Moonlight's primary motive for doing this was to understand Derick's sexual preferences. Although he had never explicitly stated his preferences, after so long engaging in sexual activities, the women in the harem had gained some understanding of Derick's tastes.
For example, he had a fondness for stockings, especially black and white ones, or even pantyhose. He also liked uniforms, which is quite normal as most men do, including police uniforms, sailor suits, Lolita outfits, flight attendant uniforms, and so on.
Another unique preference was his inclination for collecting, such as mothers and daughters, sisters, or policewomen. Whether individually or together, these collections had a special appeal that could further excite a man.
Additionally, Derick tended to prefer a more youthful appearance, such as feeling particularly excited when encountering a "white tiger" (a term for a woman with a hairless pubic area), or a youthful and innocent girl's body.
