Answer:
My first is a heir; My second's a snare; my whole is the offspring of fancy; which I sent out of play upon Valentine's day As a token of love to my Nancy.
I am a key that is playful. What am I?
I stand in one place yet fill the whole room. I can be filled with molten rock and come in every hue. What am I?
I crushed on Wendy Darling.
I grow up while growing down
Give it food and it will live, give it water and it will die.