you say, "Sure mommy, if you think you think you can handle it."

Suddenly she flips around, her eyes snapping to yours, "John I want the biggest tits and ass in the world. I want to see them grow right in front of me". She wastes no time dropping to her knees, opening her mouth, and wrapping her soft lips around your shaft. Her long beautiful brunette hair flows as she bobs on your cock making lewd sucking sounds. She can feel your muscular cock tightening, ready to give her what she needs.

"Fuck baby I want your cum in my mouth." *slurp* "Make mommy's tits bigger pleeeaaasseeee" as spit fall from her lips. You begin to pump your cock in her mouth. Precum oozes from your dick and already her tits expand a little to an E cup. They fill like water in water balloons as they brush against your legs.

Susan notices and stops her blowjob "John look! You haven't even cum and I'm bigger! Give mommy more cum. GIMME GIMME" You gladly obliged and grabbed the back of her head and instantaneously emptied your balls into her mouth, but you wanted to enjoy this so you emptied a "normal" sized load into her mouth. No need to rush things. You have plans.

Susan's eyes glazed over but she only pulled your cock deeper into her mouth. Her eyes were on fire with desire for the biggest rack on the planet. Her tits had expanded to EEE cup cantelopes in a matter of minutes. They stood perky and full but still soft and natural " John my tits are big but baby mommy said the biggest. You better have more cum for me." She pinned you down on your bed and licked your shaft like a lollypop until you felt your balls tighten again.