I thinking about 2 new idea :
1) Panty -.-"
Now girls have a chance to drop bra when defeat. I thinking about they have small chance to drop panty too.
Bra = restore HP
Panty = Increase Atk Power for short period of time +Atk 20-50% / 15-30 sec depend on how sexy of panty ( Hentai Power UP !!! )
2) Add +1 special support skill for each demon girl.
Press down+support button and consume 1 special gauge. So each demon girl will have 2 skill. for example Succubus
1.) Whip Combo (Normal)
2.) Dark Heart (Special) - Cheer her boss with her love. Increase Atk Power for Player and Stun all enemies around. (Benefit in boss fight - panty not drop in boss fight)
Each Support skill will have different cooldown depend on it power. Whip - 40 sec Dark Heart - 60+ sec. So some skill of demon girl may not powerful but exchange for speed cooldown. So you can use variety of skill as you like and match for each situation.