Note: I am changing the app’s last sentence slightly from what it was last chapter
Aaron looked at the sentence the app had just generated on his brother and blushed after reading it.
“Tyler’s little cock has grown hard after seeing his brother dress in women’s underwear”
Aaron was relieved that Tyler wasn’t embarrassed by having his older brother crossdressing, but he wasn’t expecting him to get arroused by that fact. The part of Aaron from his first reality knew he should feel weird about it, but the new Aaron couldn’t help but find it flattering that his brother got an erection from him.
Looking back at the app Aaron was about to close it and finish undressing when he noticed something in the sentence. In the wording of the sentence it deliberately used the word “little” to describe Tyler’s cock. It wasn’t surprising to Aaron that his younger brother would have a small penis but now that Aaron had the power of the app he felt his brother deserved an improvement. His initial thought was to just change “little” to “big” but that would just make Tyler normal have a big cock, which felt a little boring to Aaron. If he changed “hard” to “big” it would cause Tyler’s cock to have a surprise growth spurt, which felt more interesting and erotic to Aaron. Before he could settle on that change though an horny thought came into his head as he imagined the cock expanding and growing, “we can do better than ‘big’”
Aaron ended up settling on changing “hard” to “huge” which made the sentence now read
“Tyler’s little cock has grown huge after seeing his brother dress in women’s underwear”.
After accepting the change in the app the sentence disappeared and reality shifted. Aaron then felt something happen to his body and looked down to find his panties bulging out much farther than they had been earlier. Pulling them off he found his cock and balls had gotten bigger. They were not huge like Tyler’s should be right then but they were a good deal larger than what had been the average size. This would have been a dream come true for the Aaron of this morning but now he felt a little disappointed because it didn’t fit the feminine style he was now going for.
Aaron searched his new memories of this reality to see what had caused him to change as well, and found that this reality had a peculiar mutation that appeared in certain family bloodlines including his own which had their male descendants grow more endowed after their first sexual awakening. This had happened to Aaron some years back and it had grown his dick from 3 inches to an impressive 8 inches. The mutation was rare but not unheard of by normal folks so it hadn’t really changed much with Aaron’s life. He had still been friends with Sam and Rita, and he had still decided to join the crossdressing academy.
After Aaron processed his thoughts on the changes side affects he refocused on the main effect of this change, Tyler’s cock.
Pulling his panties back on and making a big femboy bulge in them, Aaron crept from his room to spy on Tyler. A very bisexual Aaron peered through his brother’s keyhole and got a glimpse at what he was hoping to see. Tyler with only his shirt on stood in the middle of his room a massive cock hanging between his legs. It looked mostly flaccid to Aaron yet it had to be at least as big as his own cock when it was hard. Huge was really the best word to describe it and as Tyler flopped it around apparently still getting used to the feel of it Aaron saw that his balls had grown to match. They both hung low almost halfway down the young boy’s thigh like two billiards balls in a hairless sack. Aaron regretted not being able to witness the growth but it was still worth the change to get just a glimpse of that delicious cock.
Before Aaron snuck back to his room and finished charging out of his school uniform he used his phone again to check how Tyler felt about his new huge cock.
“Tyler is excited at how big his cock has grown but worries it will be very tight fitting it into his underwear”