Maria glared at Erika as they both watched Maria's crotch suddenly expand. The first thing that happened was that Maria's previously shaved mound suddenly began to grow brown pubes, that covered her entire groin and spread up to her navel. "Wha, why are you growing hair down there?!" Erika cried as she pointed at Maria's newly formed bush. "Because teenagers have hair down there!" Maria cried back in anger, "then how come you didn't have any before?" Erika responded in confusion. "Because I shaved it all off!" Maria yelled back. "Eww" The younger sibling responded.
Maria then screamed in pain as she watched her clitoris protrude further and further out, quickly growing in both size and girth. "What did you do to me?!" Maria growled between shouts of pain. "I don't know, I'm sorry, I didn't mean too!" Erika cried, tears beginning to stream down her face, A fleshy sac then emerged from Maria's quickly shrinking vagina, and two small testes filled it, both however quickly expanding. Maria fell over in pain as her transformation, began to reach its end, Her clitoris, now a proper penis was ending its growth at around 5 inches while her two testicles were about the size of apricots. The pain subsided, and Maria looked down in horror at her new member. She had a penis.