Obstinacy
"No." He said, scowling.
"Aw, why not, Vaughn?" She whined, her pink lower lip set in a pout. He frowned at her, mentally smacking himself for realizing how adorable she looked just then.
"Because," he stated simply, bringing his hat down to cover his eyes. Chelsea scowled.
"C'mon! Lemme try your hat on—just once, please?"
"No."
Huffing, Chelsea turned and started back towards her ranch, leaving a smirking cowboy behind her.