The warmth coming from Meg, it was something that not only warmed him but also made him more aware of the effect she was currently having on him. Not just her body against his, her scent permeating his senses and the little gasps for breath she took at the same time he took his own, when they parted. His body was reacting, flushing with its own heat and it was the sort of warmth that made him desire his clothing less. So often he wore his clothing as a sort of security blanket, like his coat was something that shielded him from the world, from the elements of it but Meg was someone he didn't need that protection from. He already had been vulnerable with her and he was comfortable with that. He also realized that he wished that her clothing was gone, as well.
When she pushed him back, he wasn't sure of what was happening, because he thought she was going to stop things. That she was informing him of where he was ill experienced in this or any of the other myriad things that could have made her stop. The relief wasn't easily evident on his features when she began to speak and even as she began to tug at his shirt. He complied with her request, allowing her tug his shirt upward. "Would... you like me to help you?" He asked. It was clumsy at best, but he wasn't sure if he should aide in taking his shirt off or not. His only experience was a brief time of being a man without memories and the films with the pizza man.