I Gender-Swapped into a Little Girl, and Life Doesn't Seem So Bad

[Little Girl + Gender Swap + Marriage + School Life + Heiress, No System, No Angst or Meltdowns]

I woke up one morning as the young master of a wealthy family and found I'd turned into a little girl. Worse, my mom found out. What do I do? Help wanted. It's urgent. After they learned everything, my parents' change in attitude, my older brother's doting affection, and my buddy's change left Lin Qianyu completely bewildered. But things had come to this, so she might as well have fun.