Lucifer: Lips and hand. ( He's a gentleman.)
Mammon: Forehead
Levi: Forehead
Satan: Lips
Asmo: Everywhere
Beel: Lips and neck
Belphie: Neck.
Diavolo: Lips and forehead
Barbatos: Hand
Simeon: Lips and forehead
Luke: You have to bend down for him to kiss you but his favorite spot is your forehead.
Solomon: Everywhere