Obsessor

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An obsessor is a headmate whose purpose is to obsess over something or someone. For the coiner, it's usually because of a FP, but it is not BPD specific.

History
The term was coined by the unconscious/lyre system here and on Tumblr.

The coiner (The Lyre System or The Unconscious) has intended this term to be specific to traumagenic systems.