You spot a condom on the floor. You could tell it was a big condom and guessed that it must have fallen out of the box when you pushed it under your bed. But Mark continues to watches in anticipation and within a second you quickly grabbed it and placed it on to your cock. It hangs a bit off your cock but it doesn't matter, since it looked as if the condom was a bigger size than Mark (which is all you needed to put him in his place). You continue to jerk your cock as you hear Mark say "I told you that you don't need those to jerk off Scott". But it doesn't matter as you you feel yourself quickly cum wearing the condom.
You feel your body changing, and you watch your skin darken to an olive complexion before the small amount of blonde hair surrounding your legs and dick turn black. Suddenly you feel yourself growing and notice you're increasing in height before you feel your dick also growing within the condom and feel it begin to grow thicker as well. You close your eyes as you then feel hair beginning to erupt over your much bigger body as your arms and legs get covered in a light dusting of black hair along with the addition of chest hair and a much thicker bush surrounding your cock. Your dick grows longer while your balls begin to grow, dropping a bit lower than they were before and becoming the size of eggs.
Then you feel your body begin to shift as your body grows more muscular with your thighs and arms becoming thick. Unfortunately, you don't have time to enjoy your new muscular physique as you feel a slight amount of fat cover your body leaving you slightly pudgy. Then the changes stop and you open your eyes to see it's now empty and bare. You realize you had a slight idea who you had become but to make sure you look around your room to see a familar addition of a bathroom. You walk inside to see the reflection of your Dad staring back at you. The condom had turned you back into Jay!
You stare at your reflection recalling your previous encounter with Nick and feel your dick harden. You look down and take off the condom with the word Jay written on it, revealing your longer, and thicker cock, a slight bit darker than your new olive complexion . You continue to watch your reflection noting your slight 5oclock shadow had return and that your eyes had turned back to brown. But you can't get over the fact on how hot you look now. You had always thought your Dad-
you mean Nick, was attractive since you first met him but becoming his twin brother just seemed to turn you on. You walk out of the bathroom to find yourself back in the guest room you had previously stayed in when you were Jay.
Suddenly the door opens and Mark walks in with a towel wrapped around his waisy. "Hey Uncle Jay! Can I use your..." Mark begins before stopping midsentence. You feel a strane sense of deja vu as you recall reality had shifted. You were currently naked but unlike when you were Scott you don't feel embarrassed or worried about getting in trouble. Especially since it seemed the condoms had all returned back into the box under your bed. "What do you need Mark?" You ask him in you deeper voice. "S-sorry Uncle Jay! I just wanted to know if I could use your shower since the other one's Occupied" Mark says as you realize that he was beginning to blush. But you mostly notice him starring at your cock.
"Sure go on ahead Mark. I was just getting dressed" you lie but you still notice Mark gazing at your cock. It seemed possible that Mark had never seen his Dad naked so he must've been awestruck looking at yours for the first time. "Oh is there something weird about my dick?" You joke looking down at it. "Uh... not exactly... it's just so.... big!!!" Mark exclaims. You smile as you walk toward him and close the door behind him. You were now a few inches taller than Mark so it feel good to look down at him for once. "Is it that much bigger than yours?" You say with a mischievous smile. You were enjoying the role reversal.
Mark is still blushing as his towel suddenly falls to reveal his dick which looked just as you remembered, except now it was an inch smaller than yours. His brown pubes also seems to be much less matured compared to your developed bush now. "Oh no!" Mark says trying to cover himself but you just tell him "Don't be embarrassedd. You're still a growing boy. One day you'll be as big as me promise". Mark continues to blush as he apologizes for not knocking and walks into the guest bathroom before closing the door.
You grin over the recent situation and realize you felt a lot better than before. You then notice that Mark had left his towel and you enter the bathroom to give it to him only to see him teasing his nipple and jerkin off. "Uncle Jay! What're you doing?!?!" He says surprised. "You left your towel" you tell him giving it to him and making no acknowledgement of catching him in the act. "I'm sorry Uncle Jay but I just got hard all of a sudden" Mark says embarrassed. You then smile realizing that Mark had now gotten hard from seeing your dick instead of as before.
"It's ok. I won't tell anyone" you tell him before leaving the bathroom. You hear Mark lock the door this time and chuckle. Turning back into Jay was one of your best decisions yet but you realize that now you had a limited time frame to turn back into yourself before you/Jay had to return "home". You then decide to...