Peeta's own brow knit back at her when Katniss explained what was going on. She was acting impulsively and didn't understand why. Peeta opened his mouth to ask if she had been drinking, because she was reminding him, ever so slightly, of Haymitch...but she didn't smell of liquor and Peeta remembered that she didn't like it; that wouldn't be it, so he didn't actually ask, letting his mouth close again without words. He wouldn't have been able to speak, anyway, once he realized what Katniss was doing, next.
Her body language had changed against him; Peeta felt as though they were back in the train on their victory tour all of those nights when he'd held her close in bed to help her try to sleep. She was pressing her face against him; her body and Peeta touched a hand against the small of her back. Her energy was waxing and waning so quickly that Peeta could barely keep up. And jokes...Katniss nearly never made them, so the one she made that threw him back into the time of the 74th Games, took him off guard all over again. "It does," he replied with a small smile, pushing away the associated memory and focusing on the fact that shew as making a joke at all.
Peeta's eyes widened right along with his surprised smile when Katniss shouted in his ear that they were going jogging, as though reminding him in case he'd forgotten. "Wow," he laughed, moving his arms around her to hold her up as she went a little slack, hanging off of him as she laughed more than he had ever seen her do. "All right, shouldn't you...change? We can't go jogging when you're in your jeans," he reminded her.