[Luke would probably be more embarassed by Kaoru's nudity than Kaoru, though. :3
This just makes him laugh a little, even if it is pretty strange to have his personal space invaded by someone who isn't his brother - anyone else and it's him doing the invading, after all - but he just goes with it, sliding his hand down Luke's chest and then up his shirt before leaning in to blow very lightly on his ear. It certainly speaks of his skill that he's not cracking up while doing this.]
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This just makes him laugh a little, even if it is pretty strange to have his personal space invaded by someone who isn't his brother - anyone else and it's him doing the invading, after all - but he just goes with it, sliding his hand down Luke's chest and then up his shirt before leaning in to blow very lightly on his ear. It certainly speaks of his skill that he's not cracking up while doing this.]