the third person in a triad poly relationship who is 'adopted' by a couple to be taken care of and spoiled by the 'parent' or core relationship

a puppy is usually bottom-leaning while the core couple is top-leaning or switch
Morgan is the puppy in their relationship, they take good care of him.

They spoil him too much, he's such a puppy.
by stretchyfletchy April 28, 2021
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