It's the mask. It's entirely the mask. But maybe more than that, it's the fun she's having right now. Fun she never thought she'd have, fun that he's taught her. By now, Katniss knows that she'll never stop owing Peeta Mellak. But rather than feel uncomfortable at the fact, she's grateful for it. Grateful for every little thing he's ever done for her.

She props herself up on her forearms, watching him study her body. The look on his face excites her, makes her smile all over again. "Do you see something you like?"