You select "Yes". Her butt is now growing again, bigger than it is possible for a human's butt to be. Suddenly, you realize that if her ass keeps growing, soon her butt will outgrow even the large room that she is in.
And soon it does. Now her butt is filling the entire room, and her ass is pressed against the glass wall. You cannot see anything else through the glass. BLAM! You thoughts are scattered by an ear-shattering alarm, louder than any sound you can ever remember hearing: "STOP EXPANSION IMMEDIATELY! SUBJECT'S BUTT WILL DESTROY BUILDING IF EXPANSION IS NOT STOPPED. THIS IS YOUR LAST CHANCE. STOP EXPANSION IMMEDIATELY!" repeated over and over. What do you do?