David had soon turned his attention to the two Asian girls that had not yet been swapped, unlike their two friends. The first one, 5'4" was the tallest of the group, but that wasn't saying much. From eavesdropping on their conversation, he heard her saying something about trying out for the college's athletic team, and her aspirations to become an athlete. "Not while being that small you're not." David chuntered to himself, deciding on another height swap.
This time, the boyfriend of the blonde girl, who had already lost his penis to one of the other girls and gained that same girl's perky boobs, shrank down until he was just 5'4" tall, a couple of inches shorter than his girlfriend with her new paltry boobs. The Asian girl on the flip side looked much more suited to being an athlete, now standing 6ft even. But David wasn't done with her yet. "And you're gonna need strong legs to be a sports star I think." David grinned, swapping out the girl's slender, smooth legs with those of the muscular looking guy reading the text book. Since the girl was wearing a short skirt, David actually saw her legs morphing into the guy's muscular, hairy equivelants, and this gave her another two inches of height.
"That's better, good luck with the new career." David chuckled to himself, switching his attention to the last girl, who had her hair platted and hung over her left shoulder, she was not as cute as her three friends, but she wasn't ugly either, and she was about 5'3" tall, wearing a pink t-shirt, skinny jeans and a pair of flats. After pondering who to swap her with, David eventually selected the black guy who had entered the library not that long ago.
A rapid series of swaps saw the girl's platted hair recede into her head, forming into a Ranger-style haircut, her high pitched, typically schoolgirl voice dropped in pitch, becoming the black man's deep baritone, and then her body began swelling and rippling with muscles as David gifted her with the black guy's physique. Her clothes did alter slightly to accomodate the new muscles, but they were still stretched. "God, this is awesome, and she look and sounds great." David nodded in glee, giving his erect member another rub through his pants.
Briefly switching his attention back to the tall Asian girl who now had the hairy male legs, he decided to 'gift' her with one more swap too. Thinking back to all the times he had watched the track and field events in the Olympic games, one thing David had noticed was the fact that all the guys, especially the black runners, had huge bulges in their lycra suits. David saw no reason why this girl shouldn't have her own so that she could 'blend in' more in any future track races she took part in.
Using the black guy as the donor again (and he already looked and sounded ridiculous with the girl's platted hairstyle, her high pitched feminine voice and no muscles to speak of), David focused on the still impressive bulge in his jeans and watched as it disappeared. The now 6'2" Asian girl (like her friend had earlier) parted her legs to allow the 8-inch ebony penis to grow from her crotch... tenting her skirt. David got so turned on as he turned yet another girl into a she-male, and he decided to leave the skin tone of her new member as it was, for the contrast. She'll be winning the 100 meter sprint in no time. David laughed inwardly.
He then turned his attention back to the other people in the library.