You suddenly heard your older brother come the door in the kitchen, he was five years older than you and was quite muscular due to the sports he liked to play, he also visited the gym often. Being only 14 yourself and quite skinny, you were envious of Jeff, as every little brother was of his older sibling.
"Hey squirt!" your brother greeted you, ruffling your hair up a little as he did so. You just rolled your eyes in response "Yeah hi Jeff!" you mumbled, as he sat down on the couch beside your sister Lauren.
"What we watching sis, same old crap?" Jeff chuckled, as he looked at her.
This was your time, even though you didn't know what your brother's reaction would be, if your power even worked of course, you were highly skeptical that it would. You looked at your brother's crotch...and concentrated. You shifted uncomfortably as you felt a tingling in your own groin, and as you looked down...you saw your bulge growing considerably, pushing out the front of your pants. After a few seconds the tingling stopped, and you looked back at your brother, still sat on the couch, his bulge didn't seem as prominent now.
You rushed into the kitchen and unzipped your pants, and you were amazed when your brother's eight-inch cock and balls spilled out of them, you had actually swapped genitals with your older brother. "Holy shit!! It worked!" you gasped, as you held your new dick in your hand and watched it grow to its full length.
A noise from the living room caused you to quickly tuck your new junk back into your pants, and after zipping back up you went back into the living room. Jeff seemed either not to notice at all...or he hadn't noticed yet that he now had a considerably smaller cock.
With a sense of excitement, you looked your brother over again, and you also looked at your 23-year old sister Lauren, who was filing her fingernails while watching TV. Just then your little sister Britney came downstairs and jumped on the couch in between Jeff and Lauren. "Can I watch the cartoons please?" the mischievous 9-year old shouted, causing Lauren and Jeff to just stare at her.
"Cause you can you little rascal!" Jeff smiled, as he started to pretend wrestle your little sister. Lauren for her part just rolled her eyes and crossed her legs, continuing to file her fingernails.