Mike thinks a little bit and chooses to try "transform" mode first. He has been dreaming about transformation all his life, even in the childhood he most liked tales about someone ending up transformed into something or somebody. So why would he miss the chance to make dream come true?
Who Mike would like to transform? Or maybe who or even what he would like to become?
Maybe, he would like to become The Best Girl Ever and be the sexiest? Or maybe he would like to become not a full girl, but a part of her - hair, legs, maybe even boobs or pussy? Or maybe he would like to become a property of the girl, maybe intimate property. Or maybe he would like to transform every human on the Earth into his sex slaves, maybe even including himself? Everything is possible with this gun, even becoming an actual president of US and starting a nuclear war. Or investing billions of dollars into gender changing clinics and worldwide TG lobby? Who knows what Mike will choose and how it will alter the reality and himself - he is now the most powerful men on the Earth. Or women, of course.