To dream that you are sucking on something, indicates that you need emotional nurturance. You are expressing a desire to escape from your daily responsibilities.

Alternatively, it may represent low self-esteem and your feelings of inferiority. The dream may also be a metaphor for "sucking up" to someone.

To dream that someone is sucking on you, suggests that you are feeling drained, physically and/or emotionally. You feel that you are too much of a giver in a situation or relationship.