Oftentimes the most visible parts of the body are overlooked, although some of them have a rich erotic potential. For example, the ears...
Pleasure your partner’s hearing: whisper that you want him/her, tell her what you want to do. Kiss, bite the earlobes lightly. Lick gently, try to stick your tongue deeper. Pay attention to the area behind the ear –– this is where touching with tongue is especially pleasant.
It is important to start the practice gently, tactfully — such caressing is not to everyone's liking. Afterwards, ask about how it felt, whether they would like to repeat it again or not. Do it again if they liked it!