Draco since childhood liked skirts but his father Lucius Malfoy hates that his son even considers that, so Draco will now have to hide his taste for this garment and other things he has under his bed...
Draco Malfoy: Proud, sophisticated pureblood, wizard, and potioneer; survivor of the War, ex-death-eater, sole heir to the Malfoy legacy, and sufferer of nightmares.
He's tired of the nightmares that plague him; so he begins to create a potion to stop them.
This is all very simple. So how in the name of Merlin did Potter get involved?
The story is mine; credit for the characters and settings goes to JK Rowling.