[That seems simple enough. Kaworu does as he's ordered, stripping Axel of the rest of his clothing and staring at him for a moment - he's not really sure how to judge attractiveness, but he thinks that Axel has a good body. Firm and defined. He smoothes his hands down Axel's chest, noting its unusual warmth - he has touched Lilim before, after all, and none of them ever gave off quite that much heat. So naturally, he asks about it as he continues to caress Axel's chest and abdomen.]
Why are you so hot? [Yes, Axel, he means it literally. Angels don't do innuendo.]