Julia was so surprised by seeing her delicate left hand morph into a large muscular male hand that she dropped the flashlight she had been holding in her other hand. The torch dropped right between her legs – with the light shining towards her!
Since she had been sitting up in her bed, her crotch was bathed in the beam at the most intense blue setting. And since she was not touching the flashlight at the time, she had no idea that it was transforming her 19 year old pussy into a very large and thick penis. Along with the physical changes, her panties had been morphed into boxer shorts – after all, a girl's gotta free her beast at least at night!
Julia inspected her hand and quickly deduced that the light had not only changed her sex toy but also herself. She picked it back up and pointed it had her unchanged hand. It too grew to large proportions and eventually matched her left hand.
She grinned and switched off the flashlight. "Wow, with this hand I may actually be able to reach all the way around my cock," she said to herself, "I may even be able to jerk off one-handed!" With that thought, she pulled off her boxers and started to pumping her already hardening member.
Having a bigger hand, made masturbating feel different from all the times before. It came much easier to her and the additional kink of seeing a male hand wank her off helped her cum in no time. She managed to react just in time to catch the 6 powerful spurts of seminal fluid in a small washcloth that was lying next to her.
Sexually satisfied, she lay down of her back with her gradually softening cock still oozing sperm.
Her memories had been altered too, so all she remembered was growing up as a girl with a penis. At first it was a regular sized dick but upon reaching puberty she grew to the astonishing 13.5 inches she now had hanging between her legs.
As a baby, Julia's parents had raised her as a boy. But soon she realised that she was a girl. Her parents were very enlightened and enabled her to grow up transgendered. However, they did not need to give her any testosterone-inhibiting medication since – except for her genitalia – her body never developed any male features: she remained petite, her voice stayed high, her breasts started budding and ended up at an average B-cup. Except for beneath her axles and in the pubic area, she had no nasty body hair. And being a kempt young woman, of course she epilated those areas.
Once Julia had recovered from her post-orgasmic glow, she put on her boxers and snuck out of the room to rinse off the cum-stains from her washcloth.