One fantasy overshadowed all others in Ty's head. Since he'd first begun puberty, he had known how his body was developing felt wrong. He didn't want to have a body that could fuck others and get them pregnant, he wished he had a body that others could fuck and make pregnant. He knew a boy shouldn't want that, especially because it wasn't possible, but with his power, it was possible. And anticipation surged through him as his powers began reshaping him as they had just done to Dustin.
He got up from his bed and wandered to his closet mirror on shaky legs, and saw how his face and skin had softened and smoothed all over. The faint whisps of facial hair across his face had vanished, as had the bulge in his throat, his voice now softer.
A twinge shot through his chest and he pulled off his pajama shirt to see his nipples had grown larger and puffier. He bit his lip as soft flesh swelled around them- these were breasts! Ty felt acutely aware of what his powers were doing- changing him from male to female.
This was affirmed as the changes moved downwards. Ty slipped off his pajama shorts and underwear, naked as the day he was born, and before his eyes he became castrated and emasculated. His penis shrank into a sensitive little nub, his testicles slipped up inside him to reform into ovaries, and his scrotum flattened and the seam down its middle peeled into a pair of moist lips.
Ty stared at herself in the mirror for a moment, allowing it to sink in. She was a girl now, and it seemed to fit her way more than being a boy ever had. Her body was pretty, so soft and petite!
Her heart missed a beat when out of the corner of her eye, she saw a young man. The boy was about her age, also naked, and way more handsome than Ty felt he'd been as a boy. He had subtle muscles and a toned figure, and as he stepped towards Ty she also realised he was quite a bit taller than her.
She became aware of another significant difference between him and her when it rubbed firmly at her ass and back. Her nipples and the nub which had been his own phallus grew firm and excited, and her pussy leaked strong-smelling juices.
The boy's firm hand took Ty's own petite one and led her over to the bed, before he pushed her down and got atop her, kissing her forehead. "You want to get bred, right?" he whispered sultrily in her ear. Ty nodded wordlessly, and he smiled, "Good, cause I want to breed you."
His cock head slid down her stomach and brushed over her clit, making her shiver, before tracing along her slit and pushing inside. As he did, Ty gasped, clung to the bedsheets, began panting- and felt her despised manhood dissipate. Her lover played with her boobs to ease her into him starting to move.
How it felt when he moved made her feel like her mind would go blank. She whimpered and moaned in pleasure, her arms clinging to him as his balls slapped at her crotch, and he gradually moved faster and firmer, his cock head rubbing against sensitive and freshly-formed spots inside her.
When she heard her lover groaning and grunting his way to climax, her own orgasm arrived almost in sync. She clenched around his cock as it pumped thick, warm, white ejaculate inside her, and as her eyes rolled back with the pleasure, she saw her lover's sperm surrounding an egg in her ovaries, eating their way through its outside and fertilizing it. It moved into her womb and made her pregnant with his offspring.
Slowly Ty returned to Earth, and as she felt her handsome lover resting atop her, slowly her understanding of her sex change and pregnancy- and the consequences- settled in...