Your cum makes her tits bigger

You reach down and jerk your shaft while you fuck her. This dick is ridiculously long.

The door burst open. Your half-dressed mom stands in the doorway. Your dad’s voice booms from her body, “Don’t come in her!”

Too late.

You groan and pump your brother’s wife full of cum. Your cock feels like an out-of-control fire house. It shakes as cum blasts into her body. You have to hold it steady so it doesn’t fly out splatter cum all over the room. Holy fuck. This is the most intense orgasm of your life, and it won’t stop.

Your sister-in-law’s moans of pleasure turn to screams of pain. A gallon of cum overloads her pussy. It invades her body. It looks for a place to go. She grits her teeth and clenches the bedsheets. She whines, “Ohfuckohfuckohfuck.”

She squeezes her eyes shut tight. Inside her body, cum reaches her already big tits and fills them. Her already big tits grow even bigger. They’re heavy and sag more. Fuck, they grew at least a cup size. Your sister lets out a gasp of relief as the pain disappears. She pants and holds her sternum.

Your dad (in your mom’s body) says, “I forgot to tell you I altered my cum. It’s designed to make a woman’s breasts bigger.” He cups your mom’s rack. “When I married your mother, she was as flat chested as your wife.”

Your brother yells, “WHAT THE FUCK IS GOING ON!? MOM SOUNDS LIKE DAD. DAD HAS AN ANACONDA BETWEEN HIS LEGS. HE FUCKED MY WIFE SO HARD HER TITS GREW. This is a fucking nightmare.”

You don’t care about your delirious brother. You just heard the part about the cum making tits bigger. You know someone who needs bigger tits.