Becoming a demon lord, go back to earth, realize it's been invaded many times by gates from other worlds, you don't want this to happen, you connect your world to earth, invade earth and help its people.
You have five personalities inside your body, your power that helped you reach the top is dying and automatically generate a new body near the dead body, thus whenever you die you resurrect and go by this, you developed a habit of collecting your dead bodies as trophies and done some questionable actions with it.
So each new body generated after you die, you chose a different clothing to wear to store in your collection after death later.
Any damage given to your collection will invite your anger and drive you to berserk, killing anyone responsible even for a slight slash.
You loved your spare/dead bodies as you also fixed them, not only can you and your other personality take over the bodies, one of your personalities created a magic that genderbent your spares and current body, thus this conventional foreplay transcended its unique clarity.