"...my dad. You'll be the father I never knew"
"Your DAD?" your girlfriend questions. You have always wondered about who your dad was as, and now you got the chance to meet him!
There wasn't much time to ponder this though as your girlfriends changes had begun. Since you were now the age of 23, your dad was about 43, and your girlfriend's age seemed to be changing too.
While she grew several inches taller than her 5'2" height, her hair was receding into her scalp.
Her hair, which was shoulder length and light blonde, was now sghorter and turning a deep brown.
While this was going on, all her clothes seem to have vanished to allow her to keep growing in all areas. Next was her breast, which inflated on a expanding chest, then went a curly covering of hair.
Her arms and legs became more muscular and hairier than before, and a beer gut formed around her belly, under an abundant treasure trail. Finally her face and voice both seem to contort and reform back to that of a man on his 40'.
"What... who.. who am I?" Asked your former girlfriend in her new booming voice.