Whistle Wishes

I pucker my lips,
Then I blow and I blow.
I look in the mirror
To get them just so.
My lip muscles twitch
And my breath comes out fast,
But there’s no sort of whistle
That goes sliding past.
I wiggle my tongue
Into various places,
But all that I make
Are ridiculous faces.
I’ll never give up though.
My mouth’s pretty clever.
I know that my whistle
Can’t hide there forever.