You were looking at your gun and starting to program the thing, and then your sister Michelle came in and said "Yo runt! anything interesting in that package?" despite the somewhat harsh nickname you two had a somewhat good relationship.
You said "Found this silly gun on e-bay... I thought it was some joke air pressure gun called the breastinator... but it says that it can change someone's boobs... or make a guy into a girl and then mess with their boobs..."
Michelle looked at her chest for a moment and said "want a test subject? I've caught my friend looking elsewhere..."
"how big do you want them? I think I can-"
michelle said "make them as big as your want and then i'll say if they should shrink a little bit."
you started putting in the command "set breast size to f-cups" and shot her. what happened?