Usually, Chris wouldn't argue to being kissed by Rae, but he knows that it is most likely going to lead to more, and he can't really do that with Rosie sitting in his living room. He does return the kiss at first, but he also has to keep his perspective, so after kissing Rae for a while, he gently pushes him away, breaking the kiss. "I can't," he says, trying to catch his breath again, "not right now at least."