To dream that you are sucking on something, indicates that you need some TLC.

You are expressing a desire to escape from your daily responsibilities and be taken care of.

Alternatively, it may represent low self-esteem.

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.