Pin Pains for Poster Boy!

With a well-balanced head, she stuck on to his to-do-list through morning, noon and night.
And every time he crossed his work-station, she beamed and held on tight!

So when he put her on his wish-list's forehead, she secretly made her own.
She longed for him to hold her between his fingers and press her against the foam.

While her violent predisposition made her want to pierce right through his heart.
It might've been easier if she was a strong-legged, big-bosomed dart.

Alas! Dear Thumbtack, 

You'll only be his pretty Pin-up Girl!