heheh.i sent two ideas.
Oxygen Depriving Kiss - a big red pair of lips(intended to be the lips of the attacking monstergirl) kiss the target(and the screen.XD) for a long period of time but taking their oxygen away and suffocating them for a decent amount of damage leaving a big-mark as the kiss ends.
Big Wet Smooches - Multiple pink pairs of lips appear and begin kissing the screen rapidly leaving marks, not doing damage but leaving the victim with an arousal status or whatever.