Drew hadn't seen the gun as anything more than a toy and didn't see the settings, but right after he pressed the button he realized that the gun wasn't a toy. His body expanded a bit, his muscles and testosterone increased, his dick started to be active, he started growing more hair, and he started to notice things like some of the young girls in the dubbed anime show had nice figures. His clothes were tight but weren't outgrown. The boy didn't really grow taller and you could still tell he was young.
Sue on the other hand had the opposite change. Her boobs completely shrank into her chest, her vagina reverted back to it's immature form, her hips and butt shrank, and the only thing she had was a childish 16 year old face.
Sue demanded "Drew return me back to normal this instant!"
Drew was ignoring her and was more interested in the new feeling in his dick and thinking what the gun could do. What did drew do though?