Jim sighed. As much as he would love to keep his penis massive like this, he did need to leave the house in order to buy new underwear. However, he didn't want to shrink down all the way. Blowing the balloon up with 2 full breaths, Jim said "control the size of my genitals" again and released the 2 breaths. With a little sadness but relief, he watched his enormous cock shrink back down, from 11 to a still-large but manageable seven inch softie. Pulling up his underwear, he took some time to admire the bulge his underwear made as it attempted to cover Jim's cock. Even after Jim pulled up his shorts, there was still a definite bulge present.
Heading out the door, Jim almost ran to the mall but decided against it. Plus, he was enjoying the feeling of his new heavier cock. The weight up front meant his bulge bounced just a bit as he walked, reminding him of his new "gift".
Finally arriving at the store, Jim headed to the underwear section. He noticed that there was a section for "big packages". The slogan read "men who need some extra room up front". Well that was definitely him. Jim selected the medium waist (he was quite slim) with the largest pouch they had and headed to the changing room.
Once there, Jim tried on the underwear. It was a perfect fit waist-wise, and the pouch was more than enough to hold Jim's endowment. That gave Jim an idea... he blew one full breath into the balloon and smiled as his cock grew a couple more inches, filling out the pouch more.
Putting his shorts back on, Jim liked what he saw. The huge bulge stuck out in front and was instantly noticeable to anyone who looked.
He headed out of the room...