Cuphead: lips and neck
He loves how flustered you get.
Mugman: cheek and lips
He is so shy, so rarely does he make the first move. If he does, it's one of those two places and those places only.
Devil: anywhere and everywhere
This one is self explanatory.
King Dice: knuckles and forehead
He is super tall, and he is also a gentleman. He loves treating you like a princess.