Wow, it's fascinating how we can read it so differently. I thought Clark was sort of letting it happen but not initiating, and I don't really understand why he would let it happen except that Clark tends to accept interest from anyone that offers (*snerk*). Only at the very end once Lois had put her hand on his chest and leaned up to kiss him did he bend to kiss her and then he pulled back first (but fair enough). I sort of agree that Clark had the 'upper hand' but I read it as him being the less invested so he didn't have anything at stake, whereas Lois really did.