User blog comment:Omega natsu2/Emergency Request: Explain the Mysteries of Fairy Tail, Volume 6/@comment-5840892-20130327034528

Well, all I know for sure (100%) about Lucy is this: I hear that she fancies: and
 * WHIPS,
 * COSPLAY,
 * BOSSING PEOPLE AROUND.

Though, I am not surprised that Mira has a key to her room; I think Mashiama said something about that.

But the real question is:

WHY DOES NATSU ALWAYS GO INTO LUCY'S ROOM? ....

ESPECIALLY WHEN HE ALWAYS SEEMS TO SHOW UP JUST AS SHE IS ABOUT TO BATHE, OR WHEN SHE JUST FINISHED?

I think Natsu is a lot smarter than he acts....