The purpose of this exploratory study is to develop a deeper understanding of the way in which the metaphorical language of therapists evolves in dialogue with a client over the course of a therapeutic session. We first briefly report on a study in which we categorized the metaphors used by therapists in twelve therapy sessions with a role-played client. Then we focus on an intensive micro-analysis of one particular metaphor that was introduced in the session by one particular therapist in the categorization study: the metaphor of a fireman in the family. Our analysis allowed us a detailed look at some of the ways in which metaphorical language opens dialogical space in the session to talk about the position of parentification of the client and about the price she has to pay for this position in terms of preoccupying worries and loneliness. Furthermore our analysis revealed the delicate dialogical nature of the therapeutic process in which, in talk, the therapist takes the client’s experiencing into account all the time.