Jon's Idea

Jon then had an idea, he would put on some of his sisters larger clothes that had not been altered by the previous wish. He made his way to her room, jiggling all the way. He flung open her closet and saw that all of her clothes were normal.
He picked out a large white blouse, and a dark, full zip jacket, both of which looked like they could contain his new cleavage. He took the tight, revealing blouse off with some difficulty and caught sight of himself in the mirror on the back of her door. Each of his new breasts was the size of his head! He picked on up with both arms, which he noticed gave his back a rest, and felt the weight of it.
He then remembered what he was doing and turned his attention back to the tops he had laid out on the bed. He began to do up the button of the blouse, which was difficult due to his cleavage obscuring his view. He finally got to the buttons that were in sight, only to find that the top three were missing.
He hurriedly put on the large coat, only to find the zip got stuck just low enough to reveal his cleavage. The coat was also rather tight on his new body, pushing his breasts up, and making the cleavage appear even larger.