Life was boring without Natsu around.
And soon it would always be boring. He was leaving.
Natsu leaving was unavoidable.
And as much as it pained her Lucy didn't hold him back, in fact she encouraged him.
Because she knew him.
She knew Natsu places her happiness above his. She knows he hates not being by her side. She knows that he takes her opinion on everything into consideration.
Which is exactly why she told him what he wanted to hear even if he didn't want to admit it.
"Take it."
Because no one knew him better than she did.