Jon hadn't noticed that since he said at least one person it could be any number of people.
Jon went back to his bedroom. And after a few minutes, His Mom walked by Jon's room Jon saw her and was Shocked Her breasts had doubled maybe tripled in size she was wearing a micro-mini skirt, and Jon could see her dick hanging out of the skirt. Jon was Disgusted, she didn't even notice the change.
Jon went downstairs and Saw a teenage Boy and Girl Making out on the couch, he knew this must have been because of his wish, after a bit Of Clever deducting he realized that it must me Zoe and Mikey. But when they turned to look at jon He realized that the one with short hair and guy clothes was actually a girl, just hiding her breasts, and the one in the mini-dress was actually a guy with fake breasts he could see his erection through the dress.
"eww this is gross Jon thought "how many other people were changed by this wish"