You continued to fondle your breasts, moaning in pleasure as you pinched and twisted your nipples. You weren't sure what kind of science or magic was happening, but you wondered if it would keep working with other pieces of clothing.
You looked down into your mom's underwear drawer and saw her lacy panties lying there. Your mind was racing: was it really possible to completely change your sex and become a woman with breasts and a pussy? The thought make your small cock, which was already hard from the waves of pleasure raising from your boobs, leak and throb.
The sudden awareness of your tiny cock made you feel the same feelings of inadequacy that you have been feeling since you saw your dad's dick by accident in the changing room at the pool. He has a massive cock, it must be at least 10 inches. And you probably saw it completely flaccid.
The thought of potentially having a massive cock to go with your massive boobs was overwhelming. You slammed your mom's underwear drawer closed, tore open your dad's drawer and grabbed the first pair of boxers you saw. They were the loose kind, with a worn out elastic and a light yellow stain in the front. You bent over, your boobs resting on your flat tummy, and you stepped into the boxers and pulled them up over your waist.
You looked back in the mirror and admired what you saw. Your big boobs were heaving slightly from your rapid, excited breathing. They were perky, but they hung low because of their heft and because of your small frame. They practically hung low enough to cover half of your stomach.
You looked down to the boxers, which were close to falling off of your slim waist, but you suddenly felt a familiar tingle in your groin. A huge smile burst across your face as you watched in anticipation.
Surprisingly, you felt your butt inflate first. Your dad had a massive bubble butt, so it made sense that his underwear would bless you with that attribute. You turned around and glanced back at yourself in the mirror. Your butt was now huge! The boxers which had once been about to fall from your body were now stretched to their limit, straining to contain your fat ass. You grabbed the waist band and struggled to pull them over your cheeks. You were pleasantly surprised to see a coating of dark, coarse hair covering your ass. Your dad was a hairy beast!
You gave your butt cheek a light slap and giggled as you watched your ass giggle. Your giggles turned to moans as the vibrations rolled through your body and up to your sensitive breasts.
You also felt your cock bounce with significantly more heft. You felt cool air in your shaft and balls, which must have popped out of your fly. You looked down excitedly to see your new daddy cock, but your massive boobs were blocking your view. You spun around and your mouth fell open at the sight of your massive cock bouncing around outside of your (well...your dad's) boxers.