Kissing Toads

I kissed a smirking toad
I met along my road.
He remained a toad!

Later I kissed another,
May have been his brother.
He remained a toad!

After him I kissed a third,
Horrendous, the only word!
He remained a toad!

Four, five, six, seven, eight,
I kissed them all, defying fate.
They remained toads!

How long before the toad I kiss
Mutates into my charming Prince?