She had something on her mind, that much was obvious when she answered him quickly about whether or not to put another log on the fire. Of course, she distracted him from pressing her about what she'd been thinking by moving his hand beneath her shirt a bit. Lucas was shocked for a moment and then his brain caught up to what she was suggesting. Riley hadn't ever encouraged him when his hands slid underneath her shirt, either let him keep them there on her waist or gently nudged his hands back over her shirt.
The fact that she was encouraging it now, it was kind of a shock to his system and once he realized it, he sort of started to run with it. Ordinarily, Lucas would have checked in with her again, just to be one hundred percent sure, but this was coming on the end of their world basically and he could only be so good all the time. He slid his hands up her waist toward her breasts, his touch tentative and a little clumsy, but he was so caught up in how amazing she was and how much he loved her. He was only going to get one chance at doing this for a first time and he didn't want to mess it up, or give her any reason to regret it.
"Love you," he murmured again as he leaned in to kiss her.