As you watch, you find yourself growing again except this time you exceed past 6'. "What the- this is new" You say in surprise. Then you feel your limbs extend until they're evenly matched. Then the strange vibration emit through your body and the other changes begin
You see you skin grow lighter until it's a pale hue and see an array of freckles cover your entire body. "This body can't be Jimmy's!" You say. "So who am I turning into?" Then your chest expands and two large developed pecs rise along with a six pack. "Jimmy definitely did not have those-" You stop and notice that your voice had deepen far past Jimmy's voice. Your muscles continue to grow as both your arms and legs thicken and widen until they're equipped with muscle. Then you feel your ass grow bigger and firmer.
"Damn! I feel huge!" You say in you new deeper voice. Then you see small spurts of hair erupt on your pecs until a treasure trail and body hair become prominent. Your armpit overflow with hair while your pubes seem to grow out of control until a huge bush of ginger pubes cover your tiny dick. Then you moan as your dick extends past 6 inches until almost 9 inches. Your balls drop and grow to size of golf balls. You see your face and notice your hair growth curly while your face extends.
Your ears grow larger and your face is covered by a ginger beard. When your face completely becomes proportional the changes end and you feel the sense of vertigo fade. Looking in the mirror you could obviously tell who you were: Jacob!
You were Jimmy's older brother! You flex your new muscles and smile. Damn! You never realized how hot Jacob was before... especially with the monster he was hiding in pants. You look down and see that's it beginning to drip precum. You walk to your bed and take off the now tight shoes and magic socks. Then you slowly began to jack off.
"Ooh" You moan. Your new body felt so much more horny than your old one... you jerk off until you cum over your new six pack. You get up and clean yourself and then decide what to do...