You were just walking down the street, trying to get to your home. While walking, you noticed a cool looking golden staff with a red gem and fake wings. You thought it was just someone's prop, so you picked it up and acted like you were casting spells...which you were...

Eventually, the staff chooses you as it's magic wielder, and it started the transformation.

— DETECTED STAFF WEILDER. STARTING FEMINIZATION PROCESS.

Your body became much more girly, soft pale skin, short bobby hair, thick thighs, you name it. Your shirt became a crop top, your shorts became booty shorts, your socks became thigh highs, and your shoes became heeled boots.

You are now a magic femboy, do whatever.