Of Red Lights and Their Flowers

Kakashi didn't know what hit him when he gets an unexpected reaction to his special attack "1000 years of pain," and finds himself grudgingly hooked on the juxtaposition that is Naruto. In his quest to uncover his new pupil's secrets, he slowly starts to catch feelings and knows that something must be done.

OR

In which Naruto is a part-time prostitute and Kakashi doesn't know how to feel about that.

(19k words of content, heavy smut warning in 2nd chap.)