秘
=
必
+
禾
:
Khubilai Khan (必) enslaved Marilyn Monroe (mi) and now she has to serve as his secretary (秘). She has to bring him his cereals (禾) every morning into the space station's bathroom (Ø4), because Khubilai cannot do his poo-poo before he had his cereals.
密
=
宀
+
必
+
山
:
Marilyn Monroe (mi) is secretly (密) making out with her secretary (密) Khubilai Khan (必). Because it has to be a secret (密), they meet in the space station's bathroom (Ø4) and hide under a huge graduation cap (宀). Just to be sure Khubilai Khan has two forks (山) in his hands to attack anyone who might enter and see them.